[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Averbakh, Yuri"]
[Black "Stein, Leonid"]
[Result "1/2-1/2"]
[ECO "B39"]
[EventDate "1965.03.19"]
[PlyCount "61"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. c4 Bg7 6. Be3 Nf6 7. Nc3 Ng4 8. Qxg4 Nxd4 9. Qd1 Ne6 10. Qd2 d6 11. Be2 Qa5 12. Rc1 Bd7 13. O-O Nc5 14. f3 Na4 15. Nxa4 Qxd2 16. Bxd2 Bxa4 17. Bc3 O-O 18. Bxg7 Kxg7 19. b3 Bc6 20. c5 dxc5 21. Rxc5 Rfd8 22. Rfc1 Rd2 23. R1c2 Rad8 24. Kf2 Rxc2 25. Rxc2 Rd4 26. Ke3 e5 27. Rc5 f6 28. Bb5 Bxb5 29. Rxb5 Rd7 30. Rc5 Kf7 31. Rc8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Bielicki, Carlos"]
[Black "Behrensen, Jorge"]
[Result "1-0"]
[ECO "D94"]
[EventDate "1965.03.19"]
[PlyCount "73"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. b4 a5 7. b5 Bg4 8. Bb2 Re8 9. cxd5 Nxd5 10. Bc4 Be6 11. Qb3 c6 12. Ng5 Nd7 13. e4 a4 14. Nxe6 fxe6 15. Nxa4 Qa5+ 16. Nc3 Nc5 17. dxc5 Nxc3 18. O-O Nxe4 19. Bxe6+ Kh8 20. Bxg7+ Kxg7 21. Rfe1 Nf6 22. Bf7 Rf8 23. Rxe7 Qd2 24. Rd1 Qf4 25. g3 Qg5 26. Rxb7 Qxc5 27. Bd5+ Kh8 28. Bxc6 Ra3 29. Qb2 Rc3 30. Qd2 Rc2 31. Qd4 Qf5 32. Rf1 Rxa2 33. Qc3 Rc2 34. Qa3 Rc5 35. Qa1 h5 36. Qe1 h4 37. Qe7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Bolbochan, Julio"]
[Black "Pilnik, Herman"]
[Result "1-0"]
[ECO "D60"]
[EventDate "1965.03.19"]
[PlyCount "83"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 Be7 5. Bg5 h6 6. Bh4 c6 7. e3 Nbd7 8. Bd3 O-O 9. O-O Ne8 10. Bg3 Bd6 11. e4 Bxg3 12. hxg3 dxe4 13. Bxe4 Nef6 14. Bc2 c5 15. dxc5 Nxc5 16. b4 Ncd7 17. c5 a6 18. Qd6 Nb8 19. Qf4 Nc6 20. Rad1 Qe7 21. Rfe1 a5 22. a3 axb4 23. axb4 Ra3 24. Ne4 Nd5 25. Qc1 Ncxb4 26. Bb1 Ra8 27. Ne5 Nc6 28. Nd6 Nxe5 29. Rxe5 Qf6 30. f4 g6 31. Be4 Ne7 32. Nxb7 Rb8 33. Nd6 Rb3 34. Bf3 Nf5 35. Nxf5 gxf5 36. c6 Qe7 37. c7 Qb4 38. Qc5 Qxc5+ 39. Rxc5 Kg7 40. Rd8 Rb2 41. Rc1 e5 42. fxe5 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Cruz, Raul Ceferino"]
[Black "Benko, Pal"]
[Result "0-1"]
[ECO "E98"]
[EventDate "1965.03.19"]
[PlyCount "74"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Nf3 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1 Ne8 10. Nd3 f5 11. exf5 gxf5 12. f4 e4 13. Nf2 c5 14. dxc6 bxc6 15. Be3 Ng6 16. Qa4 Bd7 17. Rfd1 Qb8 18. Rd2 Rf7 19. g3 a5 20. Qd1 Be6 21. Rc1 Qc7 22. Nh3 h6 23. Bh5 Kh7 24. b3 Rd8 25. Ne2 Nf6 26. Nd4 Bc8 27. Nf2 Rff8 28. Kh1 Ne7 29. Be2 Qb7 30. h3 Ne8 31. Kh2 Nc7 32. g4 c5 33. Nc2 Qc6 34. Nh1 d5 35. cxd5 Ncxd5 36. Qf1 Nxe3 37. Nxe3 Rxd2 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Foguelman, Alberto"]
[Black "Najdorf, Miguel"]
[Result "0-1"]
[ECO "E90"]
[EventDate "1965.03.19"]
[PlyCount "78"]

1. d4 Nf6 2. c4 c5 3. d5 g6 4. Nc3 Bg7 5. Nf3 d6 6. e4 O-O 7. h3 a6 8. Be3 Qa5 9. Bd3 b5 10. O-O bxc4 11. Bxc4 Nbd7 12. Nd2 Qc7 13. f4 Nb6 14. Re1 Rb8 15. Bf1 e6 16. dxe6 fxe6 17. Bf2 Nh5 18. g3 Bd4 19. Nf3 e5 20. Nxd4 cxd4 21. Ne2 Nd7 22. b3 Nc5 23. Bg2 Bb7 24. Nc1 Nf6 25. Qc2 Rbc8 26. Qb1 exf4 27. gxf4 Nfxe4 28. Rxe4 Qc6 29. Ne2 Nxe4 30. Nxd4 Qe8 31. Be3 Nc3 32. Qd3 Bxg2 33. Kxg2 Nd5 34. Bd2 Nxf4+ 35. Bxf4 Rxf4 36. Nf3 Qc6 37. Kg3 Rcf8 38. Nd4 Qd5 39. Rd1 Qg5+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Gheorghiu, Florin"]
[Black "Sanguineti, Raul"]
[Result "1/2-1/2"]
[ECO "E20"]
[EventDate "1965.03.19"]
[PlyCount "44"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 c5 5. a3 cxd4 6. axb4 dxc3 7. bxc3 d5 8. cxd5 exd5 9. Bf4 Be6 10. e3 O-O 11. Bd3 Nh5 12. Bxb8 Rxb8 13. Ne2 Re8 14. Qd2 Bd7 15. Kf2 a6 16. Ra5 Re5 17. g3 Nf6 18. Re1 Qe7 19. Nd4 Re8 20. Raa1 Rh5 21. Kg1 Re5 22. Kf2 Rh5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Palermo, Vicente"]
[Black "Rossetto, Hector Decio"]
[Result "0-1"]
[ECO "B08"]
[EventDate "1965.03.19"]
[PlyCount "86"]

1. e4 Nc6 2. Nf3 g6 3. d4 d6 4. Be2 Nf6 5. Nc3 Bg7 6. O-O O-O 7. d5 Nb8 8. Bg5 h6 9. Be3 e5 10. dxe6 Bxe6 11. Nd4 Bd7 12. Qd2 Nc6 13. Nxc6 Bxc6 14. f3 Kh7 15. Bc4 a6 16. a4 Qe7 17. Rfe1 Rae8 18. Bd4 Nh5 19. Bxg7 Kxg7 20. b4 Qe5 21. Bd5 Qf4 22. Qd4+ Qe5 23. Qxe5+ Rxe5 24. b5 Bxd5 25. Nxd5 c6 26. bxc6 bxc6 27. Nb4 Rc5 28. a5 Ra8 29. Red1 d5 30. exd5 cxd5 31. Rxd5 Rc4 32. c3 Rxc3 33. Rd6 Rb8 34. Rb1 Rb5 35. Rxa6 Nf4 36. Rb6 Rxa5 37. Rb2 h5 38. g3 Ne6 39. Kg2 Raa3 40. Nc2 Ra5 41. Rd6 Ra4 42. Nb4 h4 43. Rc6 Rxb4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.19"]
[Round "1"]
[White "Panno, Oscar"]
[Black "Garcia, Raimundo"]
[Result "1-0"]
[ECO "D78"]
[EventDate "1965.03.19"]
[PlyCount "113"]

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c6 6. d4 d5 7. Qb3 dxc4 8. Qxc4 Qd5 9. Qb4 Qd8 10. Nc3 Na6 11. Qa3 Qd6 12. Qb3 Qb4 13. Qc2 Qa5 14. a3 Qh5 15. e4 Bh3 16. Ne2 Bxg2 17. Kxg2 Rad8 18. h3 Qb5 19. b4 Rfe8 20. Rb1 Nb8 21. a4 Qa6 22. Bf4 Nbd7 23. b5 cxb5 24. axb5 Qa5 25. Bd2 Qb6 26. Rfc1 h6 27. Nc3 Nf8 28. Be3 Rc8 29. e5 N6d7 30. Qa2 Qe6 31. Qxa7 Qf5 32. Qa2 Nb6 33. g4 Qd3 34. Qd2 Qxd2 35. Nxd2 Nc4 36. Nxc4 Rxc4 37. Nd5 Rxc1 38. Rxc1 e6 39. Nb6 f6 40. f4 g5 41. Rc7 gxf4 42. Bxf4 Ng6 43. Bg3 Re7 44. Rxe7 Nxe7 45. Kf3 fxe5 46. dxe5 h5 47. Ke4 hxg4 48. hxg4 Bf8 49. Bf2 Bh6 50. Bc5 Bg5 51. Be3 Bh4 52. Kd4 Bg3 53. Ke4 Bh4 54. Bd4 Be1 55. Na4 Kf7 56. Nc5 b6 57. Na4 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Averbakh, Yuri"]
[Black "Palermo, Vicente"]
[Result "1-0"]
[ECO "A81"]
[EventDate "1965.03.19"]
[PlyCount "69"]

1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nc3 Bg7 5. e4 fxe4 6. Nxe4 Nc6 7. Nxf6+ exf6 8. Ne2 O-O 9. O-O f5 10. c3 d5 11. Nf4 Ne7 12. Re1 c6 13. Nd3 h6 14. b3 Kh7 15. Ba3 Bf6 16. Qc2 Bd7 17. Re3 Re8 18. Rae1 Ng8 19. Rxe8 Bxe8 20. h4 h5 21. Nc5 Qc8 22. Ne6 Bf7 23. Ng5+ Kg7 24. Bd6 Qd7 25. Be5 Rc8 26. Qd2 c5 27. dxc5 Rxc5 28. Qd4 b6 29. c4 Qe7 30. Nxf7 Qxf7 31. Bxd5 Qe7 32. b4 Rc8 33. Bxg8 Kxg8 34. Qd5+ Kh7 35. Bc3 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Behrensen, Jorge"]
[Black "Cruz, Raul Ceferino"]
[Result "1/2-1/2"]
[ECO "A12"]
[EventDate "1965.03.19"]
[PlyCount "80"]

1. Nf3 d5 2. g3 c6 3. Bg2 Bg4 4. c4 e6 5. O-O Nd7 6. b3 Ngf6 7. Bb2 Be7 8. d3 O-O 9. Nbd2 Re8 10. Qc2 Bf8 11. h3 Bxf3 12. exf3 e5 13. Rfe1 Qb6 14. Re2 Bc5 15. Rae1 Bd4 16. Nf1 dxc4 17. dxc4 Nc5 18. Bc1 Ne6 19. h4 Rad8 20. Bh3 Nc5 21. Bg5 Rd6 22. Ne3 g6 23. Bxf6 Rxf6 24. Kg2 h5 25. Nf1 Rd6 26. Nd2 f5 27. a3 Ne6 28. b4 c5 29. Nb3 Qc7 30. bxc5 Nxc5 31. Nxc5 Qxc5 32. g4 fxg4 33. fxg4 Rf8 34. gxh5 Rdf6 35. f3 gxh5 36. Kh2 Kh8 37. Rg2 Be3 38. Kh1 Bf4 39. Qe4 Qa5 40. Reg1 Qc7 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Benko, Pal"]
[Black "Bolbochan, Julio"]
[Result "1/2-1/2"]
[ECO "A25"]
[EventDate "1965.03.19"]
[PlyCount "47"]

1. c4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. e3 Nge7 6. Nge2 O-O 7. O-O d6 8. d4 exd4 9. exd4 Bg4 10. h3 Bxe2 11. Nxe2 d5 12. cxd5 Nxd5 13. Qb3 Nb6 14. Be3 Rb8 15. Rfd1 Na5 16. Qc2 Nac4 17. Bf4 Re8 18. a4 Qe7 19. Nc3 Qb4 20. Bxc7 Rbc8 21. Bxb6 Qxb6 22. Nd5 Qxb2 23. Qd3 Nd6 24. Rab1 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Najdorf, Miguel"]
[Black "Gheorghiu, Florin"]
[Result "1-0"]
[ECO "D27"]
[EventDate "1965.03.19"]
[PlyCount "43"]

1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. e3 d5 5. Nc3 dxc4 6. Bxc4 a6 7. a4 Nc6 8. O-O cxd4 9. exd4 Be7 10. Re1 O-O 11. Bg5 Bd7 12. Qe2 Rc8 13. Rad1 Nd5 14. Bxd5 Bxg5 15. Be4 Bh6 16. d5 exd5 17. Rxd5 Rc7 18. Rd6 f5 19. Bc2 Kh8 20. Nd5 Rc8 21. Qd1 g6 22. Ne7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Pilnik, Herman"]
[Black "Foguelman, Alberto"]
[Result "1-0"]
[ECO "B19"]
[EventDate "1965.03.19"]
[PlyCount "73"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. h4 h6 7. Nf3 Nd7 8. Bd3 Bxd3 9. Qxd3 Ngf6 10. Bf4 e6 11. O-O-O Nb6 12. c4 Be7 13. Kb1 Nc8 14. Qe2 b5 15. Ne5 Qb6 16. Nh5 Rg8 17. Bxh6 gxh6 18. Qf3 bxc4 19. Nxf6+ Bxf6 20. Qxf6 Nd6 21. Rhe1 Rb8 22. Re2 Rb7 23. Nxf7 Nxf7 24. Rxe6+ Kf8 25. d5 Rg6 26. Qc3 Rxg2 27. Rxc6 Qd8 28. Qf3 Qb8 29. Qa3+ Kg7 30. d6 Ne5 31. Rc5 Qf8 32. Rxe5 Qxf2 33. Re7+ Kg6 34. h5+ Kxh5 35. Qh3+ Kg5 36. Rd5+ Kf6 37. Qe6# 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Rossetto, Hector Decio"]
[Black "Bielicki, Carlos"]
[Result "1/2-1/2"]
[ECO "B50"]
[EventDate "1965.03.19"]
[PlyCount "57"]

1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Bd3 Bg4 5. h3 Bh5 6. Bc2 Nc6 7. d3 e6 8. Nbd2 Be7 9. Qe2 d5 10. g4 Bg6 11. Nh4 Qc7 12. Ndf3 Rd8 13. Bd2 c4 14. Nxg6 cxd3 15. Bxd3 hxg6 16. O-O-O dxe4 17. Bxe4 Nxe4 18. Qxe4 Qa5 19. Kb1 Qd5 20. Qxd5 Rxd5 21. Kc2 Bc5 22. Be3 Rxd1 23. Kxd1 Bxe3 24. fxe3 Ke7 25. Ke2 f6 26. a4 e5 27. Kf2 f5 28. Kg3 Rd8 29. Kf2 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Sanguineti, Raul"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]
[ECO "B83"]
[EventDate "1965.03.19"]
[PlyCount "69"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 Be7 7. O-O O-O 8. f4 Nc6 9. Be3 Bd7 10. Kh1 Nxd4 11. Bxd4 Bc6 12. Bf3 Nd7 13. Qe2 e5 14. Be3 exf4 15. Bxf4 Qb6 16. Rab1 Rfd8 17. Rfd1 Nf6 18. Rd3 Ne8 19. Nd5 Bxd5 20. exd5 Bf6 21. c3 g6 22. Re1 Ng7 23. Qd2 Re8 24. Rde3 Rxe3 25. Rxe3 Re8 26. Rxe8+ Nxe8 27. Qe3 Qxe3 28. Bxe3 b6 29. a4 Kf8 30. Kg1 Bd8 31. Kf2 Nf6 32. Bg5 Ne4+ 33. Bxe4 Bxg5 34. Ke2 f5 35. Bf3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.20"]
[Round "2"]
[White "Stein, Leonid"]
[Black "Garcia, Raimundo"]
[Result "1/2-1/2"]
[ECO "B45"]
[EventDate "1965.03.19"]
[PlyCount "72"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. exd5 exd5 10. Bd3 d4 11. Ne2 O-O 12. O-O a6 13. Ng3 Bg4 14. f3 Be6 15. Re1 Re8 16. Ne4 Nxe4 17. Rxe4 Bd5 18. Rxe8+ Qxe8 19. Bf4 Qe6 20. Qe1 Re8 21. Qxe6 Rxe6 22. Kf2 g6 23. Rd1 f6 24. Bf1 Re7 25. Bd6 Rd7 26. Bc5 Be6 27. a4 Kg7 28. b4 Rd5 29. Re1 Bf7 30. Rb1 g5 31. Ke1 Bg6 32. Kd2 Ne5 33. Rb3 Be8 34. Ra3 d3 35. Ra1 Bg6 36. cxd3 Nxd3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Averbakh, Yuri"]
[Black "Cruz, Raul Ceferino"]
[Result "1-0"]
[ECO "D36"]
[EventDate "1965.03.19"]
[PlyCount "45"]

1. c4 Nf6 2. d4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 Be7 6. e3 O-O 7. Bd3 c6 8. Qc2 Nbd7 9. Nge2 Re8 10. O-O Nf8 11. f3 Ng6 12. e4 dxe4 13. fxe4 Ng4 14. Bxe7 Qxe7 15. Qd2 Be6 16. h3 Nf6 17. e5 Nd5 18. Ne4 Qb4 19. Qc1 Ngf4 20. Rxf4 Nxf4 21. Qxf4 Bc4 22. Bxc4 Qxc4 23. Nd6 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Behrensen, Jorge"]
[Black "Foguelman, Alberto"]
[Result "1-0"]
[ECO "E66"]
[EventDate "1965.03.19"]
[PlyCount "79"]

1. d4 Nf6 2. c4 g6 3. Nc3 c5 4. Nf3 Bg7 5. g3 O-O 6. Bg2 Nc6 7. O-O d6 8. d5 Na5 9. Nd2 Rb8 10. Qc2 a6 11. b3 e5 12. a3 b5 13. cxb5 axb5 14. b4 cxb4 15. axb4 Nc4 16. Nb3 Bf5 17. e4 Bd7 18. Bg5 Qb6 19. Na5 Rfc8 20. Rfc1 Ng4 21. h3 f6 22. hxg4 fxg5 23. Nc6 Bxc6 24. dxc6 Qxc6 25. Bf1 Qd7 26. Nxb5 d5 27. Na7 Rc7 28. exd5 Rxb4 29. Nc6 Nb6 30. Ne7+ Qxe7 31. Qxc7 Qxc7 32. Rxc7 Bf8 33. Rd1 Bd6 34. Rc6 Bb8 35. d6 Nd7 36. Bc4+ Kg7 37. Be6 Rb7 38. Bxd7 Rxd7 39. Rc8 Rxd6 40. Rb1 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Benko, Pal"]
[Black "Gheorghiu, Florin"]
[Result "1/2-1/2"]
[ECO "D23"]
[EventDate "1965.03.19"]
[PlyCount "53"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Qa4+ c6 5. Qxc4 Bf5 6. g3 e6 7. Bg2 Nbd7 8. O-O Be7 9. Nc3 O-O 10. Re1 Ne4 11. Qb3 Qb6 12. Nh4 Bxh4 13. Nxe4 Bxe4 14. Bxe4 Bf6 15. Qc2 Bxd4 16. Bxh7+ Kh8 17. e3 Bf6 18. Bd3 Nc5 19. Be2 Rad8 20. Rb1 Qb4 21. Kf1 Qe4 22. Qxe4 Nxe4 23. Bf3 Nd2+ 24. Bxd2 Rxd2 25. Re2 Rfd8 26. Ke1 Rxe2+ 27. Kxe2 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Najdorf, Miguel"]
[Black "Garcia, Raimundo"]
[Result "1-0"]
[ECO "A75"]
[EventDate "1965.03.19"]
[PlyCount "107"]

1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nc3 exd5 5. cxd5 g6 6. e4 d6 7. Nf3 Bg7 8. Be2 O-O 9. O-O Re8 10. Qc2 a6 11. a4 Bg4 12. Bf4 Qc7 13. h3 Bxf3 14. Bxf3 Nbd7 15. Rfe1 c4 16. Be2 Rac8 17. Rac1 Rb8 18. Bf1 b5 19. axb5 axb5 20. b4 Nh5 21. Bd2 Qb7 22. g4 Nhf6 23. f4 Ra8 24. Bg2 Ra3 25. Re2 h5 26. g5 Nh7 27. Kh1 Rea8 28. Rce1 Qb8 29. e5 Nxe5 30. fxe5 Bxe5 31. Rxe5 dxe5 32. Ne4 Ra2 33. Qd1 R8a3 34. Bc3 Nxg5 35. Nf6+ Kg7 36. Bxe5 Qxe5 37. Rxe5 Ra1 38. Ne8+ Kf8 39. Qe1 Rxe1+ 40. Rxe1 c3 41. Nc7 c2 42. Rc1 Nxh3 43. Rxc2 Nf4 44. Nxb5 Rd3 45. Nc3 Nxg2 46. Kxg2 Rd4 47. b5 Ke7 48. Kf3 Kd7 49. Ke3 Rb4 50. Ra2 h4 51. Ra7+ Ke8 52. Ne4 f5 53. Nf6+ Kf8 54. d6 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Palermo, Vicente"]
[Black "Bielicki, Carlos"]
[Result "1/2-1/2"]
[ECO "E24"]
[EventDate "1965.03.19"]
[PlyCount "96"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 b6 6. f3 Nc6 7. e4 Ba6 8. Bg5 Na5 9. Qa4 h6 10. Be3 Qc8 11. Nh3 Qb7 12. d5 e5 13. Rc1 c6 14. Nf2 O-O 15. Bd3 d6 16. O-O Rac8 17. Rfd1 c5 18. f4 Qd7 19. Qc2 Bxc4 20. fxe5 dxe5 21. Qe2 Bxd3 22. Rxd3 c4 23. Rdd1 Nb3 24. Rb1 Nh7 25. Ng4 f6 26. h4 Na5 27. Rb4 Nb7 28. d6 Kh8 29. Rb2 Rc6 30. Rbd2 Rxd6 31. Rxd6 Nxd6 32. Rd5 Qe6 33. Qf3 Nf7 34. Qd1 Qe7 35. a4 Rd8 36. a5 bxa5 37. Qa4 Rxd5 38. exd5 f5 39. Nf2 f4 40. Bxa7 Nd6 41. Bc5 Qe8 42. Qxa5 Nb7 43. Qc7 Nxc5 44. Qxc5 Nf6 45. Qxc4 Qd7 46. Nd3 Qxd5 47. Qxd5 Nxd5 48. Nxe5 Nxc3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Pilnik, Herman"]
[Black "Panno, Oscar"]
[Result "0-1"]
[ECO "C95"]
[EventDate "1965.03.19"]
[PlyCount "56"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d4 Nbd7 11. c4 c6 12. c5 Qc7 13. cxd6 Bxd6 14. Bg5 exd4 15. Bxf6 gxf6 16. Nxd4 Nc5 17. Nf5 Bxf5 18. exf5 Rad8 19. Qg4+ Kh8 20. Qh4 Be5 21. Nc3 Rfe8 22. Re3 Rg8 23. Rd1 Nxb3 24. Rde1 Nd4 25. Qe4 b4 26. Ne2 c5 27. Ng3 Qc6 28. Qb1 Bf4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Rossetto, Hector Decio"]
[Black "Bolbochan, Julio"]
[Result "1/2-1/2"]
[ECO "B80"]
[EventDate "1965.03.19"]
[PlyCount "100"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be3 a6 7. g3 b5 8. Bg2 Bb7 9. a3 Nbd7 10. O-O Qc7 11. Qe2 Be7 12. Rad1 O-O 13. f4 g6 14. Bc1 Rfe8 15. Kh1 Rac8 16. Nf3 Qc4 17. Qxc4 Rxc4 18. Nd2 Rc7 19. Nb3 Nb6 20. Na5 Ba8 21. Be3 Nc4 22. Nxc4 Rxc4 23. Rd4 Rec8 24. Rfd1 e5 25. Rxc4 Rxc4 26. fxe5 dxe5 27. Bg5 Kg7 28. Bxf6+ Kxf6 29. Rd3 Bc6 30. Bf3 a5 31. Nd5+ Bxd5 32. Rxd5 b4 33. axb4 axb4 34. Rd2 h5 35. Kg2 Bc5 36. Kf1 Bd4 37. Be2 Rc7 38. b3 Rc3 39. Bd3 Kg5 40. h4+ Kf6 41. Rd1 Ke7 42. Kg2 Rc8 43. Rf1 Rf8 44. Kh3 Bc3 45. g4 hxg4+ 46. Kxg4 Rh8 47. Rh1 Rh5 48. Rf1 Bd4 49. Rf3 Bc5 50. Rf5 Rxh4+ 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.21"]
[Round "3"]
[White "Stein, Leonid"]
[Black "Sanguineti, Raul"]
[Result "1-0"]
[ECO "A13"]
[EventDate "1965.03.19"]
[PlyCount "59"]

1. c4 e6 2. Nc3 Bb4 3. a3 Bxc3 4. bxc3 f5 5. g3 Nf6 6. Bg2 O-O 7. d3 d6 8. Nf3 Bd7 9. c5 Na6 10. cxd6 cxd6 11. O-O Nc5 12. Rb1 Bc6 13. c4 Qe8 14. Bb2 Qh5 15. Bxf6 Rxf6 16. d4 Rh6 17. h3 Ne4 18. d5 exd5 19. cxd5 Bd7 20. Rxb7 Qe8 21. Qd4 Nc5 22. Rb2 Qh5 23. Rfb1 Rf8 24. Rb8 Rhf6 25. Rxf8+ Rxf8 26. Qf4 Qg6 27. Nd4 Qf6 28. Ne6 Nxe6 29. dxe6 Qxe6 30. Rb7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Bielicki, Carlos"]
[Black "Averbakh, Yuri"]
[Result "1/2-1/2"]
[ECO "D40"]
[EventDate "1965.03.19"]
[PlyCount "81"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. e3 Nc6 6. a3 cxd4 7. exd4 Be7 8. Bd3 dxc4 9. Bxc4 O-O 10. O-O b6 11. d5 Na5 12. Ba2 Nxd5 13. Nxd5 exd5 14. Bxd5 Bb7 15. Bxb7 Nxb7 16. Bf4 Nc5 17. Be5 Qxd1 18. Raxd1 Rfd8 19. Nd4 Bf8 20. Nf3 Rac8 21. Rxd8 Rxd8 22. Bd4 f6 23. g3 Kf7 24. Rc1 Rd7 25. Rc2 a5 26. Kf1 Nb3 27. Be3 Bc5 28. Bxc5 Nxc5 29. b4 Ne6 30. Ke2 Ke7 31. h4 Rd5 32. Rd2 Kd6 33. Rc2 h5 34. Rc4 g5 35. hxg5 fxg5 36. Ke3 g4 37. Nd2 axb4 38. axb4 Re5+ 39. Kd3 Rd5+ 40. Ke3 Re5+ 41. Kd3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Bolbochan, Julio"]
[Black "Behrensen, Jorge"]
[Result "1/2-1/2"]
[ECO "E59"]
[EventDate "1965.03.19"]
[PlyCount "76"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 O-O 6. Bd3 Nc6 7. O-O d5 8. a3 Bxc3 9. bxc3 dxc4 10. Bxc4 Qc7 11. Bb5 Rd8 12. Qc2 a6 13. Be2 e5 14. dxe5 Nxe5 15. Ne1 c4 16. f3 Be6 17. e4 Qc5+ 18. Kh1 Rac8 19. g4 Nd3 20. Ng2 Nxc1 21. Qxc1 Rc6 22. Qe3 Qa5 23. g5 Nd7 24. Rfd1 Nc5 25. Rxd8+ Qxd8 26. Rd1 Rd6 27. Rxd6 Qxd6 28. e5 Qe7 29. Ne1 Nd7 30. Nc2 Bd5 31. Nb4 Be6 32. f4 a5 33. Nc2 Bd5+ 34. Bf3 Bxf3+ 35. Qxf3 Qc5 36. Kg2 b6 37. Qe4 Nf8 38. f5 g6 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Cruz, Raul Ceferino"]
[Black "Rossetto, Hector Decio"]
[Result "1-0"]
[ECO "D70"]
[EventDate "1965.03.19"]
[PlyCount "115"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nb6 6. Be3 Bg7 7. h3 O-O 8. Nf3 c6 9. Be2 Be6 10. O-O Bc4 11. b3 Bxe2 12. Qxe2 N8d7 13. Rfd1 e6 14. a4 a5 15. Bg5 Qb8 16. Qe3 Re8 17. Rac1 Qd6 18. Bh6 Qb4 19. Bxg7 Kxg7 20. Ne5 Rad8 21. Ng4 h5 22. Qh6+ Kg8 23. Nh2 Nf6 24. Nf3 Nh7 25. Qe3 Nd7 26. Ne2 Qb6 27. e5 Qb4 28. Ng3 Nb6 29. Ne4 Nd5 30. Qh6 Qf8 31. Qd2 Qb4 32. Qh6 Qf8 33. Qd2 Qb4 34. Qb2 Qf8 35. Rc5 Ra8 36. Qd2 Nb4 37. Nfg5 Red8 38. Nxh7 Kxh7 39. Nf6+ Kg7 40. Ne4 Qe7 41. Rc3 Rh8 42. Rf3 Rad8 43. Qc1 h4 44. Nd6 Rxd6 45. exd6 Qxd6 46. Qc3 Rh5 47. Re1 Kg8 48. Re5 Nd5 49. Qxa5 Rxe5 50. dxe5 Qxe5 51. Qd8+ Kg7 52. Qxh4 Qe1+ 53. Kh2 e5 54. Qg5 f6 55. Qg4 e4 56. Rg3 g5 57. h4 Qxf2 58. Qxe4 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Foguelman, Alberto"]
[Black "Benko, Pal"]
[Result "1/2-1/2"]
[ECO "A30"]
[EventDate "1965.03.19"]
[PlyCount "123"]

1. d4 Nf6 2. c4 g6 3. g3 c5 4. Nf3 Bg7 5. Bg2 Qa5+ 6. Nbd2 cxd4 7. Nxd4 Nc6 8. Nc2 O-O 9. O-O d6 10. Ne3 Qh5 11. Bf3 Ng4 12. Nxg4 Bxg4 13. Bxg4 Qxg4 14. Rb1 Rfc8 15. b3 d5 16. e3 Qxd1 17. Rxd1 dxc4 18. Nxc4 b5 19. Na3 a6 20. Bb2 Nb4 21. Bxg7 Kxg7 22. Rb2 Rd8 23. Ra1 Rac8 24. Kf1 e5 25. Ke2 e4 26. Rf1 f5 27. f3 exf3+ 28. Kxf3 Rd3 29. Ke2 Rcc3 30. Rf3 Rd6 31. h3 Nd3 32. Rc2 Nc1+ 33. Ke1 Rxc2 34. Nxc2 Nxa2 35. Nd4 Nb4 36. Kd2 Nc6 37. Rf4 Kf6 38. Kc3 Nxd4 39. exd4 Ke6 40. g4 fxg4 41. hxg4 h6 42. Rf8 a5 43. Ra8 Rd5 44. Ra6+ Kf7 45. Kd3 b4 46. Ke4 Rg5 47. Kf4 Ke7 48. Ra7+ Ke6 49. Rh7 Rd5 50. Ke4 Rg5 51. Kf4 Kf6 52. Rxh6 a4 53. bxa4 Rd5 54. Ke4 Ra5 55. Rh8 Rxa4 56. Rb8 Kg5 57. Rb6 Ra1 58. Rxb4 Kxg4 59. d5 Re1+ 60. Kd4 Kf5 61. Rb2 Rd1+ 62. Kc5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Garcia, Raimundo"]
[Black "Sanguineti, Raul"]
[Result "0-1"]
[ECO "A07"]
[EventDate "1965.03.19"]
[PlyCount "60"]

1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. O-O e5 5. d3 Nc6 6. Nbd2 Nf6 7. e4 O-O 8. exd5 Nxd5 9. Re1 Re8 10. c3 h6 11. a4 Rb8 12. a5 Bf5 13. Ne4 b6 14. axb6 axb6 15. b4 Be6 16. b5 Na5 17. Bb2 f5 18. Nc5 bxc5 19. Rxa5 e4 20. dxe4 fxe4 21. Rxe4 Nxc3 22. Qa1 Nxe4 23. Bxg7 Kh7 24. Ne5 Qd4 25. Qxd4 cxd4 26. Nc6 Kxg7 27. Nxb8 d3 28. Ra3 Nc5 29. Na6 d2 30. Ra1 Bg4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Gheorghiu, Florin"]
[Black "Pilnik, Herman"]
[Result "1/2-1/2"]
[ECO "D93"]
[EventDate "1965.03.19"]
[PlyCount "65"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 g6 5. Qb3 Bg7 6. Bf4 O-O 7. e3 Qa5 8. cxd5 Nxd5 9. Be5 Qb4 10. Bc4 Qxb3 11. Bxb3 Bxe5 12. Nxe5 Nb6 13. Ne4 Kg7 14. h4 h5 15. O-O N8d7 16. f4 Nd5 17. Nxd7 Bxd7 18. Nc5 Bc8 19. e4 Nf6 20. e5 Ng4 21. e6 b6 22. Ne4 f6 23. f5 Ne3 24. Rf4 Rd8 25. Ng3 a5 26. Re1 Nxf5 27. Rxf5 gxf5 28. Nxf5+ Kf8 29. a4 b5 30. g4 bxa4 31. Ba2 Rb8 32. gxh5 Rb5 33. Rf1 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Palermo, Vicente"]
[Black "Stein, Leonid"]
[Result "0-1"]
[ECO "E67"]
[EventDate "1965.03.19"]
[PlyCount "88"]

1. c4 g6 2. Nc3 Bg7 3. Nf3 Nf6 4. g3 O-O 5. Bg2 d6 6. O-O e5 7. d4 Nbd7 8. Qc2 exd4 9. Nxd4 Nb6 10. b3 c5 11. Ndb5 a6 12. Na3 Bf5 13. e4 Nxe4 14. Bxe4 Bxe4 15. Nxe4 Bxa1 16. Bg5 f6 17. Bh6 Be5 18. Bxf8 Qxf8 19. Nb1 Re8 20. Nec3 f5 21. Re1 Bd4 22. Rxe8 Qxe8 23. Qe2 Qxe2 24. Nxe2 Be5 25. f4 Bf6 26. Nbc3 Kf7 27. Kf2 Ke6 28. Ke3 d5 29. Kd3 Kd6 30. Nd1 dxc4+ 31. bxc4 Na4 32. Kc2 b5 33. Kb3 Nb6 34. cxb5 axb5 35. Ndc3 Bxc3 36. Nxc3 c4+ 37. Kc2 Kc5 38. Ne2 Nd5 39. a3 Ne3+ 40. Kc3 Ng4 41. Nd4 Nxh2 42. Ne6+ Kb6 43. Nf8 Nf1 44. Nxh7 Nxg3 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.23"]
[Round "4"]
[White "Panno, Oscar"]
[Black "Najdorf, Miguel"]
[Result "0-1"]
[ECO "A14"]
[EventDate "1965.03.19"]
[PlyCount "78"]

1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. O-O Be7 6. b3 O-O 7. Bb2 d5 8. e3 Nbd7 9. Nc3 a6 10. d4 Bd6 11. a4 Bb4 12. Na2 Be7 13. Qe2 c5 14. Rfd1 Qc7 15. Rac1 dxc4 16. bxc4 Rac8 17. Nc3 cxd4 18. exd4 Rfe8 19. Nb1 Bb4 20. Qe3 Bc6 21. Qb3 Bf8 22. Nc3 Ba8 23. Ne2 g6 24. Ne1 Bxg2 25. Nxg2 e5 26. Ne3 Bh6 27. dxe5 Nxe5 28. Bxe5 Rxe5 29. f4 Re4 30. Nd4 Qc5 31. Qd3 Bg7 32. Kg2 Rce8 33. Nec2 Ng4 34. h3 Ne3+ 35. Nxe3 Rxe3 36. Qd2 Bxd4 37. Qxd4 Re2+ 38. Kf1 Re1+ 39. Rxe1 Rxe1+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Bielicki, Carlos"]
[Black "Stein, Leonid"]
[Result "0-1"]
[ECO "A49"]
[EventDate "1965.03.19"]
[PlyCount "74"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d6 6. Nbd2 Nbd7 7. e4 e5 8. dxe5 dxe5 9. Qe2 b6 10. Rd1 a5 11. a4 Ba6 12. Nc4 Qe7 13. b3 Qe6 14. Bf1 Nc5 15. Ng5 Bxc4 16. Qe1 Qe7 17. Bxc4 h6 18. Nf3 Nfxe4 19. Bb2 c6 20. Nd2 Nd6 21. Bf1 e4 22. Bxg7 Kxg7 23. Nc4 Nxc4 24. Bxc4 Rad8 25. Qc3+ Qf6 26. Qxf6+ Kxf6 27. Kf1 Ke7 28. Ke2 f5 29. f3 Kf6 30. f4 g5 31. Ke3 Nb7 32. Rf1 Nd6 33. Be2 Nc8 34. g4 Ne7 35. fxg5+ hxg5 36. gxf5 Nxf5+ 37. Kf2 Ke5 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Bolbochan, Julio"]
[Black "Averbakh, Yuri"]
[Result "1/2-1/2"]
[ECO "A36"]
[EventDate "1965.03.19"]
[PlyCount "31"]

1. c4 c5 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. e3 e6 6. Nge2 Nge7 7. O-O O-O 8. d4 cxd4 9. exd4 d5 10. cxd5 Nxd5 11. Nxd5 exd5 12. Be3 Bg4 13. Qd2 Bxe2 14. Qxe2 Nxd4 15. Bxd4 Bxd4 16. Rad1 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Cruz, Raul Ceferino"]
[Black "Palermo, Vicente"]
[Result "0-1"]
[ECO "A81"]
[EventDate "1965.03.19"]
[PlyCount "50"]

1. d4 f5 2. g3 Nf6 3. Bg2 d6 4. Nc3 c6 5. e4 fxe4 6. Nxe4 Nxe4 7. Bxe4 Bf5 8. Qd3 Bxe4 9. Qxe4 Nd7 10. Bd2 Nf6 11. Qd3 e5 12. dxe5 dxe5 13. Qe2 Qd5 14. Nf3 O-O-O 15. c4 Qe4 16. Qxe4 Nxe4 17. Be3 Bc5 18. Ke2 Bd4 19. Rab1 Rhf8 20. Rhf1 Bxb2 21. Bg5 Nc3+ 22. Ke3 e4 23. Bxd8 Rxf3+ 24. Kd2 Nxb1+ 25. Rxb1 Bc3+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Foguelman, Alberto"]
[Black "Rossetto, Hector Decio"]
[Result "0-1"]
[ECO "B32"]
[EventDate "1965.03.19"]
[PlyCount "104"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 a6 6. Nd6+ Bxd6 7. Qxd6 Qf6 8. Qd1 Nge7 9. Nc3 Qg6 10. Be3 d5 11. Nxd5 Nxd5 12. Qxd5 Be6 13. Qd2 Qxe4 14. f3 Qa4 15. Bd3 O-O 16. a3 Nd4 17. O-O Rfd8 18. Qf2 Rac8 19. Rad1 Bf5 20. Bxf5 Nxf5 21. Bc5 h6 22. b3 Qc6 23. b4 Qg6 24. Rfe1 Kh7 25. a4 Rxd1 26. Rxd1 a5 27. c3 h5 28. g3 Qc6 29. g4 Qg6 30. Qg2 Rxc5 31. gxf5 Qxg2+ 32. Kxg2 Rxc3 33. bxa5 Rc4 34. Rd7 f6 35. Rxb7 Rxa4 36. Ra7 Kh6 37. a6 Kg5 38. Rxg7+ Kxf5 39. a7 Kf4 40. Rh7 Ra2+ 41. Kh3 Kxf3 42. Rf7 Ke4 43. Rxf6 Rxa7 44. Kh4 Kd3 45. Rf5 e4 46. Rd5+ Ke2 47. Rxh5 Rg7 48. Rh8 e3 49. Kh5 Re7 50. h4 Kf3 51. Rf8+ Kg2 52. Rg8+ Kh3 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Garcia, Raimundo"]
[Black "Pilnik, Herman"]
[Result "1-0"]
[ECO "D67"]
[EventDate "1965.03.19"]
[PlyCount "65"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 O-O 6. Nf3 Nbd7 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. Ne4 N5f6 12. Ng3 c5 13. O-O b6 14. e4 Bb7 15. d5 exd5 16. exd5 Ne5 17. d6 Nxf3+ 18. Qxf3 Qd7 19. Qf4 Rae8 20. Nf5 Be4 21. Ne7+ Kh8 22. Rfe1 Bg6 23. Rcd1 Rd8 24. h3 Qa4 25. b3 Qxa2 26. Nc6 Rc8 27. d7 Nxd7 28. Ne7 Rcd8 29. Qc7 a6 30. Rxd7 Rxd7 31. Qxd7 b5 32. Nxg6+ fxg6 33. Qf7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Gheorghiu, Florin"]
[Black "Behrensen, Jorge"]
[Result "1-0"]
[ECO "B67"]
[EventDate "1965.03.19"]
[PlyCount "53"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f4 h6 10. Bh4 Nxe4 11. Qe1 Nf6 12. Nf5 Qa5 13. Nxd6+ Bxd6 14. Rxd6 O-O-O 15. Rd1 Ne7 16. Nd5 Qxe1 17. Nxe7+ Kc7 18. Bxe1 Rde8 19. Bb4 Kd8 20. Nc6+ bxc6 21. Bxa6 Nd5 22. Bd6 Bc8 23. Be2 Kd7 24. Bc5 Kc7 25. c4 Nf6 26. Bd6+ Kd7 27. Bb8+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Panno, Oscar"]
[Black "Benko, Pal"]
[Result "1/2-1/2"]
[ECO "D35"]
[EventDate "1965.03.19"]
[PlyCount "68"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. cxd5 exd5 6. Bg5 c6 7. Qc2 g6 8. e3 Bf5 9. Bd3 Bxd3 10. Qxd3 Nbd7 11. Bh6 Ng4 12. Bf4 O-O 13. h3 Ngf6 14. O-O Re8 15. Bh2 Bf8 16. Nd2 Nb6 17. Rfd1 Bd6 18. Bxd6 Qxd6 19. a4 a5 20. Ra3 Re7 21. Rb3 Qc7 22. f3 Rd8 23. Rc1 Nbd7 24. Nd1 Rde8 25. Qc2 Nb8 26. Nf1 Na6 27. Nf2 Nb4 28. Qd2 Nd7 29. Nd3 Nxd3 30. Rxd3 Qb6 31. b4 Qxb4 32. Qxb4 axb4 33. Rb3 Ra8 34. Rxb4 Nf6 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.24"]
[Round "5"]
[White "Sanguineti, Raul"]
[Black "Najdorf, Miguel"]
[Result "1/2-1/2"]
[ECO "B88"]
[EventDate "1965.03.19"]
[PlyCount "81"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 Be7 8. f4 Nc6 9. O-O O-O 10. Kh1 Bd7 11. f5 Nxd4 12. Qxd4 Rc8 13. Qd3 exf5 14. exf5 Bc6 15. Bf4 Qa5 16. Rad1 Rfe8 17. h3 Bf8 18. Bxd6 Rcd8 19. Qg3 Rxd6 20. Rxd6 Nh5 21. Qd3 Bxd6 22. Qxd6 Rd8 23. Qe7 Ng3+ 24. Kg1 Nxf1 25. Bxf7+ Kh8 26. f6 Qb6+ 27. Kxf1 Bb5+ 28. Nxb5 Qxb5+ 29. Ke1 Qd7 30. Qxd7 Rxd7 31. Be8 Rd6 32. f7 Rf6 33. b4 g5 34. a4 Kg7 35. a5 g4 36. hxg4 Rf4 37. c3 Rxg4 38. Bd7 Rxg2 39. Bc8 Rc2 40. Bxb7 Rxc3 41. Bxa6 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Averbakh, Yuri"]
[Black "Foguelman, Alberto"]
[Result "1/2-1/2"]
[ECO "D35"]
[EventDate "1965.03.19"]
[PlyCount "80"]

1. c4 Nf6 2. Nc3 e6 3. d4 d5 4. cxd5 exd5 5. Bg5 Nbd7 6. e3 Be7 7. Nf3 O-O 8. Bd3 Re8 9. O-O Nf8 10. Qc2 g6 11. b4 Ne6 12. Bxf6 Bxf6 13. b5 Qd6 14. Rfc1 Bd7 15. Qb3 c6 16. Rab1 Reb8 17. Na4 g5 18. Nc5 Be8 19. a4 g4 20. Ne1 h5 21. Qc2 Be7 22. Be2 Ng5 23. bxc6 bxc6 24. Qf5 Kg7 25. Ned3 Qf6 26. Qxf6+ Bxf6 27. Nf4 Kh6 28. Ba6 Rxb1 29. Rxb1 Be7 30. Nfd3 Bd6 31. Bb7 Rd8 32. Na6 Ne4 33. Rc1 Ba3 34. Rc2 Nd6 35. Bxc6 Rc8 36. Ndb4 Bxb4 37. Nxb4 Rb8 38. Nd3 Rc8 39. Nb4 Rb8 40. Nd3 Rc8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Behrensen, Jorge"]
[Black "Panno, Oscar"]
[Result "0-1"]
[ECO "B83"]
[EventDate "1965.03.19"]
[PlyCount "78"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Be2 Be7 7. O-O O-O 8. Be3 Nc6 9. Kh1 Bd7 10. f4 Nxd4 11. Bxd4 Bc6 12. Qd3 Qa5 13. Qg3 g6 14. e5 Nd7 15. Bf3 Rac8 16. Rad1 Rfd8 17. Qe1 Bxf3 18. Rxf3 dxe5 19. fxe5 Bc5 20. Rfd3 Bxd4 21. Rxd4 Nb8 22. Rd6 Nc6 23. Qh4 Rf8 24. Ne4 Qxe5 25. Nf6+ Kg7 26. Nd7 Qxb2 27. Nxf8 Rxf8 28. Rf1 Kg8 29. Rd7 Qxc2 30. Qf6 Qe2 31. Rxb7 Ne5 32. h3 a6 33. a4 Qd3 34. Rfb1 Nd7 35. Qe7 Ne5 36. Qf6 Nd7 37. Qf2 Qd5 38. Rc7 Ne5 39. Rbb7 Qd1+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Benko, Pal"]
[Black "Garcia, Raimundo"]
[Result "1-0"]
[ECO "E61"]
[EventDate "1965.03.19"]
[PlyCount "79"]

1. c4 e5 2. Nc3 d6 3. g3 g6 4. d4 Nd7 5. Bg2 Bg7 6. e3 Ngf6 7. Nge2 O-O 8. O-O Re8 9. Qc2 c6 10. b4 exd4 11. Nxd4 Nb6 12. c5 dxc5 13. bxc5 Nbd7 14. Na4 Qe7 15. Bb2 Ne4 16. Rac1 f5 17. Rfe1 Ndf6 18. Ba1 Kh8 19. Nb2 Be6 20. Nxe6 Qxe6 21. Nd3 Rad8 22. Bd4 Qe7 23. Rb1 Nd5 24. Rb3 Rd7 25. Reb1 Kg8 26. a4 Ng5 27. Qb2 b6 28. Bxg7 Qxg7 29. Qxg7+ Rxg7 30. cxb6 axb6 31. Nb4 Nxb4 32. Rxb4 c5 33. Rxb6 Rc8 34. a5 c4 35. Rb7 Rgc7 36. a6 c3 37. a7 c2 38. Rc1 Rxb7 39. Bxb7 Rd8 40. Rxc2 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Bielicki, Carlos"]
[Black "Cruz, Raul Ceferino"]
[Result "0-1"]
[ECO "D27"]
[EventDate "1965.03.19"]
[PlyCount "92"]

1. d4 Nf6 2. c4 c5 3. e3 e6 4. Nc3 d5 5. Nf3 dxc4 6. Bxc4 a6 7. a4 Nc6 8. O-O Be7 9. Qd3 O-O 10. Rd1 cxd4 11. exd4 Bd7 12. Bg5 Nb4 13. Qe2 Bc6 14. Ne5 Bd5 15. Nxd5 Nfxd5 16. Bxe7 Qxe7 17. a5 Rac8 18. Ra3 Rc7 19. Rg3 Rd8 20. b3 Nc6 21. Nxc6 Rxc6 22. Qe5 g6 23. h3 Qc7 24. Qe1 Ne7 25. Rgd3 Rcd6 26. Qb4 Nc6 27. Qc5 Qxa5 28. Qxa5 Nxa5 29. d5 Nxc4 30. bxc4 b5 31. c5 Rxd5 32. Rxd5 exd5 33. Ra1 d4 34. Kf1 d3 35. Ke1 Rc8 36. Rxa6 Rxc5 37. Rb6 Rc1+ 38. Kd2 Rc2+ 39. Ke3 d2 40. Ke2 d1=Q+ 41. Kxd1 Rxf2 42. Rxb5 Rxg2 43. Rb3 Rf2 44. Ke1 Rf5 45. Ke2 Kg7 46. Ke3 g5 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Palermo, Vicente"]
[Black "Bolbochan, Julio"]
[Result "1/2-1/2"]
[ECO "E82"]
[EventDate "1965.03.19"]
[PlyCount "82"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Nge2 c5 7. Be3 b6 8. Qd2 Nc6 9. d5 Ne5 10. b3 a6 11. Nc1 e6 12. Nd3 exd5 13. exd5 Re8 14. Nxe5 Rxe5 15. O-O-O Re7 16. Bg5 Bd7 17. Bd3 b5 18. Rde1 Rxe1+ 19. Rxe1 Qa5 20. Nb1 Qc7 21. Re7 Re8 22. Qe3 Qd8 23. Rxe8+ Qxe8 24. Qxe8+ Nxe8 25. Bf4 b4 26. a3 a5 27. axb4 axb4 28. Nd2 f5 29. Nf1 Bd4 30. Kd2 Be5 31. Be3 f4 32. Bf2 Ng7 33. g4 fxg3 34. hxg3 Nf5 35. Kd1 Nd4 36. Nd2 Kg7 37. f4 Bf6 38. Bxd4 cxd4 39. Kc2 h5 40. Be4 Bg4 41. Kd3 g5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Pilnik, Herman"]
[Black "Sanguineti, Raul"]
[Result "0-1"]
[ECO "B87"]
[EventDate "1965.03.19"]
[PlyCount "69"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 b5 8. a3 Bb7 9. Qe2 Nc6 10. Nxc6 Bxc6 11. Nd5 Nd7 12. O-O Bb7 13. Nc3 Be7 14. Bf4 O-O 15. Rad1 Qc7 16. Rd3 Rfd8 17. Rfd1 Ne5 18. Rh3 g6 19. Bc1 Nc4 20. f4 d5 21. exd5 exd5 22. f5 Bf6 23. fxg6 hxg6 24. Kh1 Qe5 25. Qf1 Re8 26. Rf3 Re6 27. Bf4 Qh5 28. Bg3 Bxc3 29. Bxc4 dxc4 30. Rxf7 Rf6 31. Rxf6 Bxf6 32. Rd7 Rd8 33. Rxb7 Rd1 34. Rb8+ Kh7 35. Rb7+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Rossetto, Hector Decio"]
[Black "Gheorghiu, Florin"]
[Result "1/2-1/2"]
[ECO "A72"]
[EventDate "1965.03.19"]
[PlyCount "58"]

1. c4 g6 2. Nc3 Bg7 3. d4 Nf6 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 h6 8. Bh4 e6 9. Nf3 exd5 10. cxd5 b5 11. Bxb5 g5 12. Nxg5 hxg5 13. Bxg5 a6 14. Ba4 Nbd7 15. O-O Qb6 16. Qd2 Nh7 17. Bxd7 Bxd7 18. Bh6 Bxh6 19. Qxh6 Qxb2 20. Qxd6 Qxc3 21. Qxd7 Qe5 22. Qg4+ Kh8 23. Rac1 f5 24. Qg3 Qxe4 25. Rxc5 Rg8 26. Qc3+ Rg7 27. Rc8+ Rxc8 28. Qxc8+ Rg8 29. Qc3+ Rg7 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.25"]
[Round "6"]
[White "Stein, Leonid"]
[Black "Najdorf, Miguel"]
[Result "0-1"]
[ECO "B96"]
[EventDate "1965.03.19"]
[PlyCount "58"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Nbd7 8. Qe2 Qc7 9. O-O-O Be7 10. g4 h6 11. Bxf6 Bxf6 12. Bg2 Nb6 13. h4 Bd7 14. Rh3 h5 15. f5 hxg4 16. Qxg4 O-O-O 17. fxe6 fxe6 18. e5 Bxe5 19. Ne4 Bxd4 20. Nxd6+ Qxd6 21. Rxd4 Qe5 22. Re4 Qf5 23. Rc3+ Bc6 24. Qg3 Qd5 25. b3 Qd6 26. Qxd6 Rxd6 27. Rg4 Kb8 28. Rxg7 Bxg2 29. Rxg2 Rxh4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Bolbochan, Julio"]
[Black "Bielicki, Carlos"]
[Result "1-0"]
[ECO "E06"]
[EventDate "1965.03.19"]
[PlyCount "81"]

1. c4 e6 2. Nf3 Nf6 3. g3 Be7 4. Bg2 O-O 5. O-O d5 6. d4 c5 7. cxd5 Nxd5 8. e4 Nc7 9. Bf4 Nc6 10. dxc5 Na6 11. Qe2 Nxc5 12. Rd1 Qa5 13. Nbd2 Rd8 14. Be3 Bd7 15. a3 Qa6 16. Qxa6 Nxa6 17. b4 Nc7 18. Bf1 Be8 19. Rac1 a6 20. Bb6 Rac8 21. Nc4 Rxd1 22. Rxd1 Na8 23. Bc5 Kf8 24. e5 Bxc5 25. bxc5 Ne7 26. Nd6 Rc7 27. Ng5 Rxc5 28. Ndxf7 Rd5 29. Rxd5 exd5 30. Nd6 Bc6 31. Nxh7+ Kg8 32. Ng5 Nc7 33. f4 Ng6 34. Bd3 Nf8 35. Bc2 g6 36. g4 Kg7 37. f5 gxf5 38. gxf5 a5 39. f6+ Kh6 40. Ngf7+ Kh5 41. Bd1+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Cruz, Raul Ceferino"]
[Black "Stein, Leonid"]
[Result "1-0"]
[ECO "A76"]
[EventDate "1965.03.19"]
[PlyCount "71"]

1. d4 Nf6 2. c4 c5 3. d5 d6 4. Nc3 g6 5. e4 Bg7 6. Be2 O-O 7. Nf3 e6 8. O-O exd5 9. cxd5 Re8 10. Qc2 Na6 11. Re1 Nb4 12. Qb1 Bg4 13. Bf4 Nh5 14. Be3 f5 15. h3 Bxf3 16. Bxf3 f4 17. Bd2 Be5 18. Ne2 Qh4 19. Bc3 Nf6 20. Qd1 h5 21. Bxb4 cxb4 22. Nd4 Rac8 23. Qd2 Nd7 24. Qxb4 a5 25. Qd2 Bxd4 26. Qxd4 Ne5 27. Rec1 g5 28. Qd2 g4 29. Qxf4 Nd3 30. Qxd6 Nxc1 31. Qg6+ Kf8 32. Qh6+ Kf7 33. Bxg4 Rh8 34. Be6+ Ke7 35. Qg7+ Kd6 36. e5+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Foguelman, Alberto"]
[Black "Palermo, Vicente"]
[Result "0-1"]
[ECO "B43"]
[EventDate "1965.03.19"]
[PlyCount "90"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. g3 Nf6 7. Bg2 b5 8. O-O Bb7 9. a3 Nc6 10. Nb3 Be7 11. Qe2 d6 12. f4 O-O-O 13. Be3 h5 14. h3 Nd7 15. Rad1 Nb6 16. Nd4 Nxd4 17. Bxd4 Bf6 18. Qf2 Bxd4 19. Qxd4 Nc4 20. Rf3 Qc5 21. b3 Nxa3 22. Rf2 Qxd4 23. Rxd4 Rd7 24. e5 Bxg2 25. Kxg2 d5 26. Nd1 Rb7 27. c3 a5 28. f5 Kd7 29. Ne3 Rc8 30. Rd3 Rbc7 31. Nd1 a4 32. Ra2 Nb1 33. bxa4 bxa4 34. Rxa4 Nxc3 35. Nxc3 Rxc3 36. Rxc3 Rxc3 37. Rh4 exf5 38. Rxh5 Ke6 39. Rh7 g6 40. Kf2 Rc7 41. h4 Kxe5 42. h5 Rc2+ 43. Kf1 Kf6 44. h6 Rc8 45. Ke2 Rg8 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Garcia, Raimundo"]
[Black "Behrensen, Jorge"]
[Result "1/2-1/2"]
[ECO "E30"]
[EventDate "1965.03.19"]
[PlyCount "164"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 e5 7. Qc2 d6 8. e3 Nbd7 9. Nf3 Qe7 10. Nd2 Bxc3 11. Qxc3 Nf8 12. Be2 Ng6 13. Bg3 O-O 14. O-O Bd7 15. Rae1 Rfe8 16. f3 a6 17. Bd3 b5 18. b3 Nh5 19. Qc2 Nxg3 20. hxg3 Nf8 21. g4 b4 22. Ra1 a5 23. a4 bxa3 24. Rxa3 Ra7 25. Rfa1 Rea8 26. Ne4 Be8 27. Qc3 Qd8 28. Bc2 Ng6 29. Qd3 Nf8 30. Kf2 f6 31. Qd2 Ng6 32. Qd3 Nf8 33. R3a2 Bg6 34. Rh1 f5 35. gxf5 Bxf5 36. g4 Bg6 37. Kg3 Rf7 38. Qc3 Rfa7 39. Kg2 Bxe4 40. Bxe4 a4 41. Rha1 a3 42. b4 cxb4 43. Qxb4 Ra4 44. Qb3 Qa5 45. Bf5 Qa7 46. Qd3 Kh8 47. Kg3 Qc5 48. g5 Qxc4 49. Qxc4 Rxc4 50. Rxa3 Rxa3 51. Rxa3 g6 52. Ra8 gxf5 53. Rxf8+ Kg7 54. Rxf5 hxg5 55. Rxg5+ Kf6 56. Rg4 Rc5 57. e4 Rc1 58. Kg2 Rc2+ 59. Kh3 Rc3 60. Kg3 Rc1 61. Kf2 Rc2+ 62. Ke3 Rc3+ 63. Ke2 Ra3 64. Rh4 Ra2+ 65. Ke3 Ke7 66. Rh7+ Kd8 67. Rf7 Ke8 68. Rf5 Ke7 69. f4 Ra3+ 70. Kf2 exf4 71. Rxf4 Rb3 72. Rf3 Rb4 73. Ke3 Rb3+ 74. Kf4 Rxf3+ 75. Kxf3 Kf7 76. Kg3 Kg7 77. Kh3 Kf7 78. Kh2 Kf8 79. Kh1 Kf7 80. Kg2 Kg8 81. Kg1 Kg7 82. Kf2 Kf8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Gheorghiu, Florin"]
[Black "Averbakh, Yuri"]
[Result "1/2-1/2"]
[ECO "E27"]
[EventDate "1965.03.19"]
[PlyCount "104"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 O-O 7. cxd5 exd5 8. e3 Nh5 9. g3 b6 10. Bd3 f5 11. Ne2 Ba6 12. Bxa6 Nxa6 13. Qd3 Qc8 14. c4 c6 15. O-O Nc7 16. cxd5 Nxd5 17. Bd2 Nhf6 18. e4 fxe4 19. fxe4 Qh3 20. Rf2 Nc7 21. Raf1 Qe6 22. e5 Nfd5 23. Rxf8+ Rxf8 24. Rxf8+ Kxf8 25. Qxh7 c5 26. Qh8+ Kf7 27. Qh5+ Kg8 28. dxc5 bxc5 29. Qg5 Nb5 30. a4 Nd4 31. Nxd4 cxd4 32. h4 Nc3 33. Qd8+ Kh7 34. Bxc3 dxc3 35. Qd3+ Qg6 36. Qxc3 Qb1+ 37. Kh2 Qa2+ 38. Kh3 Qxa4 39. Qd3+ Kg8 40. Qd5+ Kf8 41. Qd6+ Kg8 42. Qd8+ Kf7 43. Qd5+ Kf8 44. Qd6+ Kg8 45. h5 Qe4 46. e6 a5 47. Qd8+ Kh7 48. e7 Qh1+ 49. Kg4 Qe4+ 50. Kg5 Qe3+ 51. Kh4 Qe4+ 52. g4 Qe1+ 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Najdorf, Miguel"]
[Black "Pilnik, Herman"]
[Result "1-0"]
[ECO "D90"]
[EventDate "1965.03.19"]
[PlyCount "114"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 g6 5. cxd5 cxd5 6. Bf4 Nc6 7. e3 Bg7 8. h3 O-O 9. Bd3 Qb6 10. a3 a6 11. O-O Bd7 12. Na4 Qa7 13. Rc1 Rfc8 14. Qb3 b5 15. Nc5 Be8 16. Bh2 e6 17. Rc2 Na5 18. Qa2 Nd7 19. Rfc1 Nxc5 20. Rxc5 Nc4 21. b3 Rxc5 22. dxc5 Na5 23. Be5 f6 24. Bc3 Nc6 25. b4 Ne5 26. Nxe5 fxe5 27. e4 Bc6 28. Re1 Re8 29. Qa1 Qc7 30. Bc2 d4 31. Bd2 Qd7 32. Bd3 Rf8 33. Qa2 h5 34. a4 Qf7 35. Bg5 Kh7 36. axb5 axb5 37. Qe2 Qb7 38. Ra1 Ra8 39. Rxa8 Qxa8 40. Bxb5 Bxe4 41. f3 Bd5 42. Bd3 Qa1+ 43. Qf1 Qc3 44. Qb1 e4 45. fxe4 Bc4 46. Bxc4 Qxc4 47. Qc1 Qxb4 48. c6 Qb8 49. c7 Qc8 50. Qc5 Bf8 51. Qb6 d3 52. Qb8 Bc5+ 53. Kh1 d2 54. Bxd2 Qa6 55. Qb1 Bd6 56. Qc1 Qc8 57. Ba5 Be7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Panno, Oscar"]
[Black "Rossetto, Hector Decio"]
[Result "0-1"]
[ECO "D22"]
[EventDate "1965.03.19"]
[PlyCount "84"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 Bg4 5. Bxc4 e6 6. Nc3 a6 7. Be2 Nc6 8. h3 Bh5 9. g4 Bg6 10. Nh4 Be4 11. f3 Bd6 12. Kf2 Nd5 13. Ng2 Bg6 14. e4 Nb6 15. Be3 Be7 16. h4 h6 17. Qd2 Qd6 18. Nf4 O-O-O 19. Rad1 Bh7 20. Qc1 g5 21. hxg5 hxg5 22. Nh3 f6 23. Kg2 Qb4 24. a3 Qb3 25. d5 Ne5 26. Bxb6 Qxb6 27. dxe6 Qxe6 28. Rxd8+ Bxd8 29. Nd5 Ng6 30. Qc3 Nh4+ 31. Kf2 Bg6 32. Nxg5 Qd6 33. Nh3 Bf7 34. Ne3 c6 35. Qd3 Qe5 36. Qc3 Qd6 37. Qd3 Qe7 38. b4 Bb6 39. Kf1 Qe5 40. f4 Qa1+ 41. Qd1 Qxa3 42. Ng2 Qg3 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.27"]
[Round "7"]
[White "Sanguineti, Raul"]
[Black "Benko, Pal"]
[Result "1/2-1/2"]
[ECO "B08"]
[EventDate "1965.03.19"]
[PlyCount "63"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5 Bg7 5. h3 O-O 6. Nf3 Nbd7 7. Bc4 c5 8. O-O Nb6 9. Be2 cxd4 10. Nxd4 Bd7 11. Qd2 Na4 12. Bxf6 Bxf6 13. Nxa4 Bxa4 14. c3 Qb6 15. Bd1 Bd7 16. Re1 Rfd8 17. Nf3 Be8 18. Nh2 Rac8 19. Bb3 a5 20. Ng4 Bg7 21. Ne3 e6 22. Bc4 Bh6 23. Bf1 Qc5 24. a4 d5 25. exd5 Rxd5 26. Qc2 Bxe3 27. Rxe3 Rcd8 28. Rd3 Rxd3 29. Bxd3 Bc6 30. Bf1 Qd6 31. b3 Qc5 32. Re1 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Averbakh, Yuri"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]
[ECO "A49"]
[EventDate "1965.03.19"]
[PlyCount "62"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. d5 b5 7. a4 Bb7 8. axb5 Bxd5 9. c4 Bb7 10. Nc3 d6 11. Bg5 Nbd7 12. Ne1 Qc8 13. Bxb7 Qxb7 14. Ra6 Nb6 15. Bxf6 Bxf6 16. Qd3 Bxc3 17. bxc3 d5 18. cxd5 c4 19. Qd4 Qxd5 20. Ra5 Qe6 21. Qd2 Rfd8 22. Qc2 Nd5 23. Nf3 Qf6 24. Rc1 Rab8 25. Nd4 Rd7 26. e3 Rb6 27. Qe4 e6 28. Nc6 Nxc3 29. Qxc4 Rd2 30. Ne7+ Qxe7 31. Qxc3 Rd8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Behrensen, Jorge"]
[Black "Sanguineti, Raul"]
[Result "0-1"]
[ECO "D02"]
[EventDate "1965.03.19"]
[PlyCount "80"]

1. d4 Nf6 2. Nf3 c5 3. g3 cxd4 4. Nxd4 d5 5. Bg2 e5 6. Nb3 h6 7. c4 d4 8. O-O Nc6 9. e3 Bg4 10. f3 Be6 11. exd4 exd4 12. Re1 Be7 13. Na3 O-O 14. Bf1 Qb6 15. Nb5 Bb4 16. c5 Bxb3 17. cxb6 Bxd1 18. Rxd1 a6 19. Na3 Nd5 20. Nc4 Bc5 21. a3 Nxb6 22. b4 Nxc4 23. bxc5 Ne3 24. Bxe3 dxe3 25. Rab1 Rad8 26. Re1 Rfe8 27. Rxb7 Rd2 28. Be2 Nd4 29. Kf1 Re5 30. Rb8+ Kh7 31. Rc8 Rf5 32. f4 g5 33. Bg4 Rf6 34. f5 h5 35. Bxh5 Rxf5+ 36. Kg1 Rff2 37. c6 Rg2+ 38. Kh1 Rxh2+ 39. Kg1 Rdg2+ 40. Kf1 Nf5 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Benko, Pal"]
[Black "Najdorf, Miguel"]
[Result "1/2-1/2"]
[ECO "E17"]
[EventDate "1965.03.19"]
[PlyCount "116"]

1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. d4 Be7 6. Nc3 Ne4 7. Bd2 O-O 8. d5 f5 9. Qc2 Nxc3 10. Bxc3 Na6 11. O-O Nc5 12. Nd2 a5 13. b3 Bf6 14. a3 Bxc3 15. Qxc3 exd5 16. cxd5 Ba6 17. b4 Nb7 18. Rfc1 Rc8 19. e4 fxe4 20. Nxe4 Be2 21. Qd4 Bh5 22. d6 c6 23. b5 Bf7 24. bxc6 Rxc6 25. Rab1 b5 26. Nc5 Nxc5 27. Rxc5 Rxc5 28. Qxc5 Qf6 29. Qxb5 Qxd6 30. Qxa5 Qd3 31. Qb4 d5 32. Qb3 Qf5 33. Rd1 d4 34. Qb2 d3 35. Qd4 Bg6 36. Qd5+ Qxd5 37. Bxd5+ Kh8 38. f3 Rd8 39. Be4 Bxe4 40. fxe4 d2 41. Kf2 Rd3 42. a4 Kg8 43. Ke2 Ra3 44. Rxd2 Rxa4 45. Kf3 Kf7 46. Kf4 Ra1 47. Rd7+ Kg6 48. Ke5 Ra2 49. h4 h5 50. Ke6 Ra3 51. Rd6 Re3 52. Ke5+ Kf7 53. Kf4 Re1 54. Rd5 g6 55. Ke5 Re3 56. Rd7+ Ke8 57. Ra7 Rxg3 58. Ke6 Kf8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Bielicki, Carlos"]
[Black "Foguelman, Alberto"]
[Result "1/2-1/2"]
[ECO "D94"]
[EventDate "1965.03.19"]
[PlyCount "89"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. b4 a5 7. b5 c5 8. bxc6 bxc6 9. cxd5 cxd5 10. Ba3 Nbd7 11. Bd3 Ba6 12. O-O Bxd3 13. Qxd3 Nb6 14. Ne5 Rc8 15. Rac1 Ne8 16. Qa6 Bxe5 17. dxe5 Rb8 18. Qxa5 Nc7 19. Qc5 Re8 20. Rb1 Ne6 21. Qc6 Nc4 22. Bxe7 Rc8 23. Bxd8 Rxc6 24. Nxd5 Nxd8 25. Nf6+ Rxf6 26. exf6 Nd2 27. Rb8 Nxf1 28. Kxf1 Kf8 29. Ke2 Ne6 30. Rxe8+ Kxe8 31. e4 Nc5 32. Ke3 Nd7 33. Kd4 Nxf6 34. f3 Ke7 35. a4 Nd7 36. f4 Kd6 37. g4 Nc5 38. e5+ Kc6 39. f5 Nxa4 40. e6 fxe6 41. fxg6 hxg6 42. Ke5 Nc5 43. h4 Kd7 44. Kf6 e5 45. Kxe5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Cruz, Raul Ceferino"]
[Black "Bolbochan, Julio"]
[Result "0-1"]
[ECO "A38"]
[EventDate "1965.03.19"]
[PlyCount "84"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. g3 O-O 5. Bg2 c5 6. Nf3 cxd4 7. Nxd4 Nc6 8. O-O Qa5 9. Nc2 d6 10. h3 Ne5 11. Ne3 Be6 12. Ncd5 Bxd5 13. Nxd5 Nxd5 14. Qxd5 Qxd5 15. Bxd5 Rab8 16. f4 Nd7 17. Be3 Bxb2 18. Rab1 Ba3 19. Bxb7 Bc5 20. Kf2 Bxe3+ 21. Kxe3 Nb6 22. Ba6 Na4 23. Bb5 Nc5 24. Bc6 Rfc8 25. Bf3 Nd7 26. Kd4 Nb6 27. Rfc1 Rc5 28. Rb5 Rbc8 29. Rxc5 Rxc5 30. Rc3 Kf8 31. e4 f6 32. Be2 e5+ 33. Kd3 Ra5 34. a3 Na4 35. Rb3 Nc5+ 36. Kc3 Nxb3 37. Kxb3 exf4 38. gxf4 Ke7 39. a4 f5 40. e5 dxe5 41. Kb4 Ra6 42. c5 Re6 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Palermo, Vicente"]
[Black "Gheorghiu, Florin"]
[Result "0-1"]
[ECO "A46"]
[EventDate "1965.03.19"]
[PlyCount "74"]

1. d4 Nf6 2. Nf3 d6 3. Bg5 h6 4. Bh4 Bf5 5. e3 Nbd7 6. Bd3 Bxd3 7. Qxd3 c6 8. Nbd2 g5 9. Bg3 Nh5 10. h4 g4 11. Nh2 Nxg3 12. fxg3 h5 13. O-O e6 14. Rf2 d5 15. e4 Bh6 16. exd5 cxd5 17. Raf1 O-O 18. Rxf7 Rxf7 19. Qg6+ Rg7 20. Qxh6 Qe8 21. Re1 Qg6 22. Rxe6 Qxh6 23. Rxh6 Re8 24. Rxh5 Re2 25. Nhf1 Nf6 26. Rf5 Ne4 27. Nxe4 dxe4 28. d5 Rf7 29. Rf4 Rxf4 30. gxf4 e3 31. d6 Kf7 32. Nxe3 Rxe3 33. Kf2 Re4 34. Kg3 Re2 35. Kxg4 Rxg2+ 36. Kf5 Rh2 37. Kg5 Rd2 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Rossetto, Hector Decio"]
[Black "Garcia, Raimundo"]
[Result "1/2-1/2"]
[ECO "D01"]
[EventDate "1965.03.19"]
[PlyCount "146"]

1. d4 Nf6 2. Nc3 d5 3. Bg5 Nbd7 4. Qd3 e6 5. e4 dxe4 6. Nxe4 Be7 7. Nxf6+ Nxf6 8. O-O-O Qd5 9. Qb5+ Qxb5 10. Bxb5+ Bd7 11. Bxd7+ Nxd7 12. Bxe7 Kxe7 13. f4 Rhd8 14. Nf3 Kf8 15. Rhf1 Rac8 16. Rd3 c5 17. Rfd1 c4 18. Ra3 a6 19. Re3 Nf6 20. Ne5 Nd5 21. Rf3 b5 22. c3 a5 23. Rd2 b4 24. Rc2 b3 25. axb3 cxb3 26. Rd2 a4 27. Nd3 a3 28. bxa3 Nxc3 29. Kb2 Rxd4 30. Kxb3 Nb5 31. Rc2 Rxc2 32. Kxc2 Nxa3+ 33. Kd2 Nb5 34. Ke3 Ra4 35. Rf2 Nc3 36. Rf1 Nd5+ 37. Ke2 Re4+ 38. Kd2 h5 39. g3 Ra4 40. Rb1 Ra2+ 41. Rb2 Rxb2+ 42. Nxb2 Nb6 43. Ke3 Ke7 44. Ke4 f6 45. Kd4 Kd6 46. Nd3 Nd7 47. h3 g5 48. fxg5 fxg5 49. Ke4 Nf6+ 50. Kd4 Nd7 51. Ke4 Ke7 52. Nb4 Nc5+ 53. Ke5 Nd7+ 54. Ke4 Kf6 55. Nc6 Nc5+ 56. Kd4 Nb7 57. Ne5 Nd6 58. g4 Nb5+ 59. Ke4 Nc3+ 60. Kd4 Ne2+ 61. Ke4 h4 62. Nf3 Nc3+ 63. Ke3 Nd5+ 64. Ke4 Ne7 65. Ne5 Ng6 66. Nxg6 Kxg6 67. Ke5 Kf7 68. Kd4 Kf8 69. Kc5 Ke7 70. Kc6 e5 71. Kd5 Kf6 72. Kc4 Ke6 73. Kc5 Kf7 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.28"]
[Round "8"]
[White "Stein, Leonid"]
[Black "Pilnik, Herman"]
[Result "1-0"]
[ECO "A07"]
[EventDate "1965.03.19"]
[PlyCount "81"]

1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. O-O Nf6 5. d3 O-O 6. Nbd2 b6 7. e4 dxe4 8. dxe4 Nfd7 9. e5 Nc5 10. Nb3 Ba6 11. Re1 Nbd7 12. Nbd4 Bb7 13. b4 Ne6 14. Nxe6 fxe6 15. Bf4 Qc8 16. Ng5 Bxg2 17. Kxg2 Rf5 18. Nxe6 Bxe5 19. Nd4 Bxd4 20. Qxd4 Qb7+ 21. Kg1 c5 22. Qc4+ Qd5 23. Qxd5+ Rxd5 24. Rxe7 cxb4 25. Rae1 Nf6 26. Be5 Rf8 27. Rxa7 Re8 28. f4 Nd7 29. Bc3 Rxe1+ 30. Bxe1 Rd1 31. Kf2 Nc5 32. Bxb4 Rc1 33. c3 Rc2+ 34. Ke3 Rxh2 35. a4 Rg2 36. Kf3 Rc2 37. a5 Na4 38. a6 Ra2 39. Rb7 Nxc3 40. a7 Nd5 41. Bd6 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Bolbochan, Julio"]
[Black "Stein, Leonid"]
[Result "1/2-1/2"]
[ECO "E69"]
[EventDate "1965.03.19"]
[PlyCount "164"]

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d6 6. d4 Nbd7 7. Nc3 e5 8. e4 c6 9. Rb1 a5 10. Re1 exd4 11. Nxd4 Nc5 12. h3 Re8 13. Bf4 Qb6 14. Nb3 Ne6 15. Be3 Qc7 16. Na4 Nd7 17. Qd2 Ne5 18. Qe2 Nxc4 19. Qxc4 b5 20. Qc2 bxa4 21. Nd2 Rb8 22. Qxa4 Ba6 23. Bf1 Bxf1 24. Rxf1 Rb4 25. Qc2 Nd4 26. Qd3 c5 27. b3 Qd7 28. Kg2 d5 29. f3 dxe4 30. Nxe4 Qc6 31. Rbc1 Nxf3 32. Rxf3 Rbxe4 33. Rxc5 Qa8 34. Bf2 Rd8 35. Qc2 Bh6 36. Rc6 Re7 37. Qc4 Red7 38. Qa6 Qxa6 39. Rxa6 Rd5 40. g4 Bg7 41. Be1 Rd1 42. Bxa5 Rc8 43. Rf2 Be5 44. Bd2 h5 45. Ra4 hxg4 46. hxg4 Ra1 47. Re4 Bg7 48. a4 Ra3 49. Rb4 Ra1 50. Bg5 Rb1 51. Bf6 Bxf6 52. Rxf6 Rc3 53. Rf3 Rc2+ 54. Rf2 Rc3 55. Rb8+ Kg7 56. Rb7 Rbxb3 57. Rfxf7+ Kh6 58. Rxb3 Rxb3 59. Rf4 Kg5 60. Re4 Kh4 61. Kf2 Rd3 62. Ke2 Rd5 63. Rb4 Kg3 64. Ke3 Rg5 65. Rc4 Rd5 66. Ke4 Rg5 67. Kd3 Kf3 68. Kd2 Kf2 69. Rf4+ Kg3 70. Rb4 Kf2 71. Kd3 Kf3 72. Rc4 Kf2 73. Kc3 Ke3 74. Kb4 Kd3 75. Rc3+ Ke2 76. a5 Rxg4+ 77. Kb5 Rg1 78. a6 Rb1+ 79. Ka4 Rb8 80. Rg3 Rg8 81. Kb5 g5 82. a7 Kf2 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Foguelman, Alberto"]
[Black "Cruz, Raul Ceferino"]
[Result "1-0"]
[ECO "B80"]
[EventDate "1965.03.19"]
[PlyCount "69"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. g3 Nf6 7. Bg2 d6 8. O-O Be7 9. g4 h6 10. h3 Nc6 11. a3 Bd7 12. Re1 Rc8 13. Nde2 Ne5 14. b3 g5 15. Be3 h5 16. f3 hxg4 17. hxg4 d5 18. exd5 Nexg4 19. fxg4 Qh2+ 20. Kf1 Nxg4 21. Bg1 Qe5 22. Qd3 Rh6 23. Ne4 exd5 24. Nd2 Bb5 25. c4 dxc4 26. bxc4 Rf6+ 27. Bf3 Rxc4 28. Kg2 Rcc6 29. Qe4 Rc4 30. Nxc4 Bxc4 31. Qxc4 Rxf3 32. Qxg4 Rf5 33. Rad1 f6 34. Ng3 Rf4 35. Qh5+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Garcia, Raimundo"]
[Black "Averbakh, Yuri"]
[Result "0-1"]
[ECO "D32"]
[EventDate "1965.03.19"]
[PlyCount "58"]

1. Nf3 Nf6 2. c4 e6 3. Nc3 d5 4. e3 c5 5. d4 Nc6 6. a3 a6 7. cxd5 exd5 8. Be2 cxd4 9. Nxd4 Bd6 10. O-O O-O 11. Nf3 Be6 12. b4 Rc8 13. Bb2 a5 14. Nb5 Be7 15. bxa5 Nxa5 16. Bxf6 Bxf6 17. Nbd4 Qe7 18. Qa4 Rc5 19. Rab1 Rfc8 20. Qb4 Bd7 21. Bb5 Bxb5 22. Nxb5 b6 23. Qg4 g6 24. h3 Nc4 25. Rfd1 h5 26. Qf4 Nb2 27. Rxb2 Bxb2 28. Qb4 Bf6 29. Nbd4 Rc1 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Gheorghiu, Florin"]
[Black "Bielicki, Carlos"]
[Result "1-0"]
[ECO "C63"]
[EventDate "1965.03.19"]
[PlyCount "65"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. Nc3 Nd4 5. exf5 c6 6. Nxd4 exd4 7. Qh5+ Ke7 8. O-O dxc3 9. dxc3 d6 10. Bc4 d5 11. Re1+ Kd7 12. Qf7+ Ne7 13. Bg5 Qe8 14. Qe6+ Kd8 15. Qd6+ Qd7 16. Qe5 Qc7 17. Bd3 Qxe5 18. Rxe5 h6 19. Bh4 Kd7 20. Rae1 Ng8 21. c4 dxc4 22. Bxc4 b5 23. Bf7 Nf6 24. Bg3 Bb7 25. a4 a6 26. Be6+ Kd8 27. Rd1+ Nd5 28. c3 Be7 29. b3 Bf6 30. Re3 bxa4 31. bxa4 Bxc3 32. Rxc3 Rc8 33. Bxc8 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Najdorf, Miguel"]
[Black "Behrensen, Jorge"]
[Result "1-0"]
[ECO "D16"]
[EventDate "1965.03.19"]
[PlyCount "81"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bg4 6. Ne5 Bh5 7. g3 e6 8. Bg2 Be7 9. O-O Nbd7 10. Nxc4 O-O 11. h3 Nd5 12. Re1 Nb4 13. a5 f6 14. Bf4 Nb8 15. Ne4 N8a6 16. Qb3 g5 17. Bd6 Bg6 18. Bxe7 Qxe7 19. Rac1 Rfd8 20. Red1 Rd7 21. Nc5 Nxc5 22. Qxb4 Na6 23. Qxe7 Rxe7 24. e4 Rd8 25. e5 Red7 26. Nd6 Nb4 27. Rc3 Kg7 28. Rd2 Nd5 29. Bxd5 cxd5 30. Rd1 fxe5 31. dxe5 Bh5 32. Rd4 Be2 33. f4 h6 34. Kf2 Bh5 35. Rb3 gxf4 36. gxf4 Rb8 37. Rdb4 b6 38. axb6 axb6 39. Rxb6 Rf8 40. Rb7 Rfd8 41. Ke3 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Panno, Oscar"]
[Black "Palermo, Vicente"]
[Result "1-0"]
[ECO "A11"]
[EventDate "1965.03.19"]
[PlyCount "67"]

1. Nf3 Nf6 2. c4 c6 3. Nc3 d5 4. e3 dxc4 5. Bxc4 b5 6. Bb3 Nbd7 7. d4 e6 8. O-O a6 9. Qe2 c5 10. Rd1 Qb6 11. a4 b4 12. a5 Qc7 13. Na4 Bb7 14. Bd2 cxd4 15. exd4 Bd5 16. Bxd5 Nxd5 17. Rdc1 Qa7 18. Ne5 Nxe5 19. Qxe5 Be7 20. Nb6 Rd8 21. Nc8 Qd7 22. Nxe7 Nxe7 23. Bxb4 Qxd4 24. Qe1 Nd5 25. Bc5 Qg4 26. h3 Qf5 27. Qe2 Ra8 28. Ra3 h5 29. Rf3 Qg5 30. Qc4 h4 31. Be3 Nxe3 32. Qc6+ Ke7 33. Qb7+ Kd6 34. Qc7+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Pilnik, Herman"]
[Black "Benko, Pal"]
[Result "1/2-1/2"]
[ECO "B59"]
[EventDate "1965.03.19"]
[PlyCount "110"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nb3 Be7 8. O-O O-O 9. Be3 Be6 10. Bf3 a5 11. Nd5 Bxd5 12. exd5 Nb8 13. a4 Nfd7 14. Be2 Bg5 15. Bb5 Bxe3 16. fxe3 Nf6 17. Qd3 Nbd7 18. Bxd7 Nxd7 19. Qb5 Qc7 20. Nd2 Ra6 21. Rac1 Nc5 22. b3 Raa8 23. e4 g6 24. Rf6 Nd7 25. Rf2 f6 26. Rcf1 Rf7 27. g4 Kg7 28. Nc4 Nc5 29. Re1 Ra6 30. h3 Qd8 31. Ree2 Qc7 32. Kg2 Nd7 33. Rf3 Ra8 34. Rf1 Nc5 35. Nd2 Qd7 36. Qxd7 Nxd7 37. Nc4 Ra6 38. g5 h6 39. h4 hxg5 40. hxg5 Rf8 41. gxf6+ Rxf6 42. Rxf6 Nxf6 43. Kf3 g5 44. Rh2 g4+ 45. Ke3 Kg6 46. Rh8 g3 47. Kf3 g2 48. Kxg2 Nxe4 49. Rd8 Nc3 50. Rxd6+ Rxd6 51. Nxd6 b6 52. Nc8 Nxd5 53. c4 Nb4 54. Nxb6 Na6 55. Nd7 Kf5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.03.29"]
[Round "9"]
[White "Sanguineti, Raul"]
[Black "Rossetto, Hector Decio"]
[Result "1/2-1/2"]
[ECO "C62"]
[EventDate "1965.03.19"]
[PlyCount "35"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. d4 Bd7 5. Nc3 Nf6 6. Bxc6 Bxc6 7. Qd3 Qe7 8. Bg5 h6 9. Bxf6 Qxf6 10. O-O-O exd4 11. Nxd4 Be7 12. Kb1 O-O 13. Nf5 Rfe8 14. Nd5 Bxd5 15. Qxd5 Bf8 16. f3 g6 17. Ne3 Bg7 18. c3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Averbakh, Yuri"]
[Black "Sanguineti, Raul"]
[Result "1-0"]
[ECO "A90"]
[EventDate "1965.03.19"]
[PlyCount "73"]

1. c4 e6 2. d4 Bb4+ 3. Nd2 f5 4. Ngf3 Nf6 5. g3 O-O 6. Bg2 d6 7. O-O Bxd2 8. Bxd2 Nbd7 9. Bb4 Qe7 10. Ba3 Rb8 11. c5 b5 12. cxb6 axb6 13. Ne5 Nxe5 14. dxe5 Ne8 15. Bc6 Bd7 16. Rc1 Bxc6 17. Rxc6 Qd7 18. Qc1 Rf7 19. exd6 cxd6 20. Qc3 b5 21. Rc1 Rb7 22. Rc8 Re7 23. Bb4 Kf7 24. Qd3 Nc7 25. Qxd6 Nd5 26. Rd8 Qxd6 27. Bxd6 Red7 28. Rf8+ Kg6 29. Be5 b4 30. Rc4 Rb5 31. e4 Nb6 32. Rc6 Rxe5 33. exf5+ Kh5 34. Rxb6 exf5 35. Rxb4 Rc5 36. Rxf5+ Rxf5 37. g4+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Behrensen, Jorge"]
[Black "Pilnik, Herman"]
[Result "0-1"]
[ECO "A07"]
[EventDate "1965.03.19"]
[PlyCount "68"]

1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. O-O Nf6 5. d3 b6 6. c4 c6 7. cxd5 Nxd5 8. Qb3 O-O 9. Nc3 Bb7 10. Bg5 Nd7 11. Qa3 Re8 12. Nxd5 cxd5 13. Rac1 h6 14. Be3 e5 15. Qd6 d4 16. Rc7 Nc5 17. Qxd8 Raxd8 18. Bd2 a5 19. b4 axb4 20. Rb1 Bf8 21. Bxb4 Bd6 22. Rxb7 Nxb7 23. Nd2 Nc5 24. Nc4 Bc7 25. Bxc5 bxc5 26. a4 Rb8 27. Ra1 Re6 28. Bh3 f5 29. g4 Rf6 30. a5 Ra8 31. gxf5 gxf5 32. a6 Ra7 33. Rb1 Raxa6 34. Rb7 Rg6+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Bielicki, Carlos"]
[Black "Panno, Oscar"]
[Result "0-1"]
[ECO "E61"]
[EventDate "1965.03.19"]
[PlyCount "98"]

1. d4 Nf6 2. c4 c5 3. e3 g6 4. Nc3 Bg7 5. Nf3 O-O 6. d5 d6 7. Be2 e5 8. e4 h6 9. Nd2 h5 10. Nb3 a6 11. a4 Nh7 12. Be3 h4 13. O-O Nd7 14. a5 f5 15. exf5 gxf5 16. f4 Qe7 17. Bd3 e4 18. Be2 Rf6 19. Qd2 Rg6 20. Nd1 Ndf6 21. Nf2 Bd7 22. Kh1 Kh8 23. Rab1 Rg8 24. Rg1 Ng4 25. Nxg4 fxg4 26. g3 Nf6 27. Kg2 Nh5 28. Rh1 Bf6 29. Nc1 Ng7 30. Bd1 Nf5 31. Ne2 Qg7 32. Bc2 Re8 33. b4 Bd4 34. Bg1 Bc8 35. bxc5 dxc5 36. Rd1 Bxg1 37. Rhxg1 Nd6 38. Bb3 e3 39. Qc3 Bf5 40. Qxg7+ Rxg7 41. Rge1 Be4+ 42. Kf1 Bf3 43. Rd3 Rh7 44. gxh4 Rxh4 45. Ng3 e2+ 46. Nxe2 Rxh2 47. Ng3 Rxe1+ 48. Kxe1 Rg2 49. Nh5 Ne4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Bolbochan, Julio"]
[Black "Foguelman, Alberto"]
[Result "1-0"]
[ECO "D48"]
[EventDate "1965.03.19"]
[PlyCount "77"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. d5 c4 11. dxe6 fxe6 12. Bc2 Qc7 13. Ng5 Qc6 14. Ne2 e5 15. O-O Bc5 16. Nc3 Nb6 17. Nd5 O-O 18. b4 Bd6 19. Be3 Nbd7 20. f4 Re8 21. f5 Nf8 22. Rf3 h6 23. Nxf6+ gxf6 24. Ne6 Bxe6 25. fxe6 Nh7 26. Rg3+ Kh8 27. Qd5 Rac8 28. Bxh6 Bf8 29. Bxf8 Nxf8 30. Rf1 Qb6+ 31. Kh1 Rcd8 32. Rxf6 Rxd5 33. exd5 Nh7 34. Rf7 Nf8 35. Rh3+ Kg8 36. Rg3+ Kh8 37. e7 Qh6 38. Rh3 Qxh3 39. exf8=Q+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Cruz, Raul Ceferino"]
[Black "Gheorghiu, Florin"]
[Result "1/2-1/2"]
[ECO "A53"]
[EventDate "1965.03.19"]
[PlyCount "55"]

1. d4 Nf6 2. c4 d6 3. Nc3 Bf5 4. Nf3 h6 5. g3 Nbd7 6. Bg2 c6 7. O-O e5 8. e3 Be7 9. Qe2 O-O 10. e4 Bh7 11. d5 Nc5 12. Ne1 a5 13. Nd3 Nxd3 14. Qxd3 Nd7 15. Be3 f5 16. exf5 Bxf5 17. Be4 Bxe4 18. Nxe4 c5 19. a4 Qe8 20. Kg2 Nf6 21. Nc3 Qh5 22. f3 Rae8 23. Rae1 Bd8 24. Bd2 Re7 25. g4 Qe8 26. h4 b6 27. b3 Kh8 28. h5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Palermo, Vicente"]
[Black "Garcia, Raimundo"]
[Result "0-1"]
[ECO "D40"]
[EventDate "1965.03.19"]
[PlyCount "83"]

1. Nf3 d5 2. c4 e6 3. e3 c5 4. d4 cxd4 5. exd4 Nf6 6. Nc3 Be7 7. Bd3 dxc4 8. Bxc4 O-O 9. O-O Nbd7 10. Qe2 Nb6 11. Bb3 Bd7 12. Bg5 Bc6 13. Rad1 Bd5 14. Nxd5 Nfxd5 15. Bc1 Rc8 16. Ne5 Bg5 17. f4 Rxc1 18. Rxc1 Nxf4 19. Qf2 Qxd4 20. Qxd4 Ne2+ 21. Kh1 Nxd4 22. Rc7 Nxb3 23. axb3 f6 24. Nf3 Be3 25. Re1 Nd5 26. Rd7 Re8 27. Re2 Kf8 28. Rxb7 Re7 29. Rb5 h5 30. Nd2 g5 31. Nc4 Bb6 32. g3 g4 33. Kg2 Ke8 34. Nd6+ Kd7 35. Ne4 Kc6 36. Rxd5 exd5 37. Rc2+ Kb5 38. Nxf6 Re5 39. Rd2 d4 40. h3 gxh3+ 41. Kxh3 Bd8 42. Nd7 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Rossetto, Hector Decio"]
[Black "Najdorf, Miguel"]
[Result "1/2-1/2"]
[ECO "E92"]
[EventDate "1965.03.19"]
[PlyCount "79"]

1. d4 Nf6 2. c4 c5 3. d5 g6 4. Nc3 Bg7 5. e4 d6 6. Nf3 O-O 7. Be2 e5 8. Bg5 h6 9. Bh4 Qc7 10. O-O Nh5 11. Ne1 Nf4 12. f3 f5 13. a3 a6 14. Rb1 Nd7 15. Bf2 Nf6 16. Nd3 fxe4 17. Nxe4 Nxe4 18. fxe4 Bd7 19. Be3 g5 20. Nf2 b5 21. b3 Nxe2+ 22. Qxe2 Rab8 23. h4 gxh4 24. Qh5 Kh7 25. Qxh4 Qd8 26. Qh5 Qe8 27. Qxe8 Bxe8 28. cxb5 axb5 29. Nh1 Bd7 30. Ng3 Kg6 31. Rxf8 Rxf8 32. a4 Ra8 33. axb5 Rb8 34. Ra1 Rxb5 35. Ra7 Bg4 36. Nf5 Bxf5 37. exf5+ Kf6 38. Bf2 Rb4 39. Ra6 Kxf5 40. Rxd6 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.01"]
[Round "10"]
[White "Stein, Leonid"]
[Black "Benko, Pal"]
[Result "1-0"]
[ECO "C66"]
[EventDate "1965.03.19"]
[PlyCount "88"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O d6 5. Re1 Be7 6. c3 O-O 7. d4 Bd7 8. a4 Bg4 9. Bxc6 bxc6 10. dxe5 Bxf3 11. Qxf3 dxe5 12. Nd2 Qc8 13. Qf5 Nd7 14. Nc4 g6 15. Qg4 h5 16. Qe2 Qa6 17. Be3 c5 18. Qd3 Qe6 19. Red1 Nb6 20. Na5 c4 21. Qe2 c5 22. Rd2 Rab8 23. Rad1 Rfc8 24. h3 Kg7 25. f3 Rd8 26. Rxd8 Rxd8 27. Rxd8 Bxd8 28. Nb7 Be7 29. a5 Qc6 30. axb6 axb6 31. Qxc4 Qxb7 32. Qb5 Qc7 33. Kf2 Kf6 34. Ke2 Qd6 35. Qe8 Qd8 36. Qxd8 Bxd8 37. Kd3 Ke6 38. Kc4 Kd6 39. Kb5 Kc7 40. b4 cxb4 41. cxb4 Kb7 42. g4 hxg4 43. fxg4 g5 44. Bc1 f6 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Benko, Pal"]
[Black "Behrensen, Jorge"]
[Result "1-0"]
[ECO "C00"]
[EventDate "1965.03.19"]
[PlyCount "80"]

1. e4 c5 2. Nf3 e6 3. d3 Nc6 4. g3 Be7 5. Bg2 d5 6. Nbd2 Nf6 7. O-O O-O 8. Re1 dxe4 9. dxe4 b6 10. c3 Bb7 11. e5 Nd7 12. Nc4 Qc7 13. Bf4 Rad8 14. Qc2 h6 15. h4 b5 16. Nd6 Bxd6 17. exd6 Qb6 18. g4 Na5 19. g5 h5 20. Bg3 Rfe8 21. g6 f6 22. Qe2 Qc6 23. Red1 Qe4 24. Qxb5 f5 25. Qxa5 f4 26. Ne1 Qxg6 27. Bxf4 Qg4 28. Bg3 g5 29. Bxb7 gxh4 30. Bg2 hxg3 31. fxg3 Qxg3 32. Rd3 Qg6 33. Rad1 e5 34. Qa4 e4 35. Qc4+ Kh8 36. Rh3 Re5 37. Qe2 Rg8 38. c4 Rg5 39. Rd5 Ne5 40. d7 Qf5 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Foguelman, Alberto"]
[Black "Stein, Leonid"]
[Result "0-1"]
[ECO "E62"]
[EventDate "1965.03.19"]
[PlyCount "64"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. Nc3 e5 8. dxe5 dxe5 9. Nb5 Qe7 10. b3 Rd8 11. Qe1 a5 12. e4 Nb4 13. Ba3 Bg4 14. Qe2 c6 15. Nc3 Nd7 16. Rad1 Nc5 17. Rxd8+ Rxd8 18. Rd1 Ne6 19. Rxd8+ Qxd8 20. Qd2 Nd4 21. Kf1 Bf6 22. Nxd4 exd4 23. Na4 d3 24. f3 Bg5 25. f4 Be7 26. Bb2 b5 27. cxb5 cxb5 28. Nc3 Qd4 29. Qf2 Be2+ 30. Nxe2 Qxb2 31. Bf3 dxe2+ 32. Bxe2 Qxa2 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Garcia, Raimundo"]
[Black "Bielicki, Carlos"]
[Result "1-0"]
[ECO "A14"]
[EventDate "1965.03.19"]
[PlyCount "81"]

1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. O-O Be7 6. b3 O-O 7. Bb2 d5 8. e3 Nbd7 9. Nc3 a6 10. cxd5 exd5 11. Rc1 Re8 12. Qc2 Bd6 13. Rfd1 Qe7 14. Qf5 c6 15. Qb1 Rad8 16. Re1 Qf8 17. d3 g6 18. Na4 b5 19. Nc3 c5 20. Qa1 Ng4 21. h3 Nh6 22. Nd2 Nb6 23. a4 b4 24. Ne2 a5 25. d4 Nd7 26. Red1 Nf5 27. Nf3 Ba6 28. dxc5 Bxe2 29. cxd6 Bxd1 30. Rxd1 Qxd6 31. g4 Ne7 32. Nd4 Nc8 33. Nb5 Qf8 34. Nc7 Ndb6 35. Nxe8 Qxe8 36. Qc1 Rd6 37. Qc5 Qc6 38. Qd4 f6 39. g5 Ne7 40. Rc1 Qd7 41. gxf6 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Gheorghiu, Florin"]
[Black "Bolbochan, Julio"]
[Result "1/2-1/2"]
[ECO "E83"]
[EventDate "1965.03.19"]
[PlyCount "52"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Be3 Nc6 7. Nge2 a6 8. Qd2 Re8 9. h4 e5 10. d5 Na5 11. Ng3 c5 12. h5 Bd7 13. Bh6 Bxh6 14. Qxh6 Qe7 15. O-O-O b5 16. Be2 Nxc4 17. Bxc4 bxc4 18. Nf1 Kh8 19. hxg6 fxg6 20. Ne3 Rg8 21. Rh2 Rg7 22. Nxc4 Rf8 23. Qg5 Bb5 24. Ne3 Be8 25. Nc4 Bb5 26. Ne3 Be8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Najdorf, Miguel"]
[Black "Averbakh, Yuri"]
[Result "1/2-1/2"]
[ECO "E35"]
[EventDate "1965.03.19"]
[PlyCount "23"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 exd5 6. Bg5 h6 7. Bxf6 Qxf6 8. a3 Bxc3+ 9. Qxc3 O-O 10. Nf3 c6 11. e3 Bf5 12. Bd3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Panno, Oscar"]
[Black "Cruz, Raul Ceferino"]
[Result "1/2-1/2"]
[ECO "D58"]
[EventDate "1965.03.19"]
[PlyCount "36"]

1. Nf3 d5 2. c4 e6 3. d4 Nf6 4. Bg5 Be7 5. Nc3 O-O 6. Rc1 h6 7. Bh4 b6 8. cxd5 exd5 9. e3 Be6 10. Bd3 c5 11. O-O a6 12. Ne5 Nfd7 13. Bg3 Nxe5 14. dxe5 Nc6 15. Bb1 d4 16. exd4 Nxd4 17. Ne2 Nxe2+ 18. Qxe2 Qc8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Pilnik, Herman"]
[Black "Rossetto, Hector Decio"]
[Result "1-0"]
[ECO "C87"]
[EventDate "1965.03.19"]
[PlyCount "127"]

1. e4 Nc6 2. Nf3 e5 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. c3 Be7 7. Re1 b5 8. Bc2 O-O 9. h3 Nd7 10. a4 Bb7 11. d4 exd4 12. Nxd4 Bf6 13. Nf5 b4 14. a5 Rb8 15. Be3 Nde5 16. Nd2 bxc3 17. bxc3 Ne7 18. Nxe7+ Qxe7 19. f4 Ng6 20. Rb1 Bxc3 21. Rb3 Bxa5 22. Qb1 c5 23. e5 dxe5 24. f5 Bb4 25. fxg6 hxg6 26. Rf1 Rbd8 27. Ne4 Rd7 28. Rxb4 cxb4 29. Bc5 Qd8 30. Bxf8 Qxf8 31. Bb3 Bd5 32. Ng5 Bxb3 33. Qxb3 Qc5+ 34. Kh1 Qd5 35. Qxb4 f6 36. Ne4 Rb7 37. Qa4 Qb5 38. Qa2+ Kh7 39. Qf2 Rc7 40. Rd1 Rd7 41. Rc1 Qd5 42. Qh4+ Kg8 43. Nxf6+ gxf6 44. Qxf6 Qb7 45. Qxg6+ Rg7 46. Qe6+ Kh7 47. Qf5+ Kh6 48. Rc2 Rg6 49. Re2 Qd5 50. Qf8+ Kh7 51. Qe7+ Rg7 52. Qh4+ Kg8 53. Rb2 Qd6 54. Qc4+ Rf7 55. Qg4+ Rg7 56. Qc8+ Kh7 57. Qf5+ Kg8 58. Rf2 a5 59. Qc8+ Kh7 60. Rf8 Qd7 61. Rh8+ Kg6 62. Qa6+ Kf5 63. Rh5+ Rg5 64. g4+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.02"]
[Round "11"]
[White "Sanguineti, Raul"]
[Black "Palermo, Vicente"]
[Result "1-0"]
[ECO "C81"]
[EventDate "1965.03.19"]
[PlyCount "91"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Qe2 Nc5 10. Rd1 Nxb3 11. axb3 Qc8 12. c4 bxc4 13. bxc4 dxc4 14. Nbd2 Be7 15. Nxc4 O-O 16. Qe4 Nb4 17. Nd6 cxd6 18. Qxb4 Qc5 19. Qxc5 dxc5 20. Bg5 f6 21. exf6 gxf6 22. Bf4 Rfd8 23. h3 Bc4 24. Bc7 Rxd1+ 25. Rxd1 Bb5 26. Nh4 Rc8 27. Ba5 Rc6 28. Nf5 Bf8 29. Rd8 Re6 30. Bc3 Kf7 31. g4 Re8 32. Nd6+ Bxd6 33. Rxd6 Re6 34. Rd5 Rc6 35. f4 Bc4 36. Rh5 Kg8 37. Kf2 Bf7 38. Rf5 Kg7 39. h4 h6 40. h5 Be8 41. g5 hxg5 42. fxg5 Kh7 43. g6+ Kg7 44. Kg3 Bd7 45. Rxf6 Rxf6 46. Kh4 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Averbakh, Yuri"]
[Black "Pilnik, Herman"]
[Result "1-0"]
[ECO "B84"]
[EventDate "1965.03.19"]
[PlyCount "75"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. f4 Qc7 8. Bf3 e5 9. Nde2 Nbd7 10. a4 b6 11. O-O Bb7 12. Be3 Be7 13. Ng3 g6 14. f5 h5 15. fxg6 fxg6 16. Nd5 Qd8 17. c4 Rc8 18. Qb3 h4 19. Ne2 Bxd5 20. cxd5 Nc5 21. Qd1 a5 22. Nc3 h3 23. g3 Nh7 24. Be2 Bg5 25. Bb5+ Ke7 26. Bxg5+ Nxg5 27. Qg4 Rh5 28. Rf2 Qg8 29. Raf1 Rd8 30. Qe2 Rc8 31. Qe3 Qg7 32. g4 Rg8 33. Kh1 Qh6 34. gxh5 gxh5 35. Rf7+ Kd8 36. R1f6 Rg6 37. Rf8+ Kc7 38. Qxg5 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Bielicki, Carlos"]
[Black "Sanguineti, Raul"]
[Result "0-1"]
[ECO "E14"]
[EventDate "1965.03.19"]
[PlyCount "104"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. e3 Bb7 5. Bd3 d5 6. O-O Nbd7 7. b3 Bd6 8. Bb2 O-O 9. Nc3 a6 10. Qe2 Ne4 11. Qc2 f5 12. Ne2 Qe8 13. Ne5 Bxe5 14. dxe5 Nec5 15. cxd5 Bxd5 16. Nf4 Nxd3 17. Qxd3 Nc5 18. Qc3 Rf7 19. Ba3 Nb7 20. Rfd1 Rd8 21. Nxd5 Rxd5 22. Rxd5 exd5 23. Rd1 Rd7 24. Qd3 Qxe5 25. Qxa6 Nd8 26. Qc8 Qe6 27. g3 Kf7 28. b4 Ke8 29. Bb2 f4 30. Re1 f3 31. Qa6 g5 32. Qd3 Qh3 33. Qf1 Qxf1+ 34. Kxf1 c5 35. a3 Ne6 36. Rd1 g4 37. Bf6 Kf7 38. Bh4 c4 39. Ke1 b5 40. Kd2 Ra7 41. Ra1 d4 42. exd4 Nxd4 43. Kc3 Nb3 44. Rd1 Rxa3 45. Kb2 Ra4 46. Rd5 Rxb4 47. Kc3 Ra4 48. Rxb5 Nc1 49. Bg5 Ne2+ 50. Kd2 Ra2+ 51. Ke3 Ra3+ 52. Kd2 c3+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Bolbochan, Julio"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]
[ECO "E65"]
[EventDate "1965.03.19"]
[PlyCount "32"]

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. Nc3 Nc6 7. d4 d6 8. dxc5 dxc5 9. Be3 Be6 10. Bxc5 Qa5 11. Be3 Bxc4 12. Nd2 Be6 13. Qa4 Qxa4 14. Nxa4 Bd5 15. Nc3 Bxg2 16. Kxg2 Rfd8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Cruz, Raul Ceferino"]
[Black "Garcia, Raimundo"]
[Result "1/2-1/2"]
[ECO "E15"]
[EventDate "1965.03.19"]
[PlyCount "40"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. Nbd2 c5 6. Bg2 Nc6 7. dxc5 Bxc5 8. O-O O-O 9. a3 Be7 10. b4 Bb7 11. Bb2 Qc7 12. Qc2 d6 13. Rac1 Rac8 14. Rfd1 Qb8 15. Ne4 Nxe4 16. Qxe4 Ne5 17. Qf4 Nxf3+ 18. Bxf3 Bxf3 19. Qxf3 Rfd8 20. Qg4 Bf8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Foguelman, Alberto"]
[Black "Gheorghiu, Florin"]
[Result "0-1"]
[ECO "E62"]
[EventDate "1965.03.19"]
[PlyCount "82"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. Nc3 e5 8. dxe5 dxe5 9. Bg5 Be6 10. Qa4 h6 11. Rad1 Qc8 12. Bxf6 Bxf6 13. Nd5 Bd8 14. Nd2 f5 15. Nb3 Bf7 16. Nc5 e4 17. f3 Ne5 18. fxe4 c6 19. Nf4 Bb6 20. b4 Nxc4 21. exf5 Qxf5 22. Nfd3 Qg5 23. Kh1 Ne3 24. Ne4 Qe7 25. Ndc5 Nxf1 26. Rxf1 Bd5 27. Rd1 Rae8 28. Rd4 Qe5 29. Qd1 Rf7 30. a3 Bxc5 31. bxc5 Ref8 32. Kg1 Bxe4 33. Rxe4 Qxc5+ 34. Kh1 Qxa3 35. Rg4 Rf6 36. h4 Qe3 37. Kh2 Re8 38. Bf3 Rxf3 39. exf3 Qe2+ 40. Qxe2 Rxe2+ 41. Kh3 Kf7 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Palermo, Vicente"]
[Black "Najdorf, Miguel"]
[Result "0-1"]
[ECO "B87"]
[EventDate "1965.03.19"]
[PlyCount "64"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. O-O b5 8. Bb3 Bb7 9. Re1 Nbd7 10. Bg5 Nc5 11. Bd5 Qc7 12. Bxf6 gxf6 13. b4 Nd7 14. Bxb7 Qxb7 15. Qh5 Rc8 16. Re3 Ne5 17. a4 bxa4 18. Nxa4 Rb8 19. Rc3 Qd7 20. Qe2 Bh6 21. Qxa6 O-O 22. b5 Ra8 23. Qb6 d5 24. Rc7 Qd8 25. Ra7 Rxa7 26. Qxa7 dxe4 27. Nc6 Nxc6 28. bxc6 Qd2 29. Nc5 e3 30. Ne4 Qxc2 31. Nxf6+ Kg7 32. Qd4 Qxf2+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Rossetto, Hector Decio"]
[Black "Benko, Pal"]
[Result "1/2-1/2"]
[ECO "B07"]
[EventDate "1965.03.19"]
[PlyCount "23"]

1. d4 Nf6 2. Nc3 g6 3. e4 d6 4. f3 c6 5. Be3 Qb6 6. a3 Bg7 7. Kf2 O-O 8. Bc4 Qc7 9. Nge2 Nbd7 10. Qd2 d5 11. exd5 Nb6 12. Bb3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.04"]
[Round "12"]
[White "Stein, Leonid"]
[Black "Behrensen, Jorge"]
[Result "1-0"]
[ECO "B80"]
[EventDate "1965.03.19"]
[PlyCount "90"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. g3 Nc6 7. Bg2 Nf6 8. O-O d6 9. b3 Bd7 10. Bb2 Be7 11. Nce2 O-O 12. c4 Rfd8 13. Rc1 Qb6 14. Qd2 d5 15. exd5 exd5 16. Nxc6 bxc6 17. cxd5 cxd5 18. Bd4 Qb5 19. Qb2 Bf5 20. Nc3 Qa5 21. Na4 Rab8 22. Bc3 Qb5 23. Rfe1 Be6 24. Bf1 Qb7 25. Bd4 Ne8 26. Nc5 Bxc5 27. Rxc5 Rdc8 28. Rec1 Rxc5 29. Rxc5 Rc8 30. Qc3 Rxc5 31. Qxc5 Bd7 32. Bb2 Nc7 33. Qd6 Nb5 34. Qe7 Qc8 35. Qe5 d4 36. a4 f6 37. Qf4 Nc7 38. Qxd4 Ne6 39. Bc4 Kh8 40. Qb6 Bc6 41. Bxa6 Qa8 42. h4 h5 43. Bf1 Nf8 44. a5 Ng6 45. a6 Qc8 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Behrensen, Jorge"]
[Black "Rossetto, Hector Decio"]
[Result "0-1"]
[ECO "A29"]
[EventDate "1965.03.19"]
[PlyCount "166"]

1. c4 Nc6 2. Nc3 e5 3. g3 Nf6 4. Bg2 Bb4 5. Nf3 O-O 6. O-O Re8 7. Ne1 Bf8 8. d3 d6 9. Bg5 h6 10. Bd2 Bd7 11. Nc2 Qc8 12. Nd5 Nxd5 13. cxd5 Ne7 14. Rc1 Bh3 15. e4 Bxg2 16. Kxg2 c5 17. b4 cxb4 18. Bxb4 Qd7 19. Ne3 a5 20. Bd2 b5 21. Qb3 Reb8 22. Rc2 g6 23. Rfc1 Ra7 24. a4 b4 25. Nc4 Qd8 26. Be3 Rab7 27. f4 exf4 28. Bxf4 Rd7 29. h4 Bg7 30. Rf1 Kh7 31. Be3 f5 32. Rcf2 Rbb7 33. h5 g5 34. Bc1 Ra7 35. Bb2 Qh8 36. Bxg7 Qxg7 37. Ne3 f4 38. Ng4 Ng8 39. gxf4 gxf4 40. Rxf4 Nf6 41. Kh3 Nxh5 42. Rf5 Rf7 43. Qd1 Qg6 44. Qf3 Rxf5 45. exf5 Qg5 46. f6 Rf7 47. Qe4+ Qg6 48. Kh4 Rf8 49. f7 b3 50. Rf2 Qxe4 51. dxe4 Kg6 52. e5 Rxf7 53. Rb2 Rf4 54. Rxb3 dxe5 55. Kh3 Rxa4 56. Rb6+ Kf5 57. Nxh6+ Kf4 58. Kh4 Ng7 59. Rf6+ Ke4 60. d6 Rd4 61. Nf7 Ne8 62. Rh6 Kf5+ 63. Kh3 Nf6 64. Kg2 a4 65. Rh8 Ke6 66. Rf8 Nd7 67. Re8+ Kxf7 68. Re7+ Kf6 69. Rxd7 Ke6 70. Ra7 Kxd6 71. Ra5 Ke6 72. Kf3 Kf5 73. Ra8 Rd3+ 74. Ke2 Ra3 75. Rh8 Rb3 76. Rh5+ Ke6 77. Rh4 a3 78. Ra4 Kf5 79. Kf2 Rh3 80. Kg2 Rb3 81. Kf2 e4 82. Ra8 Ke5 83. Ke2 Kd4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Benko, Pal"]
[Black "Averbakh, Yuri"]
[Result "1/2-1/2"]
[ECO "C25"]
[EventDate "1965.03.19"]
[PlyCount "49"]

1. e4 e5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Nge2 Nge7 7. O-O O-O 8. f4 Nd4 9. fxe5 dxe5 10. Nxd4 exd4 11. Nd5 Nc6 12. Nf4 a5 13. Bd2 Ne5 14. Bh3 Bxh3 15. Nxh3 Qd7 16. Nf2 h5 17. h3 a4 18. Bf4 Ra6 19. Kg2 Rb6 20. Rb1 Qe6 21. b3 axb3 22. axb3 Ra6 23. Ra1 Rfa8 24. Rxa6 Rxa6 25. g4 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Garcia, Raimundo"]
[Black "Bolbochan, Julio"]
[Result "1/2-1/2"]
[ECO "C28"]
[EventDate "1965.03.19"]
[PlyCount "67"]

1. e4 e5 2. Bc4 Nf6 3. d3 Nc6 4. Nc3 Bb4 5. Nf3 d6 6. O-O Bxc3 7. bxc3 Be6 8. Bb5 a6 9. Bxc6+ bxc6 10. c4 c5 11. Ng5 Bg4 12. f3 Bh5 13. Qe1 Nd7 14. Qh4 Bg6 15. f4 exf4 16. Bxf4 O-O 17. Nf3 Qxh4 18. Nxh4 f6 19. Rab1 Rfb8 20. Bd2 Kf8 21. Ba5 Rxb1 22. Rxb1 Ra7 23. h3 Be8 24. Nf5 Ne5 25. Bc3 Nc6 26. g4 Bd7 27. Kf2 Bc8 28. Ne3 Ke8 29. h4 Rb7 30. Rxb7 Bxb7 31. Nd5 Kd8 32. g5 fxg5 33. hxg5 Nd4 34. Ne3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Gheorghiu, Florin"]
[Black "Stein, Leonid"]
[Result "0-1"]
[ECO "E20"]
[EventDate "1965.03.19"]
[PlyCount "42"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bd6 6. e4 c5 7. cxd5 exd5 8. e5 cxd4 9. Qxd4 Qe7 10. Bf4 Nc6 11. Bb5 O-O 12. Bxc6 Bc5 13. Nxd5 Nxd5 14. Qxd5 Rd8 15. Qe4 bxc6 16. Ne2 Ba6 17. Be3 Rd5 18. f4 Rad8 19. Bxc5 Qxc5 20. b4 Qb6 21. Rf1 Rd2 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Najdorf, Miguel"]
[Black "Bielicki, Carlos"]
[Result "1-0"]
[ECO "A14"]
[EventDate "1965.03.19"]
[PlyCount "73"]

1. Nf3 Nf6 2. c4 e6 3. g3 Be7 4. Bg2 O-O 5. O-O d5 6. b3 b6 7. Bb2 Bb7 8. e3 Nbd7 9. Nc3 c5 10. Qc2 a6 11. Rfd1 Rc8 12. d3 Rc7 13. Qe2 Qa8 14. Rac1 Rfc8 15. Nb1 Ne8 16. cxd5 Bxd5 17. e4 Bb7 18. Nbd2 b5 19. Bc3 a5 20. a4 bxa4 21. bxa4 Nb6 22. Ne5 Nxa4 23. Nec4 Nxc3 24. Rxc3 Rd8 25. Ra3 a4 26. Nb6 Qa6 27. Ndc4 Bc6 28. e5 Bb5 29. Rda1 Ra7 30. Qc2 Bxc4 31. Nxc4 Qb5 32. Rxa4 Rxa4 33. Rxa4 Qd7 34. Be4 g6 35. Qa2 Kf8 36. Ra7 Qb5 37. Rb7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Panno, Oscar"]
[Black "Foguelman, Alberto"]
[Result "1-0"]
[ECO "A13"]
[EventDate "1965.03.19"]
[PlyCount "77"]

1. Nf3 Nf6 2. c4 e6 3. g3 b6 4. Bg2 Bb7 5. O-O Be7 6. b3 O-O 7. Bb2 a5 8. Nc3 Ne4 9. Qc2 Nxc3 10. Bxc3 f5 11. Rfd1 Na6 12. d4 Be4 13. Qb2 Bb4 14. a3 Bxc3 15. Qxc3 Qe7 16. Ne5 Bxg2 17. Kxg2 d6 18. Nc6 Qe8 19. Qf3 Kh8 20. b4 g5 21. h3 a4 22. Rac1 Nb8 23. Nxb8 Rxb8 24. c5 bxc5 25. dxc5 d5 26. c6 Kg8 27. Rc5 Rf6 28. Qc3 Rh6 29. Qe5 Qh5 30. Rh1 Rf8 31. Ra5 f4 32. f3 fxg3 33. Ra7 Qg6 34. Rxc7 g4 35. hxg4 Rf7 36. Rc8+ Rf8 37. Rxf8+ Kxf8 38. Qf4+ Kg7 39. Qxh6+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Pilnik, Herman"]
[Black "Palermo, Vicente"]
[Result "0-1"]
[ECO "B43"]
[EventDate "1965.03.19"]
[PlyCount "84"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. g3 Nf6 7. Bg2 b5 8. a3 Bb7 9. O-O Nc6 10. Nde2 Be7 11. h3 d6 12. g4 h6 13. Be3 Ne5 14. f4 Nc4 15. Bc1 Qc5+ 16. Kh2 g5 17. b4 Qc7 18. Ng3 Rc8 19. Rf3 d5 20. exd5 Nxd5 21. Nxd5 Bxd5 22. Qd4 Rg8 23. Ne4 Qb6 24. Qd3 Rd8 25. Rb1 f5 26. gxf5 exf5 27. Ng3 Bxf3 28. Qxf3 Nd2 29. Bxd2 Rxd2 30. Re1 gxf4 31. Qa8+ Qd8 32. Qc6+ Qd7 33. Ne2 Qxc6 34. Bxc6+ Kd8 35. Bf3 Bh4 36. Rg1 Re8 37. Rg2 Re3 38. Nxf4 Rxg2+ 39. Kxg2 Rxa3 40. Ne6+ Ke7 41. Nd4 Kf6 42. Be2 Be1 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.05"]
[Round "13"]
[White "Sanguineti, Raul"]
[Black "Cruz, Raul Ceferino"]
[Result "0-1"]
[ECO "B49"]
[EventDate "1965.03.19"]
[PlyCount "114"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Be2 Nc6 7. O-O Nf6 8. Be3 b5 9. Nxc6 dxc6 10. f4 Be7 11. e5 Nd5 12. Nxd5 cxd5 13. Bd3 O-O 14. c3 Bd7 15. Bd4 Bc5 16. Rf3 f5 17. exf6 Rxf6 18. Qd2 Qb6 19. Qe3 Bxd4 20. cxd4 Rc8 21. Rh3 h6 22. Rd1 Qc7 23. Rf3 Be8 24. Rff1 Qd6 25. Bb1 Bg6 26. Qe5 Qd7 27. Bxg6 Rxg6 28. Rc1 Rf6 29. Rc5 Rf5 30. Rxc8+ Qxc8 31. Qe3 Rf6 32. Rc1 Qf8 33. g3 Qd6 34. Rc5 Rf8 35. Kg2 b4 36. h4 Qd7 37. Qe5 Rc8 38. Kf2 a5 39. Ke3 Kh7 40. b3 Rc6 41. f5 Rd6 42. g4 Kg8 43. Rxa5 Kh7 44. h5 Qd8 45. Rc5 Qh4 46. Kf3 Ra6 47. Rc2 Qh3+ 48. Qg3 Qf1+ 49. Rf2 Qd3+ 50. Kg2 Qxd4 51. f6 Ra8 52. g5 Qe4+ 53. Kh2 hxg5 54. Qxg5 gxf6 55. Rxf6 Rxa2+ 56. Kh3 Qh1+ 57. Kg3 Rg2+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Averbakh, Yuri"]
[Black "Behrensen, Jorge"]
[Result "1-0"]
[ECO "E50"]
[EventDate "1965.03.19"]
[PlyCount "67"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Nf3 c5 6. Be2 b6 7. O-O Nc6 8. d5 Bxc3 9. dxc6 Ba5 10. Qc2 d5 11. a3 Qd6 12. Rd1 Rd8 13. Rb1 Ne4 14. b4 cxb4 15. axb4 Bxb4 16. Rxb4 Qxb4 17. Qxe4 Ba6 18. Qh4 f6 19. Qg4 Re8 20. Nd4 f5 21. Qg3 Bxc4 22. Bh5 Re7 23. Qe5 g6 24. Bf3 Qc3 25. Bd2 Qb2 26. Qd6 Rae8 27. c7 Ba6 28. Be2 Qa2 29. Bxa6 Qxa6 30. Nc6 Rf7 31. Bc3 h5 32. Ne5 Rg7 33. Nd7 Rxd7 34. Qxd7 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Bielicki, Carlos"]
[Black "Pilnik, Herman"]
[Result "1/2-1/2"]
[ECO "D93"]
[EventDate "1965.03.19"]
[PlyCount "211"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 g6 5. Bf4 Bg7 6. e3 O-O 7. h3 Nbd7 8. cxd5 Nxd5 9. Nxd5 cxd5 10. Be2 Nf6 11. O-O Qb6 12. Qb3 Bf5 13. Rfc1 Rfc8 14. Kf1 Qxb3 15. axb3 a6 16. Ke1 Bd7 17. Ne5 Be8 18. Nd3 Bf8 19. Nc5 Bc6 20. Be5 Nd7 21. Nxd7 Bxd7 22. Bc7 e6 23. Ba5 Bd6 24. Kd2 Bc6 25. Rc2 Kf8 26. Rac1 Ke7 27. Bb6 Kd7 28. Bc5 Bc7 29. Bd3 h5 30. Ke2 h4 31. Bb4 g5 32. Bd2 f5 33. f3 Bd6 34. Rg1 Rg8 35. Rcc1 Rg7 36. Rce1 Rag8 37. Kd1 g4 38. hxg4 fxg4 39. f4 Bb5 40. Ke2 h3 41. Rh1 Rh7 42. Bxb5+ axb5 43. Rh2 Rc8 44. Reh1 Rc2 45. Kd3 Rxb2 46. Kc3 Ba3 47. gxh3 b4+ 48. Kd3 Rxb3+ 49. Kc2 Rb2+ 50. Kd3 Rxh3 51. Rxh3 gxh3 52. Rxh3 Ra2 53. Rh7+ Kc6 54. Rh6 b3 55. Rxe6+ Kb5 56. Bc3 Rg2 57. Re5 Kc6 58. Re6+ Kb5 59. Re5 b2 60. Bxb2 Rxb2 61. Rxd5+ Kc6 62. e4 b5 63. Rh5 Rb3+ 64. Kc2 Rb2+ 65. Kd3 b4 66. Kc4 Rf2 67. Rh6+ Kb7 68. Kb3 Rxf4 69. Re6 Rf1 70. d5 Rb1+ 71. Ka4 Bc1 72. Re7+ Kb6 73. Re6+ Kb7 74. Re7+ Kc8 75. Re8+ Kd7 76. Rb8 Bd2 77. e5 Re1 78. Rb7+ Kc8 79. Re7 Re3 80. d6 Rd3 81. Rf7 Kd8 82. Kb5 b3 83. Kc6 Rc3+ 84. Kd5 Kc8 85. e6 b2 86. e7 Rd3+ 87. Kc6 Rc3+ 88. Kd5 Rd3+ 89. Kc6 Rc3+ 90. Kd5 Kd7 91. Rf8 Rd3+ 92. Kc5 Re3 93. Kd5 Ba5 94. Rb8 Re2 95. e8=Q+ Rxe8 96. Rxb2 Re1 97. Rb7+ Kc8 98. Rh7 Bb4 99. Rh4 Rd1+ 100. Rd4 Rb1 101. Rc4+ Kb7 102. Rg4 Kb6 103. Rd4 Bc5 104. Rd3 Kb5 105. Ke6 Re1+ 106. Kd7 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Bolbochan, Julio"]
[Black "Sanguineti, Raul"]
[Result "1/2-1/2"]
[ECO "E15"]
[EventDate "1965.03.19"]
[PlyCount "42"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Ba6 5. Qa4 Be7 6. Bg2 c6 7. Nc3 O-O 8. O-O d5 9. cxd5 cxd5 10. Ne5 Bb7 11. Bf4 Nfd7 12. Rfd1 f5 13. Nxd7 Qxd7 14. Qxd7 Nxd7 15. Nb5 g5 16. Bd6 Kf7 17. Rac1 Rfc8 18. Bxe7 Kxe7 19. e3 a6 20. Nc3 Rc6 21. Ne2 Rac8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Cruz, Raul Ceferino"]
[Black "Najdorf, Miguel"]
[Result "0-1"]
[ECO "E24"]
[EventDate "1965.03.19"]
[PlyCount "76"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 Qa5 7. Qd2 Nc6 8. e3 d6 9. Bd3 O-O 10. Ne2 e5 11. d5 e4 12. dxc6 exd3 13. Qxd3 bxc6 14. O-O Ba6 15. e4 d5 16. Bg5 Bxc4 17. Qc2 Nd7 18. Rfe1 Rfe8 19. Ng3 g6 20. f4 Rab8 21. f5 Qc7 22. Qd2 f6 23. Bf4 Ne5 24. fxg6 hxg6 25. exd5 cxd5 26. Re3 Rb6 27. Rae1 Rbe6 28. Qf2 Qg7 29. Bxe5 fxe5 30. Rb1 e4 31. Qf4 Qf7 32. Qg4 Bd3 33. Rc1 Rf8 34. Ree1 Rf6 35. h4 Kh7 36. Qg5 Qc7 37. h5 Qf4 38. hxg6+ Rxg6 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Foguelman, Alberto"]
[Black "Garcia, Raimundo"]
[Result "1/2-1/2"]
[ECO "E67"]
[EventDate "1965.03.19"]
[PlyCount "128"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nbd7 7. Qc2 e5 8. Rd1 Re8 9. Nc3 c6 10. Bg5 Qa5 11. d5 c5 12. Nb5 Bf8 13. Qd2 Qd8 14. a4 a6 15. Nc3 Be7 16. e4 Nh5 17. Bxe7 Qxe7 18. a5 Ndf6 19. Re1 Bd7 20. Ra3 Rab8 21. Rb3 Red8 22. Re2 Bg4 23. h3 Bxf3 24. Bxf3 Ng7 25. Qg5 Nxd5 26. Qxe7 Nxe7 27. Nd5 Nc6 28. Ra3 Ne8 29. Re1 Kg7 30. Bd1 Nf6 31. Nb6 Ng8 32. Kg2 Nge7 33. f4 f6 34. Rf1 Nd4 35. b3 h6 36. Ra2 g5 37. Raf2 exf4 38. gxf4 Ne6 39. fxg5 hxg5 40. Bg4 Nf4+ 41. Rxf4 gxf4 42. Nd7 f5 43. exf5 Rxd7 44. f6+ Kxf6 45. Bxd7 Rd8 46. Bg4 Kg5 47. Rd1 Nc6 48. Rd5+ Kh6 49. Bd1 Nxa5 50. Kf3 Nc6 51. Kxf4 Ne5 52. Kf5 Ng6 53. Ke6 Nf4+ 54. Ke7 Nxd5+ 55. Kxd8 Nc3 56. Bf3 b5 57. Kc7 bxc4 58. bxc4 a5 59. Bc6 a4 60. Bxa4 Nxa4 61. Kxd6 Kh5 62. Kc6 Kh4 63. Kb5 Nb2 64. Kxc5 Nxc4 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Gheorghiu, Florin"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]
[ECO "C93"]
[EventDate "1965.03.19"]
[PlyCount "122"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 h6 10. d4 Re8 11. Nbd2 Bf8 12. Nf1 Bb7 13. Ng3 Na5 14. Bc2 g6 15. Nh2 Bg7 16. f4 exf4 17. Bxf4 c5 18. b3 Nc6 19. Nf3 Nh7 20. d5 Ne5 21. Nxe5 Bxe5 22. Qd2 Qh4 23. Rf1 Bxf4 24. Qxf4 Qxf4 25. Rxf4 Kg7 26. Raf1 Re7 27. h4 Bc8 28. b4 cxb4 29. cxb4 Bd7 30. Ne2 Rc8 31. Bb3 f6 32. Nd4 g5 33. R4f2 Rxe4 34. Ne6+ Kg8 35. hxg5 hxg5 36. Rc2 Rxc2 37. Bxc2 Rh4 38. g3 Rh3 39. Kg2 g4 40. Bxh7+ Rxh7 41. Rxf6 Re7 42. Nf4 Re3 43. Rxd6 Bf5 44. Rxa6 Rf3 45. Ra8+ Kf7 46. Ne6 Bxe6 47. dxe6+ Kxe6 48. Rg8 Ra3 49. Rxg4 Rxa2+ 50. Kh3 Rb2 51. Rf4 Rb3 52. Kg4 Kd5 53. Kh4 Ke5 54. Rg4 Kf6 55. Kh5 Ke5 56. Kg5 Ke6 57. Kh4 Kd5 58. Rf4 Ke5 59. Kg4 Kd5 60. Kh3 Ke6 61. Kh4 Ke5 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Palermo, Vicente"]
[Black "Benko, Pal"]
[Result "0-1"]
[ECO "B83"]
[EventDate "1965.03.19"]
[PlyCount "74"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. O-O O-O 8. Kh1 Nc6 9. f4 Qc7 10. Nb3 Rd8 11. Qe1 a6 12. Be3 b5 13. a3 Rb8 14. g4 b4 15. axb4 Nxb4 16. Qb1 Bb7 17. Bf3 d5 18. exd5 Nbxd5 19. Nxd5 Nxd5 20. Bd2 Bb4 21. c3 Bd6 22. Na5 Ba8 23. Qc1 Nf6 24. h3 h5 25. Bxa8 Rxa8 26. Rg1 hxg4 27. hxg4 Qc5 28. Be3 Qd5+ 29. Kh2 Qf3 30. Rg3 Nxg4+ 31. Kh3 Nf2+ 32. Kh2 Qh5+ 33. Kg2 Ne4 34. Rh3 Qg4+ 35. Kh2 Qe2+ 36. Kh1 Bxf4 37. Bxf4 Rd1+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.07"]
[Round "14"]
[White "Stein, Leonid"]
[Black "Rossetto, Hector Decio"]
[Result "1-0"]
[ECO "C94"]
[EventDate "1965.03.19"]
[PlyCount "51"]

1. e4 Nc6 2. Nf3 e5 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Nb8 10. d3 c5 11. Nbd2 Qc7 12. Nf1 Nc6 13. Ng3 Bd7 14. d4 cxd4 15. cxd4 Rac8 16. Re2 Na5 17. Bc2 h6 18. b3 Nc6 19. Bb2 Nh7 20. Rd2 Ng5 21. dxe5 Nxf3+ 22. gxf3 Nb8 23. exd6 Bxd6 24. Rxd6 Qxc2 25. Qd4 f6 26. Rc1 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Behrensen, Jorge"]
[Black "Palermo, Vicente"]
[Result "0-1"]
[ECO "A81"]
[EventDate "1965.03.19"]
[PlyCount "64"]

1. d4 f5 2. Nf3 Nf6 3. g3 d6 4. b3 e6 5. Bg2 Be7 6. O-O O-O 7. Bb2 a5 8. Nbd2 a4 9. c4 Qe8 10. e3 Nc6 11. Ne1 Nd8 12. Nd3 Rb8 13. b4 b5 14. c5 Bb7 15. f3 g5 16. e4 fxe4 17. fxe4 Qg6 18. Qe2 Nf7 19. c6 Bxc6 20. Rac1 Ba8 21. Rxc7 Bd8 22. Rcc1 Bb6 23. Kh1 Rbe8 24. e5 Bxg2+ 25. Kxg2 dxe5 26. dxe5 Nd5 27. Nc5 Nh6 28. Nde4 Ng4 29. Bd4 Bxc5 30. bxc5 Nge3+ 31. Bxe3 Qxe4+ 32. Kh3 g4+ 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Benko, Pal"]
[Black "Bielicki, Carlos"]
[Result "1-0"]
[ECO "C00"]
[EventDate "1965.03.19"]
[PlyCount "77"]

1. g3 Nf6 2. Bg2 d5 3. Nf3 e6 4. O-O Be7 5. d3 O-O 6. Nbd2 c5 7. e4 Nc6 8. Re1 b6 9. e5 Nd7 10. c3 Rb8 11. Nf1 b5 12. h4 c4 13. d4 b4 14. Qc2 Re8 15. Ng5 Nf8 16. Ne3 Ba6 17. f4 bxc3 18. bxc3 h6 19. Nf3 Qa5 20. f5 Ba3 21. f6 Nd7 22. fxg7 Kxg7 23. Ng4 Bxc1 24. Qxc1 Rh8 25. Rf1 Rbg8 26. Nf6 Nxf6 27. exf6+ Kf8 28. Qf4 Qd8 29. Ne5 Nxe5 30. Qxe5 Ke8 31. Bh3 Bc8 32. Rab1 Qd7 33. Rb8 Kd8 34. Rfb1 Qc7 35. Kf2 Qxe5 36. dxe5 Kc7 37. Ra8 Bb7 38. Rxa7 Rb8 39. Bg4 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Garcia, Raimundo"]
[Black "Gheorghiu, Florin"]
[Result "0-1"]
[ECO "A56"]
[EventDate "1965.03.19"]
[PlyCount "48"]

1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 Be7 6. Nf3 O-O 7. Be2 Ne8 8. O-O g6 9. Bh6 Ng7 10. Qd2 Bg4 11. Ne1 Bxe2 12. Nxe2 f5 13. Nc3 f4 14. f3 Rf7 15. Bxg7 Rxg7 16. Nd3 h5 17. g4 hxg4 18. fxg4 Nd7 19. Ne1 Rh7 20. Kg2 Nf6 21. h3 Qd7 22. Qe2 Kg7 23. Nd1 Rah8 24. Nf2 Nxg4 0-1

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Najdorf, Miguel"]
[Black "Bolbochan, Julio"]
[Result "1/2-1/2"]
[ECO "D36"]
[EventDate "1965.03.19"]
[PlyCount "42"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 O-O 6. cxd5 exd5 7. e3 c6 8. Qc2 Bg4 9. Ne5 Be6 10. Bd3 h6 11. Bh4 Nbd7 12. Nxd7 Nxd7 13. Bg3 Bh4 14. O-O Bxg3 15. hxg3 Qe7 16. Rab1 h5 17. Ne2 h4 18. Bh7+ Kh8 19. Bf5 hxg3 20. Nxg3 g6 21. Bxe6 Qxe6 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Panno, Oscar"]
[Black "Stein, Leonid"]
[Result "1/2-1/2"]
[ECO "D41"]
[EventDate "1965.03.19"]
[PlyCount "34"]

1. Nf3 Nf6 2. c4 e6 3. Nc3 d5 4. d4 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Be2 b6 12. O-O Bb7 13. Qe3 Nd7 14. a4 Rc8 15. Nd2 Nf6 16. f3 Qc7 17. Nc4 Rfd8 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Pilnik, Herman"]
[Black "Cruz, Raul Ceferino"]
[Result "1-0"]
[ECO "B48"]
[EventDate "1965.03.19"]
[PlyCount "113"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 Qc7 6. Bd3 Nc6 7. Be3 b5 8. Nxc6 Qxc6 9. O-O Bb7 10. Re1 Nf6 11. Bg5 Be7 12. a3 O-O 13. Qf3 h6 14. Bf4 d6 15. Rad1 Nd7 16. Nd5 Bd8 17. Nb4 Qc5 18. Qg3 Ne5 19. Bxh6 Bf6 20. Be3 Qc7 21. Bg5 Bxg5 22. Qxg5 Qc5 23. Qd2 a5 24. Na2 Rfd8 25. b4 axb4 26. axb4 Qc6 27. Nc3 Nc4 28. Qc1 Rac8 29. Ne2 Qb6 30. Ng3 Ne5 31. Nh5 g6 32. Qg5 Kf8 33. Nf6 Kg7 34. h4 Rh8 35. h5 Rh6 36. Re3 Rch8 37. g4 Qd8 38. f4 Nxd3 39. Rdxd3 Qb6 40. Nd7 Qc7 41. Qf6+ Kg8 42. Qe7 Kg7 43. f5 Ra8 44. Qf6+ Kg8 45. fxe6 fxe6 46. Qxe6+ Kh8 47. Qf6+ Kg8 48. Rxd6 Qxc2 49. Qe6+ Kh8 50. Qe5+ Kg8 51. Re1 Qb3 52. Nf6+ Kf8 53. Qf4 g5 54. Nd7+ Ke7 55. Qe5+ Kf7 56. Rf1+ Kg8 57. Qxg5+ 1-0

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Rossetto, Hector Decio"]
[Black "Averbakh, Yuri"]
[Result "1/2-1/2"]
[ECO "D01"]
[EventDate "1965.03.19"]
[PlyCount "85"]

1. d4 Nf6 2. Nc3 d5 3. Bg5 Bf5 4. e3 e6 5. Bd3 Bxd3 6. cxd3 Be7 7. Qb3 b6 8. Nf3 O-O 9. O-O h6 10. Bh4 Nbd7 11. Rac1 c5 12. h3 a6 13. a4 Rc8 14. Bg3 c4 15. Qd1 Bb4 16. Na2 Qe7 17. Bh4 g5 18. Bg3 b5 19. axb5 axb5 20. h4 Nh7 21. hxg5 hxg5 22. Ne5 Nxe5 23. dxe5 Ra8 24. Nc3 Bxc3 25. bxc3 cxd3 26. Qxd3 Qc5 27. Rb1 Ra3 28. Rxb5 Qxc3 29. Qxc3 Rxc3 30. Ra1 Rfc8 31. Rb7 Rc1+ 32. Rxc1 Rxc1+ 33. Kh2 Rc4 34. Kh3 Nf8 35. Rb3 Ng6 36. f3 Kg7 37. Rd3 Kh6 38. Rd4 Rxd4 39. exd4 Kh5 40. Bh2 Nf4+ 41. Bxf4 gxf4 42. g4+ fxg3 43. Kxg3 1/2-1/2

[Event "21st Mar del Plata it"]
[Site "Mar del Plata ARG"]
[Date "1965.04.08"]
[Round "15"]
[White "Sanguineti, Raul"]
[Black "Foguelman, Alberto"]
[Result "1/2-1/2"]
[ECO "E24"]
[EventDate "1965.03.19"]
[PlyCount "118"]

1. c4 Nf6 2. Nc3 e6 3. d4 Bb4 4. f3 O-O 5. e4 d6 6. a3 Bxc3+ 7. bxc3 Nc6 8. Bd3 e5 9. Ne2 b6 10. Be3 Na5 11. Ng3 Be6 12. Qe2 Qe8 13. Bg5 Kh8 14. Bxf6 gxf6 15. Nh5 Qe7 16. f4 exd4 17. O-O Rg8 18. f5 Bd7 19. cxd4 Nb3 20. h4 Nxd4 21. Qe3 Qe5 22. Qh6 Nf3+ 23. Rxf3 Qxa1+ 24. Bf1 Qe5 25. Nxf6 Rg7 26. Nxd7 Qxe4 27. Rf4 Qe3+ 28. Kh1 f6 29. Nxf6 Rf7 30. Nd5 Qxa3 31. Ne7 Qc1 32. f6 Qe3 33. Qh5 Rxe7 34. fxe7 Qxf4 35. e8=Q+ Rxe8 36. Qxe8+ Kg7 37. Qe7+ Kg8 38. Bd3 h6 39. Bh7+ Kh8 40. Bg6 Kg8 41. Qh7+ Kf8 42. Qh8+ Ke7 43. Qe8+ Kf6 44. Qf7+ Ke5 45. Qg7+ Ke6 46. Qg8+ Ke5 47. Qd5+ Kf6 48. Qf7+ Ke5 49. Qxf4+ Kxf4 50. Kh2 c6 51. g3+ Ke5 52. Kg2 a5 53. Bc2 b5 54. cxb5 cxb5 55. Bd3 a4 56. Bxb5 a3 57. Bc4 d5 58. Ba2 Ke4 59. Kf2 d4 1/2-1/2
