[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Andersson, Ulf"]
[Black "Ree, Hans"]
[WhiteElo "2555"]
[BlackElo "2440"]
[Result "1/2-1/2"]
[ECO "D79"]
[EventDate "1973.07.10"]
[PlyCount "46"]

1.Nf3 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.O-O c6 6.Nc3 d5 7.cxd5 cxd5 8.d4 
Nc6 9.Ne5 e6 10.Bf4 Nxe5 11.Bxe5 Bd7 12.Qb3 Bc6 13.e3 Qe7 14.Rfc1 Rfc8 15.
Bf1 Bf8 16.Bxf6 Qxf6 17.Rc2 Qd8 18.Rac1 Qd7 19.Bb5 Bxb5 20.Nxb5 Rxc2 21.
Rxc2 a6 22.Nc3 Rc8 23.Ne2 b5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Kavalek, Lubomir"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2565"]
[BlackElo "2520"]
[Result "1/2-1/2"]
[ECO "B92"]
[EventDate "1973.07.10"]
[PlyCount "32"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 Nbd7 7.Be3 Nc5 8.Bf3 
e6 9.Nb3 Qc7 10.Qd2 Ncd7 11.a4 Ne5 12.Be2 b6 13.Qd4 Nfd7 14.f4 Nc6 15.Qd2 
Be7 16.O-O O-O 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Langeweg, Christian"]
[Black "Donner, Jan"]
[WhiteElo "2430"]
[BlackElo "2480"]
[Result "0-1"]
[ECO "A33"]
[EventDate "1973.07.10"]
[PlyCount "70"]

1.Nf3 c5 2.c4 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.g3 Bb4 7.Bg2 O-O 8.O-O 
d5 9.cxd5 exd5 10.Be3 Be6 11.Rc1 Qe7 12.Nxc6 bxc6 13.Na4 Qb7 14.Bc5 Bxc5 
15.Nxc5 Qb6 16.Qd4 Bf5 17.Rfd1 Rfe8 18.e3 Rac8 19.Rd2 h6 20.f3 Nd7 21.Nxd7
Bxd7 22.Rc5 Re7 23.b4 Rce8 24.Rd3 Bc8 25.b5 cxb5 26.Rxd5 Be6 27.Qxb6 axb6 
28.Rd6 Bc4 29.Rc3 Rxe3 30.Rxe3 Rxe3 31.Rxb6 Re1+ 32.Kf2 Re2+ 33.Kg1 Rxa2 
34.f4 Kf8 35.Rb7 Rxg2+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Marovic, Drazen"]
[Black "Radulov, Ivan"]
[WhiteElo "2480"]
[BlackElo "2530"]
[Result "1/2-1/2"]
[ECO "D24"]
[EventDate "1973.07.10"]
[PlyCount "58"]

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Nc3 c5 5.d5 e6 6.e4 exd5 7.e5 Nfd7 8.Bg5 Be7
9.Bxe7 Qxe7 10.Nxd5 Qd8 11.Bxc4 O-O 12.O-O Nc6 13.Re1 Re8 14.Nc3 Nb6 15.
Bd3 Bg4 16.h3 Bxf3 17.Qxf3 c4 18.Be4 Nxe5 19.Bxh7+ Kxh7 20.Qh5+ Kg8 21.
Rxe5 Qd2 22.Rb1 Rxe5 23.Qxe5 Qc2 24.Qb5 Rd8 25.Re1 Qg6 26.Re8+ Rxe8 27.
Qxe8+ Kh7 28.Qe7 Qe6 29.Qh4+ Kg8 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Petrosian, Tigran"]
[Black "Szabo, Laszlo"]
[WhiteElo "2640"]
[BlackElo "2565"]
[Result "1-0"]
[ECO "A34"]
[EventDate "1973.07.10"]
[PlyCount "65"]

1.c4 Nf6 2.Nc3 c5 3.g3 d5 4.cxd5 Nxd5 5.Bg2 Nc7 6.d3 e5 7.Nf3 Nc6 8.Nd2 
Be6 9.Bxc6+ bxc6 10.b3 Nb5 11.Na4 Qd5 12.f3 Be7 13.Bb2 h5 14.Rc1 h4 15.g4 
Bxg4 16.e4 Qxd3 17.fxg4 Bg5 18.Nxc5 Qh3 19.Qe2 Rd8 20.Rc2 Bf4 21.Nf1 Rh6 
22.Qg2 Qxg2 23.Rxg2 Rhd6 24.Rc2 Rd1+ 25.Ke2 Rb1 26.a4 Nc7 27.Ng3 Rxb2 28.
Rxb2 hxg3 29.hxg3 Bxg3 30.Rh8+ Ke7 31.Rxd8 Kxd8 32.Rd2+ Ke8 33.Rd6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Planinc, Albin"]
[Black "Smejkal, Jan"]
[WhiteElo "2525"]
[BlackElo "2595"]
[Result "1/2-1/2"]
[ECO "C98"]
[EventDate "1973.07.10"]
[PlyCount "73"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d6 
9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6 13.dxc5 dxc5 14.Nf1 Be6 15.Ne3 
Rad8 16.Qe2 c4 17.Nf5 Bxf5 18.exf5 Rfe8 19.Bg5 h6 20.Bxf6 Bxf6 21.Nd2 Ne7 
22.Ne4 Nd5 23.Rad1 Be7 24.Ng3 Nf6 25.Rxd8 Rxd8 26.Ne4 Nxe4 27.Qxe4 Rd2 28.
g3 Bc5 29.Re2 Rxe2 30.Qxe2 Bb6 31.Kf1 Kf8 32.Qf3 Ke7 33.Ke2 Qc5 34.Qb7+ 
Kf6 35.Qf3 a5 36.g4 Ke7 37.Qb7+ 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Ribli, Zoltan"]
[Black "Spassky, Boris"]
[WhiteElo "2525"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "B83"]
[EventDate "1973.07.10"]
[PlyCount "34"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 Nc6 7.Be3 e6 8.O-O 
Be7 9.f4 O-O 10.a4 Bd7 11.Nb3 b6 12.Bf3 Rc8 13.g4 Be8 14.Qe2 Nb4 15.g5 Nd7
16.Qg2 Kh8 17.Kh1 Nc5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "1"]
[White "Timman, Jan"]
[Black "Enklaar, Bertus"]
[WhiteElo "2470"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "A05"]
[EventDate "1973.07.10"]
[PlyCount "63"]

1.Nf3 Nf6 2.g3 g6 3.b3 d5 4.Bb2 c5 5.c4 d4 6.b4 Bg7 7.Bg2 O-O 8.O-O Nfd7 
9.d3 Nc6 10.a3 a5 11.b5 Nce5 12.Nbd2 f5 13.Qc2 Nf7 14.e3 dxe3 15.fxe3 e5 
16.Rae1 Nb6 17.e4 f4 18.gxf4 exf4 19.Bxg7 Kxg7 20.Qc3+ Kg8 21.e5 Qe7 22.
Ne4 Be6 23.Nf6+ Kg7 24.Nd2 g5 25.h4 h6 26.Nd5 Qd8 27.hxg5 hxg5 28.Nb3 Nd7 
29.d4 cxd4 30.Nxd4 Nc5 31.b6 Qd7 32.Nf5+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Donner, Jan"]
[Black "Planinc, Albin"]
[WhiteElo "2480"]
[BlackElo "2525"]
[Result "0-1"]
[ECO "A73"]
[EventDate "1973.07.10"]
[PlyCount "70"]

1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.e4 Bg7 8.Be2 O-O 
9.O-O Bg4 10.Bf4 Re8 11.Qc2 a6 12.a4 Qe7 13.Rfe1 Nbd7 14.h3 Bxf3 15.Bxf3 
c4 16.a5 Nc5 17.Re2 Nfd7 18.Ra3 Nb3 19.Qd1 Ne5 20.Bxe5 Bxe5 21.Na4 Nd4 22.
Re1 Nb5 23.Ra1 Rac8 24.Rc1 Bd4 25.Re2 Qd8 26.Rec2 Qxa5 27.Rxc4 Rxc4 28.
Rxc4 Bg7 29.b4 Qd8 30.g3 Na3 31.Rc1 b5 32.Nc3 Qb6 33.Be2 Bd4 34.Qb3 Bxf2+ 
35.Kg2 Qe3 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Enklaar, Bertus"]
[Black "Ribli, Zoltan"]
[WhiteElo "2445"]
[BlackElo "2525"]
[Result "0-1"]
[ECO "B89"]
[EventDate "1973.07.10"]
[PlyCount "94"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 e6 7.Be3 Be7 8.Qe2 
a6 9.O-O-O Qc7 10.Rhg1 O-O 11.Bb3 Na5 12.g4 b5 13.g5 Nxb3+ 14.axb3 Nd7 15.
Qh5 g6 16.Qh6 Re8 17.Rg3 Bf8 18.Qh4 b4 19.Nb1 Bg7 20.Nd2 Bb7 21.Rh3 Rac8 
22.Nc4 Nf8 23.Qg3 e5 24.Ne2 Bxe4 25.Bb6 Qb8 26.Qe3 d5 27.Rh4 Ne6 28.Rxe4 
dxe4 29.Nd6 Nd4 30.Nxc8 Rxc8 31.Nxd4 exd4 32.Bxd4 Bxd4 33.Rxd4 Qxh2 34.
Rxe4 Qg1+ 35.Qe1 Qxg5+ 36.f4 Qa5 37.Re8+ Rxe8 38.Qxe8+ Kg7 39.Qe4 Qc5 40.
Kd2 h5 41.Ke2 h4 42.Kf3 Qh5+ 43.Kf2 h3 44.Kg3 h2 45.Qh1 g5 46.Qxh2 gxf4+ 
47.Kg2 Qd5+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Marovic, Drazen"]
[Black "Andersson, Ulf"]
[WhiteElo "2480"]
[BlackElo "2555"]
[Result "1-0"]
[ECO "E38"]
[EventDate "1973.07.10"]
[PlyCount "111"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 Na6 6.a3 Bxc3+ 7.Qxc3 Nxc5 8.f3
a5 9.e4 d6 10.Be3 Qc7 11.Rd1 e5 12.Qd2 Be6 13.Qxd6 Qxd6 14.Rxd6 Nfd7 15.
Rd1 Nb3 16.Ne2 Bxc4 17.Nc3 Bxf1 18.Rxf1 O-O-O 19.Rd5 b6 20.Ke2 Rhe8 21.Nb5
Nf6 22.Nd6+ Kb8 23.Rd3 Re6 24.Rfd1 Nd4+ 25.Bxd4 exd4 26.Rxd4 Rd7 27.Nf5 
Rxd4 28.Nxd4 Re8 29.Nf5 g6 30.Nd6 Re7 31.Nc4 Nd7 32.Ne3 Nc5 33.Rd6 Re6 34.
Rxe6 fxe6 35.Kd2 Kc7 36.Nc4 Nb7 37.Ne5 Kd6 38.Nd3 Nd8 39.Kc3 Nc6 40.Kc4 
Na7 41.e5+ Kc6 42.Nf4 Kd7 43.h4 Ke7 44.Ne2 Kd7 45.Nd4 Ke7 46.g4 Kd7 47.f4 
Ke7 48.Nb5 Nc8 49.Nc3 Kd7 50.Ne4 h6 51.Nf6+ Kc6 52.Nh7 b5+ 53.Kd4 h5 54.
gxh5 gxh5 55.Nf8 Ne7 56.Nxe6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Quinteros, Miguel Angel"]
[Black "Petrosian, Tigran"]
[WhiteElo "2520"]
[BlackElo "2640"]
[Result "1/2-1/2"]
[ECO "B06"]
[EventDate "1973.07.10"]
[PlyCount "31"]

1.Nf3 g6 2.e4 Bg7 3.d4 d6 4.c3 Nf6 5.Qc2 O-O 6.Bg5 Nc6 7.Nbd2 h6 8.Bh4 a6 
9.a4 Nh5 10.Bc4 g5 11.Bg3 e6 12.O-O Kh8 13.d5 exd5 14.Bxd5 Ne7 15.Bc4 Ng6 
16.Nd4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Radulov, Ivan"]
[Black "Szabo, Laszlo"]
[WhiteElo "2530"]
[BlackElo "2565"]
[Result "0-1"]
[ECO "A04"]
[EventDate "1973.07.10"]
[PlyCount "84"]

1.e4 c5 2.Nf3 e6 3.d3 Nc6 4.g3 g6 5.Bg2 Bg7 6.O-O Nge7 7.c3 d5 8.Qe2 b6 9.
Nbd2 Ba6 10.e5 h6 11.h4 Nf5 12.Rd1 Qc7 13.Re1 g5 14.hxg5 hxg5 15.Nf1 g4 
16.N3h2 Qxe5 17.Qd1 Qd6 18.Bf4 Qd7 19.Nxg4 Bb7 20.Bg5 d4 21.Nf6+ Bxf6 22.
Bxf6 Rh6 23.Bg5 Rh7 24.Nh2 Nce7 25.Ng4 Ng8 26.Be4 Bxe4 27.dxe4 Qb7 28.Nf6+
Nxf6 29.Bxf6 Ne3 30.fxe3 Qxe4 31.Bh4 Rxh4 32.gxh4 Ke7 33.Kf2 Qxh4+ 34.Ke2 
dxe3 35.Rf1 Rd8 36.Qe1 Qc4+ 37.Kf3 e2 38.Qxe2 Rd3+ 39.Kg2 Rg3+ 40.Kxg3 
Qxe2 41.Rf2 Qe3+ 42.Kg2 f5 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Ree, Hans"]
[Black "Langeweg, Christian"]
[WhiteElo "2440"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "A07"]
[EventDate "1973.07.10"]
[PlyCount "34"]

1.Nf3 Nf6 2.g3 d5 3.Bg2 c6 4.b3 Bf5 5.Ba3 Nbd7 6.O-O e6 7.Bxf8 Nxf8 8.c4 
N8d7 9.Nc3 O-O 10.d3 Qe7 11.Nh4 Bg4 12.h3 Bh5 13.Qd2 Ne8 14.cxd5 cxd5 15.
Nf3 Bxf3 16.Bxf3 Nd6 17.Rfc1 Rfc8 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Smejkal, Jan"]
[Black "Timman, Jan"]
[WhiteElo "2595"]
[BlackElo "2470"]
[Result "1-0"]
[ECO "B36"]
[EventDate "1973.07.10"]
[PlyCount "180"]

1.c4 c5 2.Nf3 g6 3.d4 cxd4 4.Nxd4 Nc6 5.e4 Nf6 6.Nc3 Nxd4 7.Qxd4 d6 8.c5 
Bg7 9.Bb5+ Bd7 10.cxd6 Bxb5 11.Nxb5 Qa5+ 12.Nc3 O-O 13.e5 Nh5 14.dxe7 Rfe8
15.f4 Rxe7 16.O-O Rd8 17.Qf2 f5 18.Be3 b6 19.Rad1 Red7 20.Qe2 Qb4 21.Rxd7 
Rxd7 22.Rd1 Rxd1+ 23.Qxd1 Bf8 24.Qb3+ Qxb3 25.axb3 Kf7 26.g3 Ke6 27.Nb5 a6
28.Nc7+ Kd7 29.Nxa6 Kc6 30.Bd2 Kb7 31.Nb4 Bxb4 32.Bxb4 Ng7 33.Kf2 Kc6 34.
Ke3 Kd5 35.Kd3 Ne6 36.Bd6 Nd4 37.Bc7 b5 38.Bb6 Nc6 39.Kc3 Ke6 40.Bc5 Kd5 
41.Bf8 Ke6 42.Bh6 Kd5 43.h3 Ke6 44.g4 Kd5 45.gxf5 gxf5 46.Bg5 Ke6 47.Bf6 
Kd5 48.Bh4 Ke6 49.Bf2 Kd5 50.Bh4 Ke6 51.Bf2 Kd5 52.Bb6 Ke4 53.Bc5 Kd5 54.
Bd6 Ke6 55.Kd3 Kd5 56.Bc7 Nb4+ 57.Ke3 Nc2+ 58.Kd2 Nd4 59.Bb6 Ne6 60.Ke3 
Kc6 61.Ba5 Kd5 62.Bc3 Nc5 63.Bd4 Ne6 64.Ba7 Kc6 65.Kf3 Kd5 66.Be3 Nf8 67.
Bc1 Ng6 68.Bd2 Ke6 69.Bb4 Kd5 70.Kg3 Ke6 71.Ba5 Kd5 72.Bd8 Ke6 73.Bg5 Kd5 
74.Bd8 Ke6 75.Bf6 Kd5 76.Bg5 Ke6 77.Bh6 Kd5 78.h4 Ne7 79.h5 Nc6 80.Kh4 Nd8
81.Kg5 Ke6 82.Bg7 Nf7+ 83.Kh4 Nd8 84.Bf6 Nf7 85.Bg5 Kd5 86.Kg3 Ke6 87.Kf3 
Kd5 88.Ke3 Nh8 89.Kd3 Nf7 90.Kc3 Ke4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "2"]
[White "Spassky, Boris"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2655"]
[BlackElo "2565"]
[Result "1-0"]
[ECO "E91"]
[EventDate "1973.07.10"]
[PlyCount "79"]

1.d4 Nf6 2.c4 c5 3.d5 d6 4.Nc3 g6 5.e4 Bg7 6.Nf3 O-O 7.Be2 e6 8.O-O Re8 9.
Nd2 Na6 10.Rb1 Nc7 11.a4 b6 12.f4 exd5 13.cxd5 Ba6 14.Bxa6 Nxa6 15.Qf3 Qe7
16.b3 Nb4 17.Bb2 Rad8 18.h3 Nc2 19.Qd3 Nb4 20.Qf3 Nc2 21.Rbc1 Nd4 22.Qd3 
Nd7 23.Rce1 f5 24.exf5 Qxe1 25.Rxe1 Rxe1+ 26.Kf2 Rh1 27.fxg6 Rf8 28.gxh7+ 
Kh8 29.Ne2 Ne5 30.Qe4 Rd1 31.Bc3 Nd7 32.Bxd4 cxd4 33.Qc2 Rxd2 34.Qxd2 Nc5 
35.Kf3 d3 36.Nc3 a5 37.Ne4 Nxb3 38.Qxd3 Nd4+ 39.Kg4 Nf5 40.Ng5 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Andersson, Ulf"]
[Black "Radulov, Ivan"]
[WhiteElo "2555"]
[BlackElo "2530"]
[Result "1/2-1/2"]
[ECO "A37"]
[EventDate "1973.07.10"]
[PlyCount "80"]

1.Nf3 c5 2.c4 Nc6 3.Nc3 e5 4.g3 g6 5.Bg2 Bg7 6.d3 Nge7 7.Bd2 O-O 8.O-O h6 
9.a3 d6 10.Rb1 Be6 11.b4 Qd7 12.bxc5 dxc5 13.Ne4 b6 14.Bxh6 Bh3 15.Qd2 f6 
16.Ne1 g5 17.Bxg7 Kxg7 18.f4 gxf4 19.gxf4 Ng6 20.Bxh3 Qxh3 21.Rf3 Qg4+ 22.
Rg3 Qxf4 23.e3 Qh6 24.Qg2 Rh8 25.Nxf6 Ne7 26.Nd5 Nf5 27.Rg5 Raf8 28.Rb2 
Kh7 29.Qg4 Rhg8 30.Rg2 Nge7 31.Rxg8 Nxg8 32.Nf3 Nge7 33.Nxe7 Nxe7 34.Qe4+ 
Nf5 35.Rg5 Qh3 36.Rg3 Qh5 37.Rg5 Qh3 38.Rg3 Qh5 39.Ng5+ Kg6 40.Ne6+ Kf6 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Kavalek, Lubomir"]
[Black "Enklaar, Bertus"]
[WhiteElo "2565"]
[BlackElo "2445"]
[Result "1/2-1/2"]
[ECO "A04"]
[EventDate "1973.07.10"]
[PlyCount "130"]

1.e4 c5 2.Nf3 e6 3.d3 Nc6 4.g3 g6 5.Bg2 Bg7 6.O-O Nge7 7.Re1 d6 8.c3 e5 9.
a3 O-O 10.b4 a6 11.Nbd2 h6 12.Rb1 Rb8 13.Bb2 Kh7 14.Ba1 cxb4 15.axb4 Be6 
16.d4 exd4 17.cxd4 d5 18.b5 axb5 19.Rxb5 Qd7 20.Qb1 Rfe8 21.exd5 Bxd5 22.
Ne4 b6 23.Ne5 Nxe5 24.dxe5 Bxe4 25.Bxe4 Qe6 26.Rd1 Red8 27.Rxd8 Rxd8 28.
Rxb6 Rd1+ 29.Qxd1 Qxb6 30.h4 Qe6 31.Qd6 Qg4 32.Qd3 Qe6 33.f4 Qh3 34.Bd4 h5
35.Bf2 Qe6 36.Kg2 Nf5 37.Bd5 Qd7 38.Qc4 Nh6 39.Qc6 Qg4 40.Qb7 Qf5 41.Qb3 
Qd7 42.Qc4 Qf5 43.Qc6 Qd3 44.Be4 Qd2 45.Qd5 Qxd5 46.Bxd5 Bf8 47.Kf3 Bb4 
48.Bb6 Be7 49.Ba5 Kg8 50.e6 fxe6 51.Bxe6+ Kg7 52.Bc3+ Bf6 53.Be5 Nf7 54.
Bb8 Bc3 55.Ke4 Bb4 56.f5 Kf6 57.fxg6 Kxe6 58.gxf7 Kxf7 59.Kf5 Be7 60.Bf4 
Bd8 61.Be3 Bc7 62.Bf2 Bd8 63.Bd4 Bc7 64.Be5 Bd8 65.Bf4 Be7 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Langeweg, Christian"]
[Black "Marovic, Drazen"]
[WhiteElo "2430"]
[BlackElo "2480"]
[Result "1-0"]
[ECO "D46"]
[EventDate "1973.07.10"]
[PlyCount "45"]

1.Nf3 Nf6 2.c4 c6 3.Nc3 d5 4.e3 e6 5.d4 Nbd7 6.Bd3 Bd6 7.e4 dxe4 8.Nxe4 
Nxe4 9.Bxe4 e5 10.O-O exd4 11.Qxd4 Qf6 12.Bg5 Qxd4 13.Nxd4 Be5 14.Rad1 f6 
15.Bc1 Nc5 16.Nxc6 Be6 17.Nxe5 Nxe4 18.Rfe1 Nxf2 19.Rd6 fxe5 20.Rxe6+ Kf7 
21.R6xe5 Nd3 22.Rf1+ Kg6 23.Re6+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Petrosian, Tigran"]
[Black "Spassky, Boris"]
[WhiteElo "2640"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "D36"]
[EventDate "1973.07.10"]
[PlyCount "41"]

1.c4 e6 2.d4 d5 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 c6 6.Qc2 Na6 7.e3 Nb4 8.Qd2 
Bf5 9.Rc1 a5 10.a3 Na6 11.Nge2 Be7 12.Nf4 O-O 13.Bd3 Bxd3 14.Nxd3 Nd7 15.
Bxe7 Qxe7 16.O-O Nb6 17.Rfe1 Nc4 18.Qd1 f5 19.Nb1 Nc7 20.a4 Na6 21.Nd2 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Planinc, Albin"]
[Black "Ree, Hans"]
[WhiteElo "2525"]
[BlackElo "2440"]
[Result "1/2-1/2"]
[ECO "A04"]
[EventDate "1973.07.10"]
[PlyCount "85"]

1.g3 g6 2.Bg2 Bg7 3.Nf3 c5 4.d4 cxd4 5.Nxd4 Nc6 6.Nb3 Nf6 7.Nc3 O-O 8.O-O 
d6 9.Re1 Bd7 10.h3 Rc8 11.a4 b6 12.e4 Nb4 13.Re2 Qc7 14.Be3 Qb8 15.Bd4 e5 
16.Be3 Be6 17.Rd2 Rfd8 18.Nd5 Nbxd5 19.exd5 Bd7 20.Qe2 Qc7 21.a5 Be8 22.c3
Nd7 23.Rc2 Nc5 24.axb6 axb6 25.Nd2 Ra8 26.Rxa8 Rxa8 27.b4 Ra1+ 28.Kh2 Na6 
29.Qc4 e4 30.Bxe4 Qxc4 31.Nxc4 Ba4 32.Rc1 Rxc1 33.Bxc1 Bxc3 34.Nxb6 Bb5 
35.Nc8 Bxb4 36.Bf4 Bd7 37.Nb6 Bb5 38.g4 Nc7 39.Nc8 Bc4 40.Nxd6 Bxd5 41.Ne8
Nxe8 42.Bxd5 Bd6 43.Kg3 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Ribli, Zoltan"]
[Black "Smejkal, Jan"]
[WhiteElo "2525"]
[BlackElo "2595"]
[Result "1-0"]
[ECO "E65"]
[EventDate "1973.07.10"]
[PlyCount "79"]

1.Nf3 Nf6 2.c4 c5 3.Nc3 Nc6 4.g3 g6 5.Bg2 Bg7 6.d4 O-O 7.O-O d6 8.dxc5 
dxc5 9.Be3 Be6 10.Nd2 Nd4 11.Nb3 Ng4 12.Bf4 Bxc4 13.Nxc5 e5 14.Bd2 b6 15.
b3 bxc5 16.bxc4 Rb8 17.e3 Ne6 18.h3 Nf6 19.Qc2 e4 20.Rad1 Ng5 21.Bc1 Qc8 
22.Nd5 Nxd5 23.Rxd5 Nxh3+ 24.Kh2 Ng5 25.Rxg5 f5 26.Bxe4 fxe4 27.Qxe4 Rf5 
28.Rxf5 Qxf5 29.Qxf5 gxf5 30.Ba3 Rb6 31.Rd1 Ra6 32.Bxc5 Rxa2 33.Kg2 a5 34.
Rd8+ Kf7 35.Rd7+ Kg6 36.Bd4 Bf8 37.c5 Rc2 38.Ra7 a4 39.Rxa4 Bxc5 40.Ra6+ 
1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Szabo, Laszlo"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2565"]
[BlackElo "2520"]
[Result "0-1"]
[ECO "B97"]
[EventDate "1973.07.10"]
[PlyCount "62"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Nb3 Be7
9.Qf3 Nbd7 10.O-O-O Qc7 11.Be2 b5 12.Bxf6 Nxf6 13.e5 Bb7 14.Qg3 dxe5 15.
fxe5 Nd7 16.Rxd7 Kxd7 17.Qxg7 Raf8 18.Bh5 b4 19.Bxf7 bxc3 20.Bxe6+ Kc6 21.
Qg3 cxb2+ 22.Kb1 Bc8 23.Nd4+ Kb6 24.Qb3+ Ka7 25.Qa4 Qc5 26.Bd7 Bb7 27.e6 
Rf2 28.Rd1 Rhf8 29.Bb5 R8f4 30.c3 Rxd4 31.cxd4 Be4+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "3"]
[White "Timman, Jan"]
[Black "Donner, Jan"]
[WhiteElo "2470"]
[BlackElo "2480"]
[Result "0-1"]
[ECO "B07"]
[EventDate "1973.07.10"]
[PlyCount "78"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nge2 Bg7 5.g3 O-O 6.Bg2 e5 7.O-O c6 8.a4 a5 9.
b3 Na6 10.Ba3 Re8 11.Qd2 Nb4 12.Rae1 Qb6 13.Bb2 Be6 14.Nd1 Rad8 15.Ne3 Ng4
16.h3 Nxe3 17.fxe3 d5 18.exd5 Bxd5 19.Bxd5 Nxd5 20.Nc3 exd4 21.Nxd5 Rxd5 
22.exd4 Rxe1 23.Rxe1 Bxd4+ 24.Bxd4 Qxd4+ 25.Qxd4 Rxd4 26.Re7 Rb4 27.Kf2 
Kg7 28.Re5 b6 29.Re3 Rd4 30.Kf3 Kf6 31.Ke2 Rd5 32.Rc3 Rc5 33.Rf3+ Ke6 34.
c3 f5 35.h4 Re5+ 36.Kd2 Re4 37.Kd3 Rg4 38.Re3+ Kd6 39.Ke2 Re4 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Andersson, Ulf"]
[Black "Langeweg, Christian"]
[WhiteElo "2555"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "A14"]
[EventDate "1973.07.10"]
[PlyCount "63"]

1.Nf3 Nf6 2.c4 e6 3.b3 c5 4.g3 Nc6 5.Bg2 Be7 6.O-O O-O 7.Bb2 d5 8.e3 d4 9.
exd4 cxd4 10.Re1 d3 11.a3 a5 12.Nc3 Nd7 13.Nb5 Nc5 14.Ne5 Nxe5 15.Bxe5 Bd7
16.b4 Bxb5 17.cxb5 Nd7 18.Bc3 axb4 19.axb4 Qb6 20.Qf3 Rab8 21.Qxd3 Nf6 22.
Ra5 Rfd8 23.Qe3 Qxe3 24.fxe3 Nd5 25.Bxd5 Rxd5 26.Rea1 Rdd8 27.Kf2 f6 28.
Ke2 e5 29.Rf1 Bd6 30.Raa1 Kf7 31.Rfc1 Ke6 32.e4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Donner, Jan"]
[Black "Ribli, Zoltan"]
[WhiteElo "2480"]
[BlackElo "2525"]
[Result "1-0"]
[ECO "E66"]
[EventDate "1973.07.10"]
[PlyCount "79"]

1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.Nc3 d6 6.Nf3 Nc6 7.d5 Na5 8.b3 c5 9.
Bb2 a6 10.O-O Rb8 11.Nd2 b5 12.Qc2 e5 13.Rae1 Nh5 14.e4 f5 15.exf5 gxf5 
16.Ne2 f4 17.gxf4 Nxf4 18.Nxf4 Rxf4 19.cxb5 axb5 20.Ne4 Rb7 21.Bc1 Rg4 22.
f4 exf4 23.Bxf4 Bd4+ 24.Kh1 Rbg7 25.Bg3 Nb7 26.Bf3 R4g6 27.Bh5 Rh6 28.Nf6+
Bxf6 29.Re8+ Qxe8 30.Bxe8 Bh3 31.Rg1 b4 32.Qe4 Bd4 33.Bb5 Rf6 34.Re1 Bf5 
35.Qh4 Rg4 36.Re8+ Kg7 37.Re7+ Kg8 38.Re8+ Kg7 39.Qh5 Re4 40.Qg5+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Enklaar, Bertus"]
[Black "Petrosian, Tigran"]
[WhiteElo "2445"]
[BlackElo "2640"]
[Result "0-1"]
[ECO "B81"]
[EventDate "1973.07.10"]
[PlyCount "102"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.g4 h6 7.h3 a6 8.Bg2 Bd7 
9.O-O Nc6 10.Be3 Qc7 11.Qe2 Be7 12.Rad1 b5 13.a3 Nxd4 14.Bxd4 e5 15.Be3 
Be6 16.Nd5 Bxd5 17.exd5 Nd7 18.c3 O-O 19.Be4 Bg5 20.Bb1 Rae8 21.a4 bxa4 
22.Qc2 g6 23.Qxa4 a5 24.Qe4 Kg7 25.Kg2 Rb8 26.Rd2 Nc5 27.Qc4 Bxe3 28.fxe3 
a4 29.Qe2 Qe7 30.Qf3 Rb3 31.Ba2 Rb7 32.Bc4 Rfb8 33.Rff2 Rh8 34.Kh2 h5 35.
Rg2 hxg4 36.Rxg4 Rh4 37.Rf2 Rxg4 38.Qxg4 Rb8 39.h4 Rh8 40.Kg3 Rh5 41.e4 
Nd7 42.Be2 Nf6 43.Qf3 Rh8 44.Rh2 Qa7 45.Rh1 Nh5+ 46.Kg2 Qb6 47.Rb1 a3 48.
b4 Nf4+ 49.Kg3 a2 50.Rh1 Qa7 51.Ra1 Qe7 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Marovic, Drazen"]
[Black "Planinc, Albin"]
[WhiteElo "2480"]
[BlackElo "2525"]
[Result "0-1"]
[ECO "A62"]
[EventDate "1973.07.10"]
[PlyCount "56"]

1.c4 Nf6 2.d4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2 O-O 
9.O-O Na6 10.h3 Bd7 11.e4 Qc8 12.Kh2 Re8 13.Re1 c4 14.e5 dxe5 15.Nxe5 Bf5 
16.Bg5 Nb4 17.Rc1 Nd7 18.Nxd7 Qxd7 19.Rxe8+ Rxe8 20.Qd2 Nd3 21.Rd1 b5 22.
g4 b4 23.Ne2 Be4 24.Bxe4 Rxe4 25.f3 Re8 26.b3 Qxd5 27.bxc4 Qxf3 28.Ng1 
Be5+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Radulov, Ivan"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2530"]
[BlackElo "2520"]
[Result "1-0"]
[ECO "C05"]
[EventDate "1973.07.10"]
[PlyCount "67"]

1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3 c5 6.c3 Nc6 7.Ne2 Be7 8.O-O O-O 
9.f4 f5 10.Kh1 Qe8 11.Rg1 Qh5 12.Nf3 cxd4 13.cxd4 Nb4 14.Bb1 Nb6 15.Ng3 
Qe8 16.Nf1 Kh8 17.g4 g6 18.a3 Nc6 19.b3 a5 20.Ra2 a4 21.b4 Na7 22.Rag2 Nb5
23.Qd3 Bd7 24.gxf5 exf5 25.e6 Bxe6 26.Ne5 Rg8 27.Qh3 Bf7 28.Ne3 Nd6 29.
Nxf5 gxf5 30.Bxf5 Nxf5 31.Qxf5 Rf8 32.Rg7 Bg6 33.Nxg6+ hxg6 34.R7xg6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Ree, Hans"]
[Black "Timman, Jan"]
[WhiteElo "2440"]
[BlackElo "2470"]
[Result "0-1"]
[ECO "A17"]
[EventDate "1973.07.10"]
[PlyCount "118"]

1.Nf3 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 O-O 5.a3 Bxc3 6.Qxc3 d6 7.g3 e5 8.Bg2 
Nc6 9.b4 Bg4 10.h3 Bh5 11.b5 Nb8 12.O-O Nbd7 13.Bb2 Re8 14.a4 a5 15.d4 e4 
16.Nd2 Bxe2 17.Rfe1 Bd3 18.f3 d5 19.cxd5 Nxd5 20.Qb3 Nb4 21.fxe4 Bc2 22.
Qc3 Nb6 23.Nb3 Bxb3 24.Qxb3 c6 25.Rf1 Qd7 26.Rf4 Qe6 27.Qc3 f6 28.bxc6 
bxc6 29.Bf1 g5 30.d5 N6xd5 31.exd5 Nxd5 32.Rxf6 Nxc3 33.Rxe6 Rxe6 34.Bxc3 
Re3 35.Bc4+ Kf8 36.Rf1+ Ke8 37.Bg7 Kd7 38.Kf2 Rae8 39.Rb1 h5 40.Rb7+ Kc8 
41.Ba6 R3e4 42.Rf7+ Kb8 43.Bf6 Rxa4 44.Bxg5 Rb4 45.Bf4+ Ka8 46.Bd6 Rb2+ 
47.Kf3 a4 48.Rf5 Rd8 49.Be5 a3 50.Rxh5 Rb3+ 51.Kf4 Rb4+ 52.Ke3 Ra4 53.Bd3 
a2 54.Be4 Kb7 55.Rh8 Rd1 56.Rh7+ Kb6 57.Bd3 Re1+ 58.Be2 Rxe2+ 59.Kxe2 Re4+
0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Smejkal, Jan"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2595"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "A43"]
[EventDate "1973.07.10"]
[PlyCount "73"]

1.d4 c5 2.d5 d6 3.c4 g6 4.g3 Bg7 5.Bg2 Na6 6.Nf3 f5 7.O-O Nf6 8.Nc3 O-O 9.
Rb1 Bd7 10.b3 Rb8 11.Bb2 Nc7 12.e3 b5 13.cxb5 Nxb5 14.Ng5 Qa5 15.Nxb5 Rxb5
16.a4 Rb6 17.Ne6 Bxe6 18.dxe6 Ne4 19.Bxg7 Kxg7 20.Bxe4 fxe4 21.Qd5 Rb4 22.
f3 Rf5 23.Qd2 exf3 24.Qc3+ Rf6 25.Rxf3 Rxa4 26.Qxf6+ exf6 27.bxa4 Qc7 28.
a5 Qe7 29.a6 Qxe6 30.Rb7+ Kh6 31.Rxa7 Qe4 32.Rxf6 Qxe3+ 33.Kg2 Qe2+ 34.Rf2
Qe4+ 35.Kg1 Qe1+ 36.Kg2 Qe4+ 37.Kg1 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "4"]
[White "Spassky, Boris"]
[Black "Szabo, Laszlo"]
[WhiteElo "2655"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "E45"]
[EventDate "1973.07.10"]
[PlyCount "56"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2 Ba6 6.Ng3 Bxc3+ 7.bxc3 d5 8.Ba3 
Bxc4 9.Bxc4 dxc4 10.Qa4+ Qd7 11.Qxc4 Qc6 12.Qxc6+ Nxc6 13.c4 Na5 14.Rc1 
Rc8 15.e4 c5 16.d5 O-O 17.O-O exd5 18.cxd5 Rfe8 19.Rfe1 Nd7 20.f4 b5 21.
Nf5 Nb7 22.e5 g6 23.Ne3 c4 24.Ng4 Kg7 25.Bb2 Kf8 26.Ba3+ Kg7 27.Bb2 Kf8 
28.Ba3+ Kg7 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Kavalek, Lubomir"]
[Black "Donner, Jan"]
[WhiteElo "2565"]
[BlackElo "2480"]
[Result "1-0"]
[ECO "B07"]
[EventDate "1973.07.10"]
[PlyCount "75"]

1.e4 d6 2.d4 Nf6 3.Nd2 e5 4.c3 Nc6 5.Ngf3 g6 6.Bb5 Bd7 7.dxe5 dxe5 8.Bxc6 
Bxc6 9.Nxe5 Qd6 10.Nxc6 Qxc6 11.O-O O-O-O 12.e5 Nd7 13.Qg4 h5 14.Qh3 g5 
15.Qf5 Qg6 16.Qxg6 fxg6 17.Ne4 g4 18.e6 Nc5 19.Nxc5 Bxc5 20.Bf4 Rde8 21.
Rae1 Rhf8 22.Re4 Rf6 23.Rfe1 g5 24.Bxg5 Bxf2+ 25.Kh1 Rf5 26.Rf1 Rxg5 27.
Rxf2 Rg6 28.Rfe2 Kd8 29.e7+ Kd7 30.Kg1 Rg7 31.Kf2 h4 32.R2e3 c6 33.g3 h3 
34.Rd4+ Kc7 35.Rf4 Kd6 36.Ree4 Rgxe7 37.Rxe7 Rxe7 38.Rxg4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Langeweg, Christian"]
[Black "Radulov, Ivan"]
[WhiteElo "2430"]
[BlackElo "2530"]
[Result "0-1"]
[ECO "D27"]
[EventDate "1973.07.10"]
[PlyCount "82"]

1.Nf3 d5 2.c4 dxc4 3.e3 Nf6 4.Bxc4 e6 5.d4 c5 6.O-O a6 7.Bb3 Qc7 8.Qe2 Nc6
9.Nc3 Bd6 10.Bd2 O-O 11.Rac1 b6 12.dxc5 Bxc5 13.Bc2 Bb7 14.Ne4 Be7 15.
Nxf6+ Bxf6 16.Bc3 Bxc3 17.Qd3 g6 18.Qxc3 Rac8 19.Be4 Qe7 20.a3 Na5 21.Qd3 
b5 22.Bxb7 Qxb7 23.Rxc8 Rxc8 24.h3 Qc7 25.Rd1 Qc4 26.Qd7 Qc7 27.Qd4 Nc6 
28.Qf6 Ne7 29.e4 Nc6 30.h4 Qe7 31.Qxe7 Nxe7 32.Rd7 Nc6 33.Ng5 Ne5 34.Ra7 
h6 35.Nf3 Ng4 36.g3 Rc1+ 37.Kg2 Rc2 38.Nd4 Rxf2+ 39.Kg1 Rxb2 40.Rxa6 b4 
41.axb4 Rxb4 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Petrosian, Tigran"]
[Black "Smejkal, Jan"]
[WhiteElo "2640"]
[BlackElo "2595"]
[Result "1-0"]
[ECO "A31"]
[EventDate "1973.07.10"]
[PlyCount "133"]

1.c4 Nf6 2.Nc3 c5 3.Nf3 Nc6 4.d4 cxd4 5.Nxd4 g6 6.Nc2 d6 7.g3 Bg7 8.Bg2 
O-O 9.O-O Be6 10.b3 Qd7 11.Nd5 Bf5 12.Bb2 Nxd5 13.Bxg7 Kxg7 14.Bxd5 Bh3 
15.Re1 h5 16.Ne3 h4 17.Rc1 hxg3 18.hxg3 Rh8 19.c5 Be6 20.Bg2 Rh5 21.cxd6 
exd6 22.Qd2 Rah8 23.Red1 d5 24.Nxd5 Bxd5 25.Bxd5 Qh3 26.Bxc6 bxc6 27.Qc3+ 
Kh7 28.Qxc6 Qh2+ 29.Kf1 Rc8 30.Qg2 Rxc1 31.Rxc1 Qh1+ 32.Qg1 Qd5 33.f3 Qd2 
34.Re1 Qxa2 35.Qe3 Rh1+ 36.Kf2 Rxe1 37.Kxe1 a5 38.Kf2 a4 39.bxa4 Qxa4 40.
Qe5 Qc4 41.g4 Kg8 42.f4 Qb4 43.Qe8+ Kg7 44.Qe3 Kf8 45.Kg3 Qe1+ 46.Kg2 Qb4 
47.Kh3 Qe1 48.Kg2 Qb4 49.Qe5 g5 50.Qxg5 Qe4+ 51.Kf2 Qd4+ 52.Kf3 Qc3+ 53.e3
Qc6+ 54.Kg3 Qh1 55.Qd8+ Kg7 56.Qd4+ Kh7 57.Qd3+ Kg7 58.Qd4+ f6 59.g5 Qg1+ 
60.Kf3 Qf1+ 61.Ke4 Qb1+ 62.Kd5 Qb5+ 63.Kd6 Qa6+ 64.Kc5 Qa3+ 65.Kc4 Kg8 66.
Qd8+ Kh7 67.Qd3+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Planinc, Albin"]
[Black "Andersson, Ulf"]
[WhiteElo "2525"]
[BlackElo "2555"]
[Result "1-0"]
[ECO "C15"]
[EventDate "1973.07.10"]
[PlyCount "85"]

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Qg4 Nf6 5.Qxg7 Rg8 6.Qh6 dxe4 7.Ne2 b6 8.Bg5 
Nbd7 9.Ng3 Bb7 10.Bb5 Rg6 11.Qh4 h6 12.Bxh6 a6 13.Be2 Qe7 14.Bd2 O-O-O 15.
O-O-O Nf8 16.f3 exf3 17.Bxf3 Bxf3 18.gxf3 Qd7 19.Nge2 Be7 20.Qf2 Rg8 21.h4
Nh5 22.f4 Qc6 23.f5 Qg2 24.Qe3 Nf6 25.fxe6 Nxe6 26.Rhg1 Qc6 27.Rxg8 Rxg8 
28.Qd3 Nd5 29.Qf3 Rd8 30.h5 Kb7 31.Qxf7 Rf8 32.Qg6 Nxc3 33.Bxc3 Bg5+ 34.
Kb1 Rf2 35.Ng3 Qf3 36.Qe4+ Ka7 37.Qxf3 Rxf3 38.Ne4 Bh6 39.a4 Rh3 40.d5 Nf4
41.d6 cxd6 42.Rxd6 Rxh5 43.Bd4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Quinteros, Miguel Angel"]
[Black "Spassky, Boris"]
[WhiteElo "2520"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "D37"]
[EventDate "1973.07.10"]
[PlyCount "45"]

1.Nf3 d5 2.c4 e6 3.d4 Nf6 4.Nc3 Be7 5.Bf4 O-O 6.e3 c5 7.dxc5 Bxc5 8.Be2 
Nc6 9.cxd5 exd5 10.O-O Be6 11.Rc1 Rc8 12.a3 Bb6 13.Qa4 Qe7 14.Bg5 h6 15.
Bh4 g5 16.Bg3 Rfd8 17.Rfd1 Nh5 18.Nb5 Qf6 19.Nfd4 Nxg3 20.hxg3 a6 21.Nc3 
Bxd4 22.exd4 Ra8 23.Rd2 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Ribli, Zoltan"]
[Black "Ree, Hans"]
[WhiteElo "2525"]
[BlackElo "2440"]
[Result "1-0"]
[ECO "B79"]
[EventDate "1973.07.10"]
[PlyCount "141"]

1.Nf3 c5 2.e4 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4 O-O 8.Bb3 
d6 9.f3 Bd7 10.h4 Qa5 11.Qd2 Rfc8 12.O-O-O Ne5 13.g4 b5 14.h5 Nc4 15.Qd3 
Ne5 16.Qd2 Nc4 17.Bxc4 bxc4 18.Bh6 Bh8 19.Nf5 Bxf5 20.exf5 Rab8 21.hxg6 
fxg6 22.Qe3 Qe5 23.Qxe5 dxe5 24.g5 Ne8 25.Nd5 Rb7 26.fxg6 hxg6 27.Bf8 Kxf8
28.Rxh8+ Kf7 29.Ne3 c3 30.b3 Nd6 31.Rh7+ Ke6 32.Ng4 e4 33.fxe4 Rb4 34.Ne5 
Nxe4 35.Nxg6 Nxg5 36.Rxe7+ Kf5 37.Re5+ Kxg6 38.Rg1 Kf6 39.Rexg5 Re4 40.
Rg6+ Kf5 41.a3 Rce8 42.R1g5+ Kf4 43.Rg4+ Kf5 44.R6g5+ Kf6 45.Rxe4 Rxe4 46.
Rd5 Ke6 47.Rd3 Re1+ 48.Rd1 Rxd1+ 49.Kxd1 Kd5 50.Kc1 Ke4 51.Kb1 Ke3 52.b4 
Kd4 53.Ka2 Kc4 54.b5 Kxb5 55.Kb3 Kb6 56.Kxc3 Kc5 57.a4 Kd5 58.Kb4 Kc6 59.
Ka5 Kb7 60.Kb5 Kc7 61.Kc5 Kd7 62.c4 Kc7 63.Kd5 Kd7 64.a5 Kc7 65.Ke6 Kc6 
66.a6 Kc7 67.Ke7 Kc6 68.Kd8 Kd6 69.Kc8 Kc6 70.Kb8 Kb6 71.c5+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Szabo, Laszlo"]
[Black "Enklaar, Bertus"]
[WhiteElo "2565"]
[BlackElo "2445"]
[Result "1/2-1/2"]
[ECO "A33"]
[EventDate "1973.07.10"]
[PlyCount "117"]

1.c4 c5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 cxd4 5.Nxd4 e6 6.g3 Ne5 7.Bf4 Ng6 8.Bd2 
Qb6 9.e3 Be7 10.Bg2 Ne5 11.Qe2 O-O 12.O-O d6 13.Na4 Qa6 14.b3 Bd7 15.Nc3 
Rfd8 16.Rfd1 Rac8 17.h3 d5 18.cxd5 Qxe2 19.Ndxe2 exd5 20.Be1 Bc6 21.Nd4 
Bb4 22.Nxc6 bxc6 23.Rac1 h6 24.Kf1 Re8 25.Rc2 Rcd8 26.Ne2 Bxe1 27.Kxe1 Rd6
28.Nd4 Ne4 29.f4 Nd7 30.Rxc6 Rxc6 31.Nxc6 Nc3 32.Rd3 Nxa2 33.Rxd5 Nb6 34.
Rd3 a5 35.Nxa5 Nb4 36.Rd4 Nc2+ 37.Kd2 Nxd4 38.exd4 Kf8 39.Nc4 Rb8 40.Kc3 
Ke7 41.d5 f6 42.Be4 Nc8 43.Na5 Kd6 44.Nc6 Rb7 45.b4 Kc7 46.Kd4 Nd6 47.Bd3 
Kb6 48.h4 Rc7 49.h5 Rc8 50.Ke3 Re8+ 51.Kf3 Ra8 52.Nd4 Ra4 53.Ne6 Rxb4 54.
Kg4 Rb3 55.Bg6 Rb5 56.Nxg7 Rxd5 57.Kf3 Kc7 58.g4 Kd7 59.Nf5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "5"]
[White "Timman, Jan"]
[Black "Marovic, Drazen"]
[WhiteElo "2470"]
[BlackElo "2480"]
[Result "1-0"]
[ECO "E83"]
[EventDate "1973.07.10"]
[PlyCount "73"]

1.c4 Nf6 2.Nc3 g6 3.e4 d6 4.d4 Bg7 5.f3 O-O 6.Be3 Nc6 7.Nge2 Rb8 8.Qd2 Re8
9.Rb1 a5 10.g3 Nd7 11.Bg2 e5 12.d5 Ne7 13.O-O b6 14.a3 Ba6 15.b3 f5 16.Nb5
Nf6 17.Kh1 Rf8 18.Nec3 Nh5 19.Bf2 Kh8 20.b4 axb4 21.axb4 Ng8 22.Ra1 Bh6 
23.Qe2 Bxb5 24.Nxb5 Nhf6 25.c5 bxc5 26.bxc5 Ne8 27.c6 f4 28.Ra7 fxg3 29.
hxg3 Ngf6 30.Bh3 Nh5 31.Bg4 Rf7 32.Kg2 Qg5 33.Rb7 Ra8 34.Rh1 Rd8 35.Bb6 
Nef6 36.Rxc7 Nxg4 37.Rxf7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Andersson, Ulf"]
[Black "Timman, Jan"]
[WhiteElo "2555"]
[BlackElo "2470"]
[Result "1/2-1/2"]
[ECO "D79"]
[EventDate "1973.07.10"]
[PlyCount "25"]

1.Nf3 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 c6 5.O-O O-O 6.Nc3 d5 7.cxd5 cxd5 8.d4 
Ne4 9.Ne5 Nxc3 10.bxc3 Nd7 11.Nxd7 Qxd7 12.Qd3 Rd8 13.e4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Donner, Jan"]
[Black "Petrosian, Tigran"]
[WhiteElo "2480"]
[BlackElo "2640"]
[Result "1/2-1/2"]
[ECO "E41"]
[EventDate "1973.07.10"]
[PlyCount "42"]

1.d4 e6 2.c4 Bb4+ 3.Nc3 Nf6 4.e3 c5 5.Bd3 b6 6.Ne2 cxd4 7.exd4 O-O 8.d5 
Re8 9.O-O Na6 10.a3 Be7 11.Nd4 Bb7 12.Bf4 Bf8 13.Ndb5 exd5 14.cxd5 d6 15.
Rc1 Nc5 16.Bc4 a6 17.Nd4 b5 18.Ba2 Qd7 19.Qf3 Qg4 20.Qxg4 Nxg4 21.Rfd1 Ne5
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Enklaar, Bertus"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2445"]
[BlackElo "2520"]
[Result "1-0"]
[ECO "B06"]
[EventDate "1973.07.10"]
[PlyCount "77"]

1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Bg5 c6 5.Qd2 h6 6.Be3 Nf6 7.h3 Nbd7 8.Nf3 Qc7 
9.a4 a5 10.Be2 Nb6 11.O-O Be6 12.b3 d5 13.Bf4 Qc8 14.e5 Nfd7 15.Rfe1 Nf8 
16.Nh2 h5 17.Be3 f6 18.exf6 exf6 19.Bd3 Kf7 20.Bf4 Qd7 21.Nf1 Nc8 22.Re2 
Nd6 23.Rae1 f5 24.Be5 Ne4 25.Bxe4 dxe4 26.Qf4 Bh6 27.Qh4 Rh7 28.f3 exf3 
29.gxf3 Qd8 30.Qg3 h4 31.Qh2 Qb6 32.f4 Nd7 33.Qf2 Nxe5 34.Rxe5 Re8 35.Rxe6
Rxe6 36.Rxe6 Qb4 37.Re3 Kf8 38.Ne2 Bg7 39.Re6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Langeweg, Christian"]
[Black "Planinc, Albin"]
[WhiteElo "2430"]
[BlackElo "2525"]
[Result "0-1"]
[ECO "E98"]
[EventDate "1973.07.10"]
[PlyCount "66"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.d4 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 
9.Ne1 Ne8 10.f3 f5 11.g4 c6 12.Nd3 Bd7 13.Nf2 Rc8 14.Bd2 Kh8 15.Kg2 Ng8 
16.g5 Rf7 17.h4 f4 18.Rh1 Bf8 19.Qb3 Ng7 20.c5 dxc5 21.dxc6 Be6 22.Bc4 
Rxc6 23.Nd5 Ne7 24.Qxb7 Rd6 25.Qb3 Bxd5 26.Bxd5 Nxd5 27.exd5 Rxd5 28.Ba5 
Qa8 29.Ng4 Nf5 30.Rad1 Rfd7 31.Nf6 c4 32.Rxd5 Rxd5 33.Qc3 Rd3 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Marovic, Drazen"]
[Black "Ribli, Zoltan"]
[WhiteElo "2480"]
[BlackElo "2525"]
[Result "1/2-1/2"]
[ECO "D94"]
[EventDate "1973.07.10"]
[PlyCount "96"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.Bd2 c5 7.dxc5 Na6 8.cxd5 
Nxc5 9.Bc4 a6 10.a4 Bf5 11.Qe2 Rc8 12.O-O Nfe4 13.Nd4 Nxd2 14.Qxd2 Ne4 15.
Nxe4 Bxe4 16.Qb4 Bxd5 17.Bxd5 Qxd5 18.Qxe7 Bxd4 19.exd4 Rfe8 20.Qa3 Qxd4 
21.Qb3 Re2 22.Qxb7 Rcc2 23.Rad1 Qf6 24.Qd5 Rxb2 25.Qd8+ Qxd8 26.Rxd8+ Kg7 
27.Rd6 Re6 28.Rd4 Reb6 29.Rd5 Rc6 30.g3 Ra2 31.Rd4 Rc5 32.h4 Ra5 33.Rb1 
R5xa4 34.Rxa4 Rxa4 35.Rb6 h6 36.Kg2 Ra1 37.Kf3 a5 38.Ra6 a4 39.Kf4 a3 40.
g4 a2 41.Kf3 Kf8 42.Ra7 Ke8 43.Kg2 Kd8 44.Ra8+ Kc7 45.Ra7+ Kb6 46.Ra8 Kc5 
47.Rc8+ Kd4 48.Ra8 Ke4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Radulov, Ivan"]
[Black "Spassky, Boris"]
[WhiteElo "2530"]
[BlackElo "2655"]
[Result "0-1"]
[ECO "B09"]
[EventDate "1973.07.10"]
[PlyCount "150"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 c5 6.dxc5 Qa5 7.Qd3 Qxc5 8.Be3 
Qa5 9.Qb5+ Qxb5 10.Bxb5+ Nc6 11.O-O-O a6 12.Bd3 Ng4 13.Bb6 O-O 14.h3 Nf6 
15.g4 Nd7 16.Be3 Rb8 17.Ne2 b5 18.Kb1 Bb7 19.Ned4 Nc5 20.Nb3 Na4 21.Bc1 
Rfc8 22.c3 Rc7 23.Nfd4 Rbc8 24.Nxc6 Bxc6 25.a3 f5 26.gxf5 gxf5 27.Rhe1 
fxe4 28.Bc2 d5 29.Nd4 Bxd4 30.Rxd4 Nb6 31.Rg1+ Kf7 32.Bd1 Rg8 33.Bh5+ Kf8 
34.Rdd1 Rxg1 35.Rxg1 Be8 36.Bg4 Bf7 37.f5 Nc4 38.h4 Rc6 39.Bf4 e3 40.b3 
Nd2+ 41.Kb2 d4 42.cxd4 Bxb3 43.Rc1 Rxc1 44.Kxc1 Bd5 45.Bxe3 Nc4 46.Bh6+ 
Ke8 47.a4 bxa4 48.Be2 Nd6 49.Bg5 Nxf5 50.Bxa6 Nxd4 51.Bd3 h5 52.Be3 Nf3 
53.Bb5+ Kf7 54.Bxa4 Nxh4 55.Bd1 Kg6 56.Bc2+ Kf6 57.Kd2 Ng2 58.Bg1 Bf3 59.
Bd3 e5 60.Bf1 Nh4 61.Bb6 Kf5 62.Bd8 Kg4 63.Bb5 Ng2 64.Bd7+ Kg3 65.Bc7 Kf4 
66.Bb5 Nh4 67.Ke1 Bg4 68.Bf1 Nf5 69.Kf2 h4 70.Bd3 Ng3 71.Bd8 h3 72.Bh4 Nh5
73.Bg6 e4 74.Bd8 e3+ 75.Ke1 Kg3 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Ree, Hans"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2440"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "E62"]
[EventDate "1973.07.10"]
[PlyCount "73"]

1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.O-O O-O 5.d4 c6 6.c4 d6 7.Nc3 Qa5 8.h3 e5 9.
e4 exd4 10.Nxd4 Qc5 11.Nb3 Qxc4 12.Qxd6 a5 13.Bg5 Nbd7 14.Rfd1 Qb4 15.e5 
Ne8 16.Qxb4 axb4 17.Ne4 Bxe5 18.Be7 f5 19.Bxf8 Kxf8 20.Nec5 Nxc5 21.Nxc5 
Bd6 22.Rdc1 Ra5 23.Nb3 Ra7 24.Nd2 Be6 25.Nc4 Be7 26.a3 Bf6 27.Rab1 b5 28.
Ne3 Ba2 29.axb4 Bxb1 30.Rxb1 Ra6 31.Rc1 Bxb2 32.Rxc6 Rxc6 33.Bxc6 Nc7 34.
Nd5 Nxd5 35.Bxd5 Bc3 36.Bc6 Bxb4 37.Bxb5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "6"]
[White "Smejkal, Jan"]
[Black "Szabo, Laszlo"]
[WhiteElo "2595"]
[BlackElo "2565"]
[Result "0-1"]
[ECO "D77"]
[EventDate "1973.07.10"]
[PlyCount "76"]

1.Nf3 d5 2.g3 g6 3.Bg2 Bg7 4.d4 Nf6 5.O-O O-O 6.c4 dxc4 7.Na3 Na6 8.Nxc4 
Be6 9.Nce5 Bd5 10.Be3 c6 11.Qc1 Qb6 12.b3 Rac8 13.Bh3 e6 14.Bh6 Bxf3 15.
Bxg7 Kxg7 16.Nxf3 c5 17.Rd1 Rfd8 18.Bg2 cxd4 19.Qb2 d3 20.exd3 Nb4 21.Ne1 
Rc7 22.a3 Nc6 23.Rac1 Nd4 24.Rxc7 Qxc7 25.Nf3 Nxf3+ 26.Bxf3 Rc8 27.b4 b6 
28.b5 Qc3 29.Qb4 Rc5 30.Bc6 a5 31.Qf4 Qxa3 32.Qb8 Rc1 33.Rxc1 Qxc1+ 34.Kg2
Qc5 35.Qd8 Ng4 36.d4 Qc2 37.Kf3 Qxf2+ 38.Kxg4 Qf5+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Kavalek, Lubomir"]
[Black "Marovic, Drazen"]
[WhiteElo "2565"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "B04"]
[EventDate "1973.07.10"]
[PlyCount "65"]

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 g6 5.Bc4 Nb6 6.Bb3 Bg7 7.Ng5 d5 8.f4 f6 9.
Nf3 a5 10.a4 O-O 11.O-O Nc6 12.c3 Bf5 13.Nh4 Bxb1 14.Rxb1 f5 15.Rf3 Qd7 
16.Rh3 Nd8 17.Bc2 Ne6 18.b3 Rf7 19.Be3 Rc8 20.Ra1 Ra8 21.Kh1 Rff8 22.Qe2 
Rf7 23.Rf1 Raf8 24.Qf3 Qc6 25.Bg1 g5 26.Nxf5 Nxf4 27.Nd6 exd6 28.Bxh7+ Kh8
29.Bg6+ Kg8 30.Bh7+ Kh8 31.Bg6+ Kg8 32.Bh7+ Kh8 33.Bg6+ 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Petrosian, Tigran"]
[Black "Ree, Hans"]
[WhiteElo "2640"]
[BlackElo "2440"]
[Result "1/2-1/2"]
[ECO "E60"]
[EventDate "1973.07.10"]
[PlyCount "19"]

1.d4 Nf6 2.c4 g6 3.d5 Bg7 4.g3 c6 5.Bg2 Qa5+ 6.Nc3 Qb4 7.Qd3 d6 8.Kf1 cxd5
9.cxd5 Na6 10.a3 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Planinc, Albin"]
[Black "Radulov, Ivan"]
[WhiteElo "2525"]
[BlackElo "2530"]
[Result "1/2-1/2"]
[ECO "D27"]
[EventDate "1973.07.10"]
[PlyCount "73"]

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.a4 Nc6 8.Qe2 Qc7 
9.Nc3 Bd6 10.dxc5 Bxc5 11.b3 O-O 12.Bb2 b6 13.Ng5 Bb7 14.Nce4 Nxe4 15.Nxe4
Ne5 16.Nxc5 Qxc5 17.Rac1 Nxc4 18.Rxc4 Qe7 19.Qh5 f6 20.Rh4 g6 21.Qh6 Rf7 
22.Rd4 Rd8 23.Rfd1 Rff8 24.h4 Rd5 25.e4 Rxd4 26.Rxd4 e5 27.Ba3 Qxa3 28.Rd7
Rf7 29.Rxf7 Kxf7 30.Qxh7+ Kf8 31.Qxb7 Qc1+ 32.Kh2 Qf4+ 33.Kh3 Qxf2 34.Qxa6
Qe3+ 35.g3 Qxe4 36.Qxb6 Qh1+ 37.Kg4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Quinteros, Miguel Angel"]
[Black "Smejkal, Jan"]
[WhiteElo "2520"]
[BlackElo "2595"]
[Result "0-1"]
[ECO "A15"]
[EventDate "1973.07.10"]
[PlyCount "68"]

1.Nf3 Nf6 2.c4 g6 3.b4 Bg7 4.Bb2 O-O 5.e3 c6 6.a4 d5 7.c5 Bg4 8.Be2 Nbd7 
9.d4 Re8 10.O-O Bxf3 11.gxf3 e5 12.Nd2 exd4 13.Bxd4 Nf8 14.Nb3 Ne6 15.b5 
Nh5 16.Rc1 Nhf4 17.exf4 Nxf4 18.Kh1 Nxe2 19.Rc2 Nxd4 20.Nxd4 Qh4 21.Rd2 
Be5 22.f4 Bxf4 23.Nf3 Qh3 24.Rd3 Re4 25.Rg1 Rae8 26.Rg2 Qf5 27.Rg1 Re2 28.
Rg2 R8e4 29.Qb3 Qh5 30.a5 Re1+ 31.Rg1 Qh3 32.Qc3 Rxg1+ 33.Kxg1 Rc4 34.Qb3 
Rc1+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Ribli, Zoltan"]
[Black "Andersson, Ulf"]
[WhiteElo "2525"]
[BlackElo "2555"]
[Result "1/2-1/2"]
[ECO "A07"]
[EventDate "1973.07.10"]
[PlyCount "129"]

1.Nf3 Nf6 2.g3 d5 3.Bg2 c6 4.O-O Bg4 5.d3 Nbd7 6.Nbd2 e6 7.b3 a5 8.a3 Be7 
9.Bb2 h6 10.h3 Bh5 11.e4 O-O 12.Qe2 dxe4 13.dxe4 Qc7 14.g4 Bg6 15.Ne1 e5 
16.Nd3 Rfe8 17.Rad1 Bf8 18.Qe3 Rad8 19.Rfe1 b6 20.Qg3 Nh7 21.Nc4 f6 22.f4 
b5 23.f5 bxc4 24.fxg6 cxd3 25.gxh7+ Kxh7 26.cxd3 Qb6+ 27.d4 exd4 28.Bxd4 
Bc5 29.Bxc5 Qxc5+ 30.Kh1 Ne5 31.h4 Qc2 32.Rxd8 Rxd8 33.g5 Qd3 34.Qf2 Qd2 
35.Re2 Qc1+ 36.Re1 Qd2 37.Re2 Qc1+ 38.Re1 Rd1 39.Qf5+ g6 40.Rxd1 Qxd1+ 41.
Qf1 Qxf1+ 42.Bxf1 fxg5 43.hxg5 c5 44.gxh6 Kxh6 45.Kg2 Kg5 46.Kg3 Nf7 47.
Bc4 Nd6 48.Bd3 Nf7 49.Bc4 Ne5 50.Bf1 Kf6 51.Kf4 Nf7 52.Be2 g5+ 53.Kg4 Ke5 
54.Bf3 Kd4 55.Kf5 Nd6+ 56.Kxg5 Nxe4+ 57.Kf4 Nd2 58.Bd1 Kc3 59.b4 cxb4 60.
axb4 axb4 61.Ba4 Nc4 62.Kf3 Nb2 63.Bd7 b3 64.Be6 Nc4 65.Ke2 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Spassky, Boris"]
[Black "Enklaar, Bertus"]
[WhiteElo "2655"]
[BlackElo "2445"]
[Result "1/2-1/2"]
[ECO "B80"]
[EventDate "1973.07.10"]
[PlyCount "93"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 d6 6.Be3 Nf6 7.Bd3 Be7 8.O-O 
O-O 9.f4 Nxd4 10.Bxd4 e5 11.fxe5 dxe5 12.Bxe5 Ng4 13.Bf4 Bc5+ 14.Kh1 Nf2+ 
15.Rxf2 Bxf2 16.Qf3 Bb6 17.e5 Qh4 18.Rf1 Be6 19.Qxb7 Rab8 20.Qe4 Rfd8 21.
Bg3 Qxe4 22.Nxe4 Bxa2 23.e6 Bxe6 24.Bxb8 Rxb8 25.Ng5 h6 26.Nxe6 fxe6 27.g3
Bd4 28.b3 Bf6 29.Rf4 Kf7 30.Ra4 Rb7 31.Kg2 Be5 32.Kf3 Kf6 33.h4 h5 34.g4 
hxg4+ 35.Rxg4 Rd7 36.Ke3 Bc7 37.c3 Be5 38.Kd2 Rc7 39.c4 a5 40.Ke3 Rb7 41.
Bc2 Rc7 42.h5 Bb2 43.Ke2 Rc5 44.h6 gxh6 45.Rg6+ Ke7 46.Rxh6 Rg5 47.Be4 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Szabo, Laszlo"]
[Black "Donner, Jan"]
[WhiteElo "2565"]
[BlackElo "2480"]
[Result "1-0"]
[ECO "D42"]
[EventDate "1973.07.10"]
[PlyCount "128"]

1.c4 Nf6 2.Nc3 c5 3.Nf3 d5 4.cxd5 Nxd5 5.e3 e6 6.d4 Nc6 7.Bd3 Be7 8.O-O 
O-O 9.Qe2 b6 10.Rd1 Bb7 11.dxc5 Bxc5 12.Nxd5 exd5 13.Bd2 Qe7 14.Bc3 Rfe8 
15.Ba6 Rad8 16.Bxb7 Qxb7 17.Qc2 f6 18.Qb3 Qf7 19.Rd3 Rd7 20.Rad1 Red8 21.
Qa4 Qe6 22.b4 Bd6 23.Qb3 Ne7 24.Nd4 Qf7 25.Qa4 Be5 26.Nf3 Bxc3 27.Rxc3 Qe6
28.Nd4 Qe5 29.Rdc1 h5 30.h3 Rb7 31.b5 Rbd7 32.Qd1 g6 33.R1c2 Re8 34.Qd3 
Kf7 35.Rc1 Red8 36.Qc2 Re8 37.Qb3 Red8 38.a4 Re8 39.Qa2 Rb8 40.R3c2 Kg7 
41.Qa3 Kf7 42.a5 bxa5 43.Nc6 Nxc6 44.bxc6 Rc7 45.Qxa5 Rb6 46.Rc5 Qb2 47.
Rd1 Qb4 48.Qxb4 Rxb4 49.Rcxd5 Rxc6 50.Rd7+ Ke6 51.Rxa7 Rb2 52.h4 Rcc2 53.
Ra6+ Ke7 54.Rf1 Kf7 55.g3 Ke7 56.Ra7+ Ke6 57.Rg7 Kf5 58.e4+ Kxe4 59.Rxg6 
Rc6 60.Re1+ Kd4 61.Re3 Rb5 62.Rf3 Ke5 63.Rh6 Rbb6 64.Rxh5+ Ke6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "7"]
[White "Timman, Jan"]
[Black "Langeweg, Christian"]
[WhiteElo "2470"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "B89"]
[EventDate "1973.07.10"]
[PlyCount "73"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 d6 6.Bc4 Nf6 7.Be3 Be7 8.Qe2 
a6 9.O-O-O Qc7 10.f4 O-O 11.Bb3 Na5 12.g4 b5 13.g5 Nxb3+ 14.axb3 Nd7 15.f5
Ne5 16.h4 Bd7 17.h5 b4 18.Na2 a5 19.g6 exf5 20.exf5 Bf6 21.h6 fxg6 22.Qg2 
Rac8 23.Qd5+ Rf7 24.hxg7 Bxf5 25.Rd2 Qb7 26.Nxf5 gxf5 27.Qxb7 Rxb7 28.Rxd6
Bxg7 29.Rd5 Ra8 30.Bd4 Ng6 31.Bxg7 Kxg7 32.Rxf5 a4 33.Rfh5 Kg8 34.Kb1 axb3
35.cxb3 Raa7 36.Rd5 Rb6 37.Rhd1 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Andersson, Ulf"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2555"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "B52"]
[EventDate "1973.07.10"]
[PlyCount "31"]

1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 4.Bxd7+ Qxd7 5.c4 e5 6.Nc3 Nc6 7.d3 Nge7 8.O-O
g6 9.Nd5 Bg7 10.Bg5 Nxd5 11.cxd5 Nd4 12.Nxd4 cxd4 13.Qb3 O-O 14.Bd2 f5 15.
f3 f4 16.Rac1 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Donner, Jan"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2480"]
[BlackElo "2520"]
[Result "1/2-1/2"]
[ECO "E92"]
[EventDate "1973.07.10"]
[PlyCount "93"]

1.d4 Nf6 2.c4 c5 3.d5 g6 4.Nc3 d6 5.e4 Bg7 6.Be2 O-O 7.Nf3 e5 8.Bg5 h6 9.
Bh4 Qc7 10.Nd2 Nh7 11.g4 a6 12.f3 Nd7 13.Bf2 Ndf6 14.Be3 h5 15.h3 Rb8 16.
a3 b6 17.b4 Bd7 18.Bd3 Rfc8 19.Qe2 Qd8 20.Qf2 Bf8 21.Ke2 h4 22.Rhb1 Ne8 
23.Rb2 Ng5 24.Qg2 Be7 25.Rab1 cxb4 26.axb4 b5 27.Rc2 Rc7 28.cxb5 axb5 29.
Nb3 Nh7 30.Kf1 Bg5 31.Qd2 Qf6 32.Kg2 Bf4 33.Bxf4 exf4 34.Rbc1 g5 35.Na5 
Qe5 36.Ne2 Rxc2 37.Rxc2 Nf8 38.Nc6 Bxc6 39.Rxc6 Ng6 40.Nc3 Qd4 41.Ne2 Qa7 
42.Rc2 Ne5 43.Ra2 Qb6 44.Nc3 Qd4 45.Be2 Qxb4 46.Rb2 Qa5 47.Nxb5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Langeweg, Christian"]
[Black "Ribli, Zoltan"]
[WhiteElo "2430"]
[BlackElo "2525"]
[Result "1/2-1/2"]
[ECO "A14"]
[EventDate "1973.07.10"]
[PlyCount "79"]

1.Nf3 Nf6 2.g3 d5 3.Bg2 e6 4.O-O Be7 5.c4 O-O 6.b3 Nbd7 7.Bb2 b6 8.Nc3 c6 
9.d3 Bb7 10.Qd2 Re8 11.Rad1 Qc7 12.e4 dxc4 13.dxc4 Rad8 14.Qe2 e5 15.Rd2 
Nf8 16.Rfd1 Rxd2 17.Rxd2 Bc8 18.h3 Ne6 19.Nd1 Nd7 20.Ne3 f6 21.Nc2 Rd8 22.
Nfe1 Ndc5 23.h4 a5 24.Qd1 Ba6 25.Rxd8+ Qxd8 26.Qxd8+ Bxd8 27.f3 Be7 28.Bf1
Kf7 29.Be2 Nc7 30.Bc1 Bc8 31.Ne3 Be6 32.Bd2 N5a6 33.Nd3 Nb4 34.Nc1 Bc5 35.
Kg2 Bxe3 36.Bxe3 c5 37.Bd1 Ne8 38.a3 Nc6 39.a4 Nd6 40.Ne2 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Marovic, Drazen"]
[Black "Petrosian, Tigran"]
[WhiteElo "2480"]
[BlackElo "2640"]
[Result "1-0"]
[ECO "E62"]
[EventDate "1973.07.10"]
[PlyCount "81"]

1.c4 g6 2.Nf3 Bg7 3.d4 d6 4.Nc3 Nf6 5.g3 O-O 6.Bg2 c6 7.O-O Qa5 8.h3 Bf5 
9.Nd2 e5 10.d5 c5 11.a3 Na6 12.e4 Bd7 13.Nb3 Qd8 14.Bg5 Qe8 15.Kh2 h5 16.
Re1 Nh7 17.Be3 Qd8 18.Nd2 b6 19.f4 h4 20.gxh4 Qxh4 21.Nf3 Qe7 22.Qd2 Rad8 
23.fxe5 dxe5 24.Re2 Bc8 25.Nb5 f5 26.exf5 gxf5 27.d6 Qf6 28.Bf2 e4 29.Bh4 
Qg6 30.Ng5 Nf6 31.Rg1 Kh8 32.Qe1 Nh5 33.Nxe4 fxe4 34.Bxe4 Qe6 35.Re3 Rde8 
36.Be7 Rf5 37.Bxf5 Qxf5 38.Rg5 Qf7 39.Qh4 Kg8 40.Rxh5 Bxh3 41.Kxh3 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Planinc, Albin"]
[Black "Timman, Jan"]
[WhiteElo "2525"]
[BlackElo "2470"]
[Result "1-0"]
[ECO "C19"]
[EventDate "1973.07.10"]
[PlyCount "71"]

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Nf3 Nbc6 8.Be2 
Qa5 9.Bd2 c4 10.Ng5 h6 11.Nh3 Ng6 12.a4 Bd7 13.O-O O-O-O 14.Bh5 Nce7 15.
Qe1 Kb8 16.f4 Ka8 17.Bc1 f5 18.exf6 gxf6 19.f5 exf5 20.Ba3 Rhe8 21.Qd2 Rg8
22.Bb4 Qc7 23.Rae1 Bxa4 24.Nf4 Qd7 25.Rf2 b6 26.Rfe2 Nxf4 27.Rxe7 Nxg2 28.
Rxd7 Nxe1+ 29.Kf1 Rxd7 30.Qxe1 Rg5 31.h4 Rxh5 32.Qe8+ Kb7 33.Qxh5 a5 34.
Bf8 Bxc2 35.Qxh6 Be4 36.Qxf6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Radulov, Ivan"]
[Black "Enklaar, Bertus"]
[WhiteElo "2530"]
[BlackElo "2445"]
[Result "1/2-1/2"]
[ECO "A04"]
[EventDate "1973.07.10"]
[PlyCount "126"]

1.e4 c5 2.Nf3 e6 3.d3 Nc6 4.g3 g6 5.Bg2 Bg7 6.O-O Nge7 7.c3 e5 8.Be3 d6 9.
d4 exd4 10.cxd4 Bg4 11.dxc5 dxc5 12.Nc3 b6 13.h3 Be6 14.Qa4 O-O 15.Rfd1 
Qc8 16.Kh2 a6 17.Nd5 Qb7 18.Rd2 h6 19.Rad1 g5 20.a3 Rac8 21.Qb3 Rb8 22.Bf1
Rfc8 23.Qd3 c4 24.Qxc4 Nd4 25.Bxd4 Rxc4 26.Bxc4 b5 27.Ba2 Nc6 28.Bxg7 Kxg7
29.Rc1 Rc8 30.Rdc2 Kf8 31.Kg2 f5 32.exf5 Bxf5 33.Rc3 Be6 34.Rc5 a5 35.Bb1 
Ne7 36.Nxe7 Kxe7 37.Rxc8 Bxc8 38.Be4 Qd7 39.Ne5 Qxh3+ 40.Kg1 Be6 41.Rc5 a4
42.Rxb5 Qh5 43.Bf3 Qe8 44.Rb4 Kd6 45.Nc4+ Kc5 46.Nd2 Bd5 47.Ne4+ Bxe4 48.
Rxe4 Qf7 49.Kg2 Qb3 50.Rb4 Qc2 51.Bh5 Qd2 52.Bg4 Qd5+ 53.Bf3 Qd7 54.Re4 
Kb6 55.Rc4 Qe8 56.Bd1 Qa8+ 57.Kg1 Qd5 58.Rb4+ Kc7 59.Bxa4 h5 60.Bc2 h4 61.
Be4 Qe5 62.Kg2 hxg3 63.fxg3 g4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Ree, Hans"]
[Black "Szabo, Laszlo"]
[WhiteElo "2440"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "B96"]
[EventDate "1973.07.10"]
[PlyCount "51"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Nbd7 8.Bc4 
Qb6 9.Bb3 Be7 10.f5 Nc5 11.fxe6 fxe6 12.Na4 Qa5+ 13.Bd2 Qc7 14.Nxc5 Qxc5 
15.Be3 e5 16.Nf5 Qb4+ 17.Qd2 Qxd2+ 18.Bxd2 Bf8 19.Ne3 Bd7 20.Nd5 Nxd5 21.
Bxd5 Bc6 22.c4 Bxd5 23.cxd5 Rc8 24.Rc1 Rxc1+ 25.Bxc1 Be7 26.Be3 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "8"]
[White "Smejkal, Jan"]
[Black "Spassky, Boris"]
[WhiteElo "2595"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "A09"]
[EventDate "1973.07.10"]
[PlyCount "31"]

1.Nf3 d5 2.c4 d4 3.b4 g6 4.Bb2 Bg7 5.g3 e5 6.d3 a5 7.b5 b6 8.Bg2 Bb7 9.O-O
Ne7 10.e3 dxe3 11.fxe3 O-O 12.e4 Nd7 13.Nc3 Nc8 14.Qe2 Nd6 15.Bh3 f5 16.
exf5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Enklaar, Bertus"]
[Black "Smejkal, Jan"]
[WhiteElo "2445"]
[BlackElo "2595"]
[Result "1/2-1/2"]
[ECO "B93"]
[EventDate "1973.07.10"]
[PlyCount "80"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4 Qc7 7.Bd3 e5 8.Nf3 b5 
9.O-O Nbd7 10.Qe1 Bb7 11.Kh1 g6 12.a4 b4 13.Nd1 Nc5 14.Nf2 Nxd3 15.cxd3 a5
16.d4 Bg7 17.fxe5 dxe5 18.dxe5 Nd7 19.Bf4 O-O 20.Rc1 Qb6 21.Rd1 Nc5 22.Rd6
Qc7 23.Qe3 Ne6 24.Rc1 Qe7 25.Bg3 Rfc8 26.Rcd1 Qe8 27.Ng4 Qxa4 28.Nf6+ Bxf6
29.exf6 Rd8 30.Rxd8+ Rxd8 31.Rxd8+ Nxd8 32.h4 Ne6 33.Kh2 Qc6 34.Nd2 a4 35.
Qd3 h5 36.Bd6 Qd7 37.Qg3 b3 38.Qe5 Qc6 39.Bb4 Kh7 40.Bc3 Qc7 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Kavalek, Lubomir"]
[Black "Langeweg, Christian"]
[WhiteElo "2565"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "B80"]
[EventDate "1973.07.10"]
[PlyCount "51"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 d6 6.g3 Nf6 7.Bg2 Bd7 8.O-O 
Be7 9.b3 O-O 10.Bb2 a6 11.a4 Qc7 12.Re1 Rfd8 13.Re2 Nxd4 14.Qxd4 Bc6 15.a5
Bf8 16.Na4 Qxa5 17.Nb6 Qh5 18.Qd2 Rab8 19.Bxf6 gxf6 20.Ra5 Qh6 21.Re3 Kh8 
22.Qe2 Be7 23.Rh5 Qg6 24.Nd5 Rd7 25.Nf4 Qg7 26.g4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Petrosian, Tigran"]
[Black "Andersson, Ulf"]
[WhiteElo "2640"]
[BlackElo "2555"]
[Result "1/2-1/2"]
[ECO "D03"]
[EventDate "1973.07.10"]
[PlyCount "34"]

1.d4 Nf6 2.Nf3 e6 3.Bg5 Be7 4.Nbd2 d5 5.e3 Nbd7 6.c3 O-O 7.Bd3 b6 8.b4 Bb7
9.Qb1 h6 10.Bh4 Nh5 11.Bg3 Qc8 12.Be5 Nhf6 13.O-O c5 14.Rc1 Nxe5 15.Nxe5 
Qc7 16.a4 a5 17.b5 Rac8 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Quinteros, Miguel Angel"]
[Black "Ree, Hans"]
[WhiteElo "2520"]
[BlackElo "2440"]
[Result "0-1"]
[ECO "A01"]
[EventDate "1973.07.10"]
[PlyCount "62"]

1.b3 e5 2.Bb2 d6 3.c4 Nf6 4.g3 g6 5.Bg2 Bg7 6.d4 exd4 7.Qxd4 O-O 8.Nc3 Re8
9.Qd2 Nbd7 10.Nh3 Nc5 11.f3 d5 12.O-O-O c6 13.cxd5 cxd5 14.g4 Bd7 15.e3 
Rc8 16.Nf2 Bh6 17.Rde1 Qe7 18.Nfd1 d4 19.Qxd4 Bg7 20.Kb1 Red8 21.e4 Bxg4 
22.Nd5 Rxd5 23.exd5 Bf5+ 24.Ka1 Qd6 25.Bf1 Nh5 26.Re5 Nd7 27.f4 Nxe5 28.
fxe5 Bxe5 29.Qd2 Rc2 30.Qe3 Bxb2+ 31.Nxb2 Qf6 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Ribli, Zoltan"]
[Black "Planinc, Albin"]
[WhiteElo "2525"]
[BlackElo "2525"]
[Result "0-1"]
[ECO "E68"]
[EventDate "1973.07.10"]
[PlyCount "64"]

1.Nf3 g6 2.d4 Bg7 3.c4 Nf6 4.g3 O-O 5.Bg2 d6 6.Nc3 Nbd7 7.O-O e5 8.e4 Re8 
9.h3 exd4 10.Nxd4 Nc5 11.Re1 a5 12.Rb1 c6 13.Bf4 a4 14.b4 axb3 15.axb3 h6 
16.b4 Ne6 17.Nxe6 Bxe6 18.Bxd6 Bxc4 19.e5 Nd7 20.f4 f6 21.b5 fxe5 22.bxc6 
bxc6 23.Bxc6 Ra6 24.Qf3 e4 25.Bxd7 Bd4+ 26.Kh2 Rxd6 27.Nxe4 Rxd7 28.f5 
gxf5 29.Qxf5 Rf8 30.Qh5 Bg7 31.h4 Bd3 32.Rbd1 Bxe4 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Spassky, Boris"]
[Black "Donner, Jan"]
[WhiteElo "2655"]
[BlackElo "2480"]
[Result "0-1"]
[ECO "B96"]
[EventDate "1973.07.10"]
[PlyCount "70"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Nbd7 8.Qf3 
Qc7 9.O-O-O b5 10.Bd3 Bb7 11.Rhe1 h6 12.Qh3 O-O-O 13.f5 e5 14.Ne6 hxg5 15.
Qxh8 fxe6 16.fxe6 Nc5 17.Qh3 g4 18.Qg3 Qe7 19.b4 Nxd3+ 20.Qxd3 Qxe6 21.a4 
bxa4 22.Nd5 Kb8 23.Kb2 Nxd5 24.exd5 Qd7 25.c4 Be7 26.Ka3 Rf8 27.Rf1 Rxf1 
28.Rxf1 Bf6 29.Rb1 Bc8 30.b5 axb5 31.Rxb5+ Kc7 32.Qd2 Kd8 33.Rb6 Qc7 34.
Rc6 Qb8 35.Qa5+ Ke7 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Szabo, Laszlo"]
[Black "Marovic, Drazen"]
[WhiteElo "2565"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "D15"]
[EventDate "1973.07.10"]
[PlyCount "60"]

1.d4 d5 2.c4 c6 3.Nc3 dxc4 4.Nf3 Nf6 5.e3 b5 6.a4 b4 7.Na2 e6 8.Bxc4 Nbd7 
9.O-O Bb7 10.Qe2 Be7 11.b3 O-O 12.Bb2 c5 13.Rac1 Qa5 14.dxc5 Bxc5 15.Rfd1 
Rfd8 16.Nd4 Rac8 17.Nb5 Qb6 18.Bd4 a6 19.Bxc5 Nxc5 20.Nd4 g6 21.f3 e5 22.
Nc2 a5 23.Rxd8+ Rxd8 24.Rd1 Kg7 25.Rxd8 Qxd8 26.Nc1 Bd5 27.Qd2 Qa8 28.Bxd5
Qxd5 29.Qxd5 Nxd5 30.e4 Nb6 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "9"]
[White "Timman, Jan"]
[Black "Radulov, Ivan"]
[WhiteElo "2470"]
[BlackElo "2530"]
[Result "1-0"]
[ECO "D55"]
[EventDate "1973.07.10"]
[PlyCount "71"]

1.Nf3 Nf6 2.c4 e6 3.Nc3 d5 4.d4 Be7 5.Bg5 O-O 6.e3 b6 7.cxd5 exd5 8.Bd3 
Nbd7 9.O-O Bb7 10.Rc1 c5 11.dxc5 bxc5 12.Bb5 Nb6 13.a4 a6 14.Be2 Nbd7 15.
Qb3 c4 16.Qc2 Qb6 17.Nd4 h6 18.Bh4 Rfd8 19.b3 Rac8 20.bxc4 dxc4 21.Rb1 Qa7
22.Nf5 Bf8 23.Rfd1 Ba8 24.Rd4 g6 25.Nd6 Bxd6 26.Rxd6 Qc7 27.Rbd1 Kg7 28.
Qd2 g5 29.Bg3 Qc5 30.h4 Rc6 31.hxg5 hxg5 32.e4 Rxd6 33.Bxd6 Qa5 34.e5 Nh7 
35.Qd4 f6 36.Be7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Andersson, Ulf"]
[Black "Szabo, Laszlo"]
[WhiteElo "2555"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "B06"]
[EventDate "1973.07.10"]
[PlyCount "47"]

1.Nf3 g6 2.e4 Bg7 3.d4 d6 4.Be2 c6 5.O-O Nd7 6.Re1 Qc7 7.Nbd2 Ngf6 8.Bf1 
O-O 9.c3 e5 10.dxe5 Nxe5 11.Nxe5 dxe5 12.Nc4 Be6 13.a4 Rfd8 14.Qc2 Nd7 15.
Be3 Nb6 16.Nxb6 axb6 17.f3 Bf8 18.Qf2 Bc5 19.Bxc5 bxc5 20.Qxc5 Ra5 21.Qb4 
Rda8 22.b3 c5 23.Qa3 b5 24.Qb2 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Donner, Jan"]
[Black "Enklaar, Bertus"]
[WhiteElo "2480"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "E91"]
[EventDate "1973.07.10"]
[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 Re8 9.
dxe6 Bxe6 10.Bf4 Nc6 11.Bxd6 Nd4 12.e5 Nd7 13.Re1 Nc6 14.Qb3 Ndxe5 15.Bxc5
Na5 16.Qb4 b6 17.Be3 Nexc4 18.Bg5 Qc7 19.Nb5 Qb7 20.Nfd4 Bd5 21.b3 Bf8 22.
Qc3 Ne5 23.Qg3 Nac6 24.Nxc6 Bxc6 25.Bf1 Qb8 26.Bf4 f6 27.Nd4 Bd7 28.Bc4+ 
Kh8 29.Bd5 Bd6 30.Bxa8 Qxa8 31.Nf3 Nxf3+ 32.gxf3 Bxf4 33.Qxf4 Bf5 34.Rac1 
Rd8 35.Qc7 Rc8 36.Qe7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Langeweg, Christian"]
[Black "Petrosian, Tigran"]
[WhiteElo "2430"]
[BlackElo "2640"]
[Result "0-1"]
[ECO "A41"]
[EventDate "1973.07.10"]
[PlyCount "102"]

1.Nf3 d6 2.d4 Bg4 3.e4 Nf6 4.Nc3 e6 5.Be2 Be7 6.O-O O-O 7.Bf4 c6 8.h3 Bxf3
9.Bxf3 d5 10.Qd3 a6 11.e5 Nfd7 12.Ne2 b5 13.a4 Nb6 14.axb5 cxb5 15.Ra2 Ra7
16.c3 b4 17.b3 bxc3 18.Qxc3 Qd7 19.Rc1 Rc8 20.Qa1 Rac7 21.Rxc7 Rxc7 22.Bd2
Qc8 23.g3 Rc2 24.Rxc2 Qxc2 25.Qc3 Qxc3 26.Bxc3 Nc6 27.Nc1 Na8 28.Be2 Nc7 
29.Kf1 f5 30.Bd3 Nb5 31.Bxb5 axb5 32.Bb2 h5 33.f3 h4 34.gxh4 Bxh4 35.Nd3 
Bd8 36.Nc1 Bb6 37.Ne2 b4 38.Kg2 Kf7 39.Ba1 Na5 40.Nc1 Kg6 41.Bb2 Kg5 42.
Kg3 f4+ 43.Kg2 Kh4 44.Kh2 g5 45.Kg2 Kh5 46.Kh2 Nc6 47.Ne2 Ne7 48.Kg2 Nf5 
49.Kh2 Kh4 50.Kg2 Ne3+ 51.Kh2 Nc2 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Marovic, Drazen"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2480"]
[BlackElo "2520"]
[Result "1/2-1/2"]
[ECO "E62"]
[EventDate "1973.07.10"]
[PlyCount "124"]

1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.Nc3 d6 6.Nf3 c6 7.O-O Qa5 8.h3 e5 9.
d5 cxd5 10.cxd5 Bd7 11.a3 Na6 12.e4 Rfc8 13.Bd2 Qd8 14.b4 Nc7 15.Qe2 Qe8 
16.a4 b5 17.Rfb1 bxa4 18.b5 Rcb8 19.Bf1 Rb7 20.Rb4 Rab8 21.Rbxa4 Nxb5 22.
Ra5 Nxc3 23.Bxc3 Bb5 24.Qe3 Bxf1 25.Kxf1 Qc8 26.Kg2 Rb3 27.R1a3 Nxe4 28.
Rxb3 Rxb3 29.Qxe4 Rxc3 30.Rxa7 Rc7 31.Ra5 Rc4 32.Qe2 h6 33.Qa2 Rc2 34.Qa4 
Kh7 35.Qh4 Qf5 36.Ra4 Bf6 37.Qb4 Qd3 38.Qb7 Rxf2+ 39.Kxf2 Qc2+ 40.Ke3 Qxa4
41.Qxf7+ Bg7 42.Qe6 Qa3+ 43.Ke2 Qa6+ 44.Kf2 Qa7+ 45.Ke2 Bf8 46.Nh4 Qg7 47.
Kf3 Be7 48.Nxg6 Bf6 49.Nh4 Bxh4 50.gxh4 Qf8+ 51.Ke2 h5 52.Qd7+ Kg6 53.Qe6+
Qf6 54.Qe8+ Qf7 55.Qd8 Qf6 56.Qe8+ Kh6 57.Qc6 e4 58.Qc1+ Kg6 59.Qg1+ Kh7 
60.Qg5 Qf3+ 61.Ke1 Qc3+ 62.Ke2 Qd3+ 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Planinc, Albin"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2525"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "B89"]
[EventDate "1973.07.10"]
[PlyCount "61"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 d6 6.Be3 Nf6 7.Bc4 a6 8.Qe2 
Be7 9.O-O-O Qc7 10.Bb3 O-O 11.g4 Nxd4 12.Rxd4 b5 13.g5 Nd7 14.f4 Nc5 15.f5
exf5 16.exf5 Bxf5 17.Rf1 Qd7 18.Nd5 Rae8 19.Rdf4 Nxb3+ 20.axb3 Bg6 21.h4 
Qh3 22.Qf2 Bd8 23.Bd4 Re4 24.Rxe4 Bxe4 25.Nf4 Qf5 26.Bxg7 Kxg7 27.Nh5+ Kg6
28.Nf4+ Kg7 29.Nh5+ Kg6 30.Nf4+ Kg7 31.Nh5+ 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Radulov, Ivan"]
[Black "Smejkal, Jan"]
[WhiteElo "2530"]
[BlackElo "2595"]
[Result "1/2-1/2"]
[ECO "B52"]
[EventDate "1973.07.10"]
[PlyCount "50"]

1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 4.Bxd7+ Qxd7 5.c4 e5 6.O-O Nc6 7.Nc3 Nge7 8.d3
g6 9.Bg5 Bg7 10.Nd5 Nxd5 11.cxd5 Nd4 12.Nxd4 cxd4 13.f3 O-O 14.Qb3 f5 15.
Bd2 f4 16.Rac1 Rfc8 17.a4 a6 18.Rxc8+ Rxc8 19.Rc1 Rxc1+ 20.Bxc1 Bf8 21.Bd2
g5 22.Qd1 h5 23.b3 Be7 24.Kf1 Kf7 25.Be1 Ke8 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Ree, Hans"]
[Black "Spassky, Boris"]
[WhiteElo "2440"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "A09"]
[EventDate "1973.07.10"]
[PlyCount "53"]

1.Nf3 d5 2.c4 d4 3.e3 c5 4.b4 f6 5.exd4 cxd4 6.d3 e5 7.a3 a5 8.b5 Nd7 9.
Nbd2 Nh6 10.Be2 Be7 11.O-O O-O 12.Ne1 Nf7 13.Bg4 Nd6 14.Be6+ Kh8 15.a4 Nc5
16.Bxc8 Rxc8 17.Ba3 Ne6 18.Nb3 b6 19.Nf3 Nb7 20.Bxe7 Qxe7 21.Re1 Qd7 22.
Nfd2 Rfe8 23.Qf3 Nbc5 24.Nxc5 Nxc5 25.Ne4 f5 26.Nxc5 Rxc5 27.Rad1 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "10"]
[White "Timman, Jan"]
[Black "Ribli, Zoltan"]
[WhiteElo "2470"]
[BlackElo "2525"]
[Result "1-0"]
[ECO "B36"]
[EventDate "1973.07.10"]
[PlyCount "87"]

1.Nf3 c5 2.c4 g6 3.d4 cxd4 4.Nxd4 Nc6 5.e4 Nf6 6.Nc3 d6 7.Be2 Nxd4 8.Qxd4 
Bg7 9.Bg5 h6 10.Be3 O-O 11.Qd2 Kh7 12.O-O Be6 13.Bd4 Rc8 14.b3 a6 15.Qe3 
Nd7 16.Bxg7 Kxg7 17.f4 Qb6 18.Qxb6 Nxb6 19.f5 Bd7 20.Rad1 f6 21.fxg6 Be8 
22.Bg4 Rc5 23.Ne2 Re5 24.Nf4 Bd7 25.Bf5 Rc8 26.Nh5+ Kg8 27.h4 Rcc5 28.Ng3 
Kg7 29.Nh5+ Kg8 30.Ng3 Kg7 31.Rf4 Bxf5 32.exf5 Nd7 33.Kf2 b5 34.Nh5+ Kg8 
35.g4 Nb6 36.Rfd4 bxc4 37.bxc4 Rxc4 38.Rxc4 Nxc4 39.a4 Rc5 40.Rb1 Rc8 41.
Rb7 Kf8 42.g5 hxg5 43.hxg5 Na5 44.g7+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Enklaar, Bertus"]
[Black "Ree, Hans"]
[WhiteElo "2445"]
[BlackElo "2440"]
[Result "1/2-1/2"]
[ECO "C99"]
[EventDate "1973.07.10"]
[PlyCount "82"]

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 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 cxd4 13.cxd4 Nc6 14.a3 Bd7 15.d5 Na5 
16.Nf1 Nh5 17.Ne3 g6 18.Bd2 Nc4 19.Nxc4 Qxc4 20.Rc1 Qc7 21.g4 Ng7 22.Bd3 
Qb7 23.Kh2 Rfc8 24.Qe2 Rxc1 25.Rxc1 Rc8 26.Rg1 Bd8 27.h4 Be7 28.h5 Qb6 29.
Rg2 Rf8 30.Kg1 Qd8 31.Qe3 Qc8 32.hxg6 fxg6 33.Nh2 Qc5 34.Qe2 Bd8 35.Be3 
Qc8 36.Nf1 Qb8 37.Bh6 Bb6 38.Ne3 Rf7 39.Qd2 Qd8 40.Be2 Kh8 41.Nf1 Bd4 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Kavalek, Lubomir"]
[Black "Timman, Jan"]
[WhiteElo "2565"]
[BlackElo "2470"]
[Result "1-0"]
[ECO "B82"]
[EventDate "1973.07.10"]
[PlyCount "231"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 d6 6.f4 Nf6 7.Nf3 Be7 8.Bd3 
O-O 9.O-O Nb4 10.Qe1 b6 11.Qg3 Bb7 12.a3 Nxd3 13.cxd3 Nd7 14.Be3 Nc5 15.
Rad1 Kh8 16.Nd4 Bh4 17.Qh3 Bf6 18.f5 exf5 19.Nxf5 Qd7 20.Rf3 Rad8 21.Bd2 
Ne6 22.Qh5 g6 23.Qh6 Be5 24.Rh3 f6 25.Qxg6 Nd4 26.Rf1 Nxf5 27.Rxf5 Rg8 28.
Qh6 Qg7 29.Qxg7+ Rxg7 30.Rhf3 Bc8 31.Rxf6 Bxf6 32.Rxf6 Rg6 33.Rf2 Be6 34.
Ne2 Kg8 35.Nf4 Rf6 36.Bc3 Rh6 37.h3 d5 38.Rf3 d4 39.Bd2 Bb3 40.Nd5 Re6 41.
Bg5 Rxd5 42.exd5 Bxd5 43.Rf5 Bb7 44.Bf6 Ba6 45.Rg5+ Kf8 46.Bg7+ Ke8 47.
Bxd4 Bxd3 48.Kf2 Re7 49.g4 Rd7 50.Bc3 Rf7+ 51.Ke3 Bf1 52.h4 Bg2 53.h5 Kd7 
54.Be5 Bd5 55.Bf4 Be6 56.Kf3 Rf8 57.Re5 Ke7 58.Kg3 Rg8 59.g5 Kf7 60.Re2 
Bf5 61.Rd2 Re8 62.Rd5 Be4 63.Rd1 Bf5 64.Kf3 Bc2 65.Rd2 Bf5 66.Bg3 Re7 67.
Kf4 Rd7 68.Re2 Rd5 69.Be1 Bd7 70.Bd2 Rf5+ 71.Kg3 Rd5 72.Rf2+ Kg8 73.Be3 
Re5 74.Bf4 Rd5 75.Re2 Rd3+ 76.Be3 Be8 77.Kg4 Bb5 78.Kf3 Be8 79.Ke4 Rd7 80.
Rh2 Re7+ 81.Kf4 Bc6 82.Bd2 Be8 83.Bc3 Rc7 84.Ke5 Re7+ 85.Kd6 Re3 86.Kc7 
Re6 87.Rh4 a5 88.a4 Rc6+ 89.Kb7 Re6 90.h6 b5 91.axb5 Bxb5 92.Bxa5 Ba6+ 93.
Ka7 Bd3 94.Bc3 Re7+ 95.Kb6 Kf7 96.Bf6 Re6+ 97.Kc7 Be4 98.b4 Rc6+ 99.Kd7 
Rc4 100.Kd6 Rc6+ 101.Ke5 Re6+ 102.Kd4 Bg2 103.b5 Rd6+ 104.Kc4 Rd1 105.Rd4 
Bf1+ 106.Kc5 Rc1+ 107.Kb6 Bh3 108.Rb4 Bf5 109.Kb7 Ke6 110.b6 Rc5 111.Kb8 
Kd6 112.b7 Kc6 113.Bd8 Rc2 114.Ba5 Ra2 115.Rb6+ Kd7 116.Bb4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Petrosian, Tigran"]
[Black "Planinc, Albin"]
[WhiteElo "2640"]
[BlackElo "2525"]
[Result "1-0"]
[ECO "A24"]
[EventDate "1973.07.10"]
[PlyCount "77"]

1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.g3 O-O 5.Bg2 d6 6.O-O e5 7.d3 Re8 8.Bd2 c6 
9.Rc1 a5 10.a3 Na6 11.Be3 Rb8 12.Qb3 Nd7 13.Qc2 Ndc5 14.Rfd1 Bf5 15.Rb1 
Ne6 16.b4 Nd4 17.Qa2 axb4 18.axb4 Ra8 19.Qd2 Nc7 20.Bh6 Nxf3+ 21.Bxf3 Bh8 
22.b5 Qd7 23.Rdc1 Be6 24.Qe3 Ra3 25.Bg2 Rc8 26.bxc6 bxc6 27.Rb7 Bg7 28.
Bxg7 Kxg7 29.c5 Ra5 30.cxd6 Qxd6 31.Ne4 Qd4 32.Qxd4 exd4 33.Nd6 Rd8 34.
Nxf7 Bxf7 35.Rxc7 Re5 36.Be4 Rde8 37.R1xc6 Kg8 38.Rd6 Be6 39.Rxd4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Quinteros, Miguel Angel"]
[Black "Andersson, Ulf"]
[WhiteElo "2520"]
[BlackElo "2555"]
[Result "1/2-1/2"]
[ECO "D46"]
[EventDate "1973.07.10"]
[PlyCount "128"]

1.Nf3 Nf6 2.c4 c6 3.Nc3 d5 4.e3 e6 5.d4 Nbd7 6.Bd3 Bd6 7.e4 dxe4 8.Nxe4 
Nxe4 9.Bxe4 h6 10.O-O O-O 11.b3 e5 12.dxe5 Nxe5 13.Bb2 Qf6 14.Kh1 Bg4 15.
Qd4 Rfe8 16.Rae1 Re6 17.Nxe5 Bxe5 18.Bh7+ Kxh7 19.Rxe5 Rxe5 20.Qxe5 Qxe5 
21.Bxe5 Rd8 22.Bf4 Rd3 23.h3 Be6 24.Be3 a5 25.c5 g5 26.Re1 Kg6 27.Kg1 a4 
28.bxa4 Bxa2 29.Re2 Bd5 30.Rd2 Rb3 31.Rd4 f5 32.Bd2 Rb1+ 33.Kh2 Rb2 34.h4 
Rc2 35.hxg5 hxg5 36.Be3 f4 37.Rd2 Rc4 38.Bd4 Rxa4 39.f3 Kf5 40.Bg7 Rc4 41.
Bf8 Rb4 42.Bg7 Rc4 43.Bf8 g4 44.fxg4+ Kxg4 45.Rb2 Kf5 46.Bd6 Re4 47.Kg1 
Rd4 48.Kf2 Rd1 49.Rb4 Rd2+ 50.Ke1 Rxg2 51.Rxf4+ Ke6 52.Rb4 Rg7 53.Kd2 Bg2 
54.Kc3 Rh7 55.Rg4 Bf1 56.Re4+ Kd7 57.Re1 Rf7 58.Bb8 Rf3+ 59.Kb4 Bd3 60.Be5
Bc2 61.Re2 Bf5 62.Rd2+ Ke6 63.Bb8 Be4 64.Rd6+ Ke7 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Ribli, Zoltan"]
[Black "Radulov, Ivan"]
[WhiteElo "2525"]
[BlackElo "2530"]
[Result "1-0"]
[ECO "E18"]
[EventDate "1973.07.10"]
[PlyCount "119"]

1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.d4 b6 6.c4 Bb7 7.Nc3 O-O 8.Ne5 c6 
9.e4 Nbd7 10.Nxc6 Bxc6 11.exd5 exd5 12.cxd5 Bb7 13.d6 Bxg2 14.dxe7 Qxe7 
15.Kxg2 Rfd8 16.Be3 Ne5 17.Qe2 Qb7+ 18.f3 Nc6 19.Rfd1 Rd7 20.Bf2 Rad8 21.
Qc4 h6 22.Rd2 Rc8 23.Qe2 Re8 24.Qf1 g5 25.h3 Red8 26.Rad1 Ne7 27.Qd3 Kg7 
28.Kh2 Ng6 29.d5 Nxd5 30.Qf5 Nge7 31.Bd4+ f6 32.Qe6 Rd6 33.Bxf6+ Kg6 34.
Qe5 Rxf6 35.Nxd5 Nxd5 36.Rxd5 Rxd5 37.Rxd5 Qc6 38.g4 Re6 39.Qf5+ Kg7 40.h4
gxh4 41.Kh3 Qc7 42.f4 Re3+ 43.Kxh4 Qe7+ 44.g5 hxg5+ 45.Qxg5+ Qxg5+ 46.Kxg5
Rg3+ 47.Kf5 Rg2 48.Rd7+ Kg8 49.Rxa7 Rxb2 50.Kg6 Rg2+ 51.Kf6 b5 52.f5 b4 
53.Ra8+ Kh7 54.Ke6 Re2+ 55.Kf7 Re5 56.f6 Rb5 57.Ke8 Re5+ 58.Kf8 Kg6 59.f7 
Rf5 60.Ra7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Smejkal, Jan"]
[Black "Donner, Jan"]
[WhiteElo "2595"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "E18"]
[EventDate "1973.07.10"]
[PlyCount "114"]

1.c4 e6 2.g3 d5 3.Bg2 Nf6 4.Nf3 Be7 5.O-O O-O 6.d4 b6 7.Nc3 Bb7 8.Ne5 c6 
9.e4 dxc4 10.Nxc4 Nbd7 11.Re1 b5 12.Ne3 Nb6 13.e5 Nfd5 14.Ne4 Nd7 15.Qg4 
Kh8 16.Qh5 c5 17.Nxd5 Bxd5 18.Ng5 Bxg5 19.Bxg5 Qe8 20.Bxd5 exd5 21.dxc5 
Nxc5 22.Rad1 Qe6 23.Be3 Rac8 24.Rd4 Rfe8 25.Red1 Red8 26.Rh4 h6 27.Bg5 Rd7
28.Bf6 Kh7 29.Rc1 Rdc7 30.Qg5 Rg8 31.Qe3 d4 32.Qxd4 gxf6 33.Rxc5 Rxc5 34.
Qxc5 fxe5 35.Qxb5 Rd8 36.Ra4 Rd7 37.Qe2 Qd5 38.Qe4+ Qxe4 39.Rxe4 f6 40.Ra4
Kg6 41.Ra6 e4 42.Kf1 Kf5 43.Ke2 h5 44.h4 Rb7 45.b3 Rc7 46.Ra5+ Kg4 47.Ra4 
f5 48.Rc4 Rd7 49.Rc6 Rd3 50.Ra6 Rf3 51.Rxa7 Kh3 52.Kf1 e3 53.Ke2 exf2 54.
Kf1 Kxg3 55.Rg7+ Kxh4 56.Rg2 Rc3 57.Rxf2 Kg3 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Spassky, Boris"]
[Black "Marovic, Drazen"]
[WhiteElo "2655"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "D63"]
[EventDate "1973.07.10"]
[PlyCount "30"]

1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bg5 O-O 6.e3 Nbd7 7.Rc1 a6 8.cxd5 
exd5 9.Bd3 c6 10.O-O Re8 11.a3 a5 12.Rb1 Ne4 13.Bxe4 Bxg5 14.Bd3 Be7 15.b4
Bd6 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "11"]
[White "Szabo, Laszlo"]
[Black "Langeweg, Christian"]
[WhiteElo "2565"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "A13"]
[EventDate "1973.07.10"]
[PlyCount "145"]

1.c4 Nf6 2.Nf3 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Ne5 c6 7.Nxd7 Bxd7 8.
Qxc4 e5 9.O-O Be6 10.Qc3 Bd6 11.d3 O-O 12.Nd2 Nd5 13.Qc2 Nb4 14.Qb1 a5 15.
a3 Na6 16.Nc4 Nc5 17.b4 axb4 18.axb4 Rxa1 19.Qxa1 Nb3 20.Qb2 Bxc4 21.dxc4 
Nxc1 22.Rxc1 Qc7 23.c5 Be7 24.b5 cxb5 25.Qxb5 Rb8 26.Bd5 g6 27.Kg2 Kg7 28.
e4 b6 29.c6 Ra8 30.Rc3 Ra3 31.Bb3 Ra8 32.Rf3 Rf8 33.h4 h5 34.Bd5 Bd6 35.
Qa6 Qb8 36.Rb3 Bc7 37.Bc4 Rd8 38.Rf3 Rf8 39.Rd3 Rd8 40.Rd7 Rxd7 41.cxd7 
Bd8 42.Qa2 Qd6 43.Bxf7 Qxd7 44.Be6 Qe7 45.Bc4 Qf6 46.Qa8 Qd6 47.Qa4 Kf8 
48.Ba2 g5 49.hxg5 Bxg5 50.Qc4 Qf6 51.Qg8+ Ke7 52.Qh7+ Kf8 53.Qxh5 Bd2 54.
Qg4 Be1 55.Qc8+ Kg7 56.Qc7+ Kf8 57.Qc2 Bb4 58.Qc8+ Ke7 59.Qc7+ Kf8 60.Qd7 
Bc5 61.f3 Bd4 62.Bc4 Bc5 63.Qc8+ Ke7 64.Bd5 Bd4 65.Bc4 Bc5 66.Bb5 Kf7 67.
Qe8+ Kg7 68.Bc4 Bf8 69.Qd7+ Be7 70.f4 Qd6 71.Qe8 exf4 72.Qf7+ Kh6 73.gxf4 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Andersson, Ulf"]
[Black "Spassky, Boris"]
[WhiteElo "2555"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "A08"]
[EventDate "1973.07.10"]
[PlyCount "70"]

1.Nf3 d5 2.g3 c5 3.Bg2 Nc6 4.O-O e5 5.d3 f6 6.c4 d4 7.e3 Be6 8.exd4 cxd4 
9.Re1 Bd6 10.Nbd2 Nge7 11.a3 a5 12.Ne4 O-O 13.Bd2 a4 14.b4 axb3 15.Qxb3 
Ra7 16.Nxd6 Qxd6 17.Bb4 Nxb4 18.Qxb4 Qd7 19.Reb1 Nc6 20.Qc5 Rc8 21.Nd2 Rc7
22.Ne4 Ra5 23.Qd6 h6 24.Qxd7 Bxd7 25.Nd6 Nd8 26.Nxb7 Nxb7 27.Bxb7 Kf8 28.
Bd5 Ke7 29.f4 exf4 30.gxf4 Rca7 31.Rb3 Kd6 32.Kf2 Ba4 33.Rb2 Bd7 34.Rb3 
Ba4 35.Rb8 Bd7 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Langeweg, Christian"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2430"]
[BlackElo "2520"]
[Result "1-0"]
[ECO "A05"]
[EventDate "1973.07.10"]
[PlyCount "81"]

1.Nf3 Nf6 2.g3 g6 3.b3 Bg7 4.Bb2 O-O 5.Bg2 a5 6.a4 d5 7.O-O Na6 8.d3 c6 9.
Nbd2 Nc5 10.Re1 Re8 11.e4 Qb6 12.e5 Nfd7 13.d4 Ne6 14.Rb1 Ndf8 15.Nf1 Nc7 
16.Ne3 h6 17.c4 Be6 18.Ba3 Na6 19.Nh4 Rad8 20.c5 Qc7 21.f4 f5 22.Bf1 Bf7 
23.g4 e6 24.Qf3 Qe7 25.Qh3 fxg4 26.Qxg4 Kh8 27.Rb2 h5 28.Qg3 Nh7 29.Rg2 
Bh6 30.Qxg6 Rg8 31.Qxh6 Qxh4 32.Re2 Bg6 33.Ng4 Rdf8 34.Nf6 Rxf6 35.exf6 
Qxf6 36.Re5 Nb4 37.Reg5 Bf7 38.Rxg8+ Bxg8 39.Qxh5 Qxd4+ 40.Rf2 Qg7+ 41.Kh1
1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Marovic, Drazen"]
[Black "Enklaar, Bertus"]
[WhiteElo "2480"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "E69"]
[EventDate "1973.07.10"]
[PlyCount "55"]

1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.Nc3 d6 6.Nf3 Nbd7 7.O-O e5 8.e4 c6 
9.h3 Qb6 10.Re1 Re8 11.d5 c5 12.Be3 Qd8 13.Rf1 Re7 14.Ne1 Ne8 15.Nd3 f5 
16.Qd2 Nef6 17.Bg5 Nb6 18.b3 Qf8 19.f4 exf4 20.Nxf4 fxe4 21.Rae1 e3 22.
Rxe3 Rxe3 23.Qxe3 Ng4 24.hxg4 Bd4 25.Ne6 Bxe3+ 26.Bxe3 Qe8 27.Ne4 Nd7 28.
Bg5 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Planinc, Albin"]
[Black "Szabo, Laszlo"]
[WhiteElo "2525"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "A01"]
[EventDate "1973.07.10"]
[PlyCount "62"]

1.b3 e5 2.Bb2 d6 3.e3 g6 4.Nf3 Bg7 5.d4 e4 6.Nfd2 f5 7.c4 Nf6 8.Nc3 O-O 9.
Qc2 Nc6 10.Be2 Nb4 11.Qb1 f4 12.a3 fxe3 13.fxe3 Nd3+ 14.Bxd3 exd3 15.O-O 
Ng4 16.Qxd3 Qh4 17.h3 Nf2 18.Qe2 Nxh3+ 19.gxh3 Bxh3 20.Qh2 Qg5+ 21.Kh1 
Bxf1 22.Nxf1 Rf3 23.Nd5 Raf8 24.Nf4 Qg4 25.Qg2 Qh4+ 26.Kg1 R8xf4 27.exf4 
Qxf4 28.Re1 Bxd4+ 29.Bxd4 Qxd4+ 30.Kh1 Qh4+ 31.Kg1 Qd4+ 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Radulov, Ivan"]
[Black "Donner, Jan"]
[WhiteElo "2530"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "B09"]
[EventDate "1973.07.10"]
[PlyCount "67"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.Be3 Na6 7.Qd2 c5 8.dxc5 
Nxc5 9.Bxc5 dxc5 10.O-O-O Qxd2+ 11.Rxd2 Bg4 12.Ne5 Be6 13.Bc4 Bxc4 14.Nxc4
Nh5 15.g3 Bxc3 16.bxc3 b5 17.Na5 Nf6 18.Re1 Rfd8 19.Rxd8+ Rxd8 20.e5 Nd5 
21.Rd1 e6 22.c4 bxc4 23.Nxc4 Rb8 24.Rd3 Rb4 25.Ne3 Nxe3 26.Rxe3 Kg7 27.Rc3
Rb5 28.Rd3 h6 29.Rd7 Ra5 30.Kb2 g5 31.c4 Ra4 32.Kb3 Rb4+ 33.Kc3 Ra4 34.Kb3
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Ree, Hans"]
[Black "Smejkal, Jan"]
[WhiteElo "2440"]
[BlackElo "2595"]
[Result "0-1"]
[ECO "D85"]
[EventDate "1973.07.10"]
[PlyCount "82"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.d4 Bg7 6.e4 Nxc3 7.bxc3 c5 8.Be2 
O-O 9.O-O cxd4 10.cxd4 Nc6 11.Be3 Bg4 12.d5 Ne5 13.Nd4 Bxe2 14.Qxe2 Rc8 
15.Rfc1 Qd7 16.h3 Qa4 17.Rab1 Rc4 18.Nf3 Rxc1+ 19.Rxc1 Qxe4 20.Nxe5 Bxe5 
21.Qb5 b6 22.Qd7 a5 23.a4 h5 24.Qc6 Rd8 25.Bxb6 Rxd5 26.Qe8+ Kg7 27.Be3 
Bf6 28.Re1 Qb4 29.Rc1 Qe4 30.Re1 Qb4 31.Rc1 h4 32.Qc6 Qe4 33.Re1 Qb4 34.
Rc1 Re5 35.Qe8 Rh5 36.Qc6 Re5 37.Qc4 Re4 38.Qd5 Qxa4 39.Bb6 Re5 40.Qc4 
Re1+ 41.Kh2 Be5+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Ribli, Zoltan"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2525"]
[BlackElo "2565"]
[Result "0-1"]
[ECO "C75"]
[EventDate "1973.07.10"]
[PlyCount "88"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.O-O Bd7 6.c3 Nf6 7.Re1 g6 8.d4 Qe7 
9.Bg5 Bg7 10.Nbd2 h6 11.Bh4 O-O 12.Nf1 Qe8 13.Bc2 Nh5 14.Ne3 Ne7 15.Qd2 f6
16.h3 Be6 17.c4 Rd8 18.b4 c6 19.Rad1 b5 20.d5 cxd5 21.exd5 Bc8 22.c5 f5 
23.Bxe7 Qxe7 24.c6 g5 25.a4 g4 26.hxg4 fxg4 27.Nh2 g3 28.fxg3 Nxg3 29.Nef1
Nf5 30.axb5 axb5 31.Qd3 Rf6 32.Nf3 Rdf8 33.Qxb5 Qa7+ 34.Kh2 Rg6 35.Re2 Rg4
36.Re4 Nd4 37.Nxd4 exd4 38.Qe2 Be5+ 39.Kh1 Rff4 40.g3 d3 41.Bxd3 Rxf1+ 42.
Qxf1 Rxg3 43.Rxe5 dxe5 44.Qf6 Rh3+ 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "12"]
[White "Timman, Jan"]
[Black "Petrosian, Tigran"]
[WhiteElo "2470"]
[BlackElo "2640"]
[Result "1/2-1/2"]
[ECO "C68"]
[EventDate "1973.07.10"]
[PlyCount "15"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O Qd6 6.d3 f6 7.Nbd2 Be6 8.Nc4 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Donner, Jan"]
[Black "Ree, Hans"]
[WhiteElo "2480"]
[BlackElo "2440"]
[Result "1/2-1/2"]
[ECO "D98"]
[EventDate "1973.07.10"]
[PlyCount "69"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qa4+ Bd7 6.Qb3 dxc4 7.Qxc4 O-O 8.e4 
Bg4 9.Be3 Nfd7 10.Rd1 Nc6 11.Be2 Bxf3 12.gxf3 Nb6 13.Qc5 Qc8 14.f4 Qh3 15.
d5 Nb8 16.Qxe7 N8d7 17.Qg5 Bxc3+ 18.bxc3 Rae8 19.Bf1 h6 20.Qxg6+ fxg6 21.
Bxh3 Rxe4 22.Be6+ Kh7 23.Kf1 Nf6 24.f5 g5 25.d6 Rd8 26.Bxb6 axb6 27.h4 Kg7
28.dxc7 Rxd1+ 29.Kg2 Rg4+ 30.Kf3 Rd3+ 31.Ke2 Rxc3 32.c8=Q Re4+ 33.Kd2 Rxc8
34.Bxc8 Rxh4 35.Rxh4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Enklaar, Bertus"]
[Black "Andersson, Ulf"]
[WhiteElo "2445"]
[BlackElo "2555"]
[Result "1/2-1/2"]
[ECO "B44"]
[EventDate "1973.07.10"]
[PlyCount "80"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.c4 Nf6 7.N1c3 a6 8.Na3 
Be7 9.Be2 O-O 10.O-O b6 11.Be3 Bb7 12.f4 d5 13.cxd5 exd5 14.Nxd5 Nxd5 15.
Qxd5 Qxd5 16.exd5 Nb4 17.Bxb6 Bxd5 18.Nc4 Rfe8 19.a3 Bd8 20.Bf3 Bxc4 21.
Bxd8 Raxd8 22.Rfc1 Rd4 23.axb4 Rxf4 24.Bb7 h6 25.g3 Rd4 26.Rc2 Red8 27.b3 
Bb5 28.Rc8 Rxc8 29.Bxc8 Rd6 30.Bh3 Kf8 31.Bf1 Ke7 32.Bc4 Rf6 33.Rd1 Rf5 
34.Rd4 f6 35.g4 Re5 36.Kf2 h5 37.gxh5 Rxh5 38.h4 Re5 39.Kg3 g6 40.Rg4 g5 
1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Kavalek, Lubomir"]
[Black "Radulov, Ivan"]
[WhiteElo "2565"]
[BlackElo "2530"]
[Result "1-0"]
[ECO "A14"]
[EventDate "1973.07.10"]
[PlyCount "75"]

1.c4 Nf6 2.Nf3 e6 3.g3 b6 4.Bg2 Bb7 5.O-O Be7 6.b3 O-O 7.Bb2 d5 8.e3 c5 9.
Qe2 Nc6 10.Rd1 Qc7 11.Nc3 Rfd8 12.Rac1 Rac8 13.cxd5 Nxd5 14.Nxd5 Rxd5 15.
d4 Rdd8 16.dxc5 Bxc5 17.Ng5 Qe7 18.Qg4 f5 19.Qh5 h6 20.Nh3 Rxd1+ 21.Rxd1 
Rd8 22.Nf4 Qf7 23.Rxd8+ Nxd8 24.Qd1 Qe8 25.Bxb7 Nxb7 26.Qf3 Na5 27.g4 Qf7 
28.h4 Bd6 29.g5 hxg5 30.hxg5 Bxf4 31.exf4 Nb7 32.Ba3 Kh7 33.Qh1+ Kg6 34.
Qc6 Kh5 35.Kh2 Na5 36.Qf3+ Kg6 37.Kg3 Qd7 38.Kh4 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Petrosian, Tigran"]
[Black "Ribli, Zoltan"]
[WhiteElo "2640"]
[BlackElo "2525"]
[Result "1/2-1/2"]
[ECO "A48"]
[EventDate "1973.07.10"]
[PlyCount "57"]

1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 O-O 5.c3 d6 6.e3 Nbd7 7.a4 h6 8.Bxf6 
Bxf6 9.a5 a6 10.Qc2 e5 11.Bc4 Kh8 12.h4 h5 13.Ne4 Bg7 14.Neg5 Qe7 15.Qb3 
e4 16.Nd2 Bh6 17.Nxf7+ Kg7 18.Nxh6 Kxh6 19.Nf1 Nf6 20.f3 exf3 21.gxf3 Ng4 
22.fxg4 Bxg4 23.Be2 Rxf1+ 24.Rxf1 Qxe3 25.Qc2 Re8 26.Rf2 Qg3 27.Qd2+ Kg7 
28.Qf4 Rxe2+ 29.Kf1 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Quinteros, Miguel Angel"]
[Black "Planinc, Albin"]
[WhiteElo "2520"]
[BlackElo "2525"]
[Result "1-0"]
[ECO "E83"]
[EventDate "1973.07.10"]
[PlyCount "71"]

1.c4 g6 2.e4 Bg7 3.d4 d6 4.Nc3 Nf6 5.f3 O-O 6.Be3 Nc6 7.Nge2 a6 8.Qd2 Bd7 
9.Nc1 Re8 10.Nb3 Qb8 11.Be2 b5 12.cxb5 axb5 13.Bxb5 Na5 14.Nxa5 Bxb5 15.b4
c5 16.Rb1 cxd4 17.Bxd4 e5 18.Be3 d5 19.a4 Bxa4 20.exd5 Bb5 21.Ne4 Nxe4 22.
fxe4 f5 23.d6 fxe4 24.Qd5+ Kh8 25.Kf2 Rf8+ 26.Kg3 Bd3 27.Nc6 Qb7 28.Ra1 
Rxa1 29.Rxa1 Qd7 30.h3 Bf6 31.Kh2 h5 32.Ra7 Qf5 33.Ne7 Bxe7 34.dxe7 Re8 
35.Ra8 Bb5 36.Qxb5 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Smejkal, Jan"]
[Black "Marovic, Drazen"]
[WhiteElo "2595"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "C19"]
[EventDate "1973.07.10"]
[PlyCount "149"]

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Qc7 7.Nf3 Ne7 8.Bd3 b6
9.a4 Ba6 10.dxc5 bxc5 11.Bxa6 Nxa6 12.Qe2 Nb8 13.c4 d4 14.O-O Nd7 15.Re1 
h6 16.h4 Rb8 17.h5 Nc6 18.Ra3 Rb4 19.Bd2 Rb2 20.Bc1 Rb4 21.Bd2 Rb2 22.Qe4 
Nb6 23.Bc1 Rb4 24.Qg4 Kf8 25.Nh4 Rg8 26.Rf3 Ke8 27.Qe4 Nxc4 28.Qh7 Ne7 29.
Rg3 d3 30.cxd3 Nxe5 31.Rxg7 Rxg7 32.Qxg7 Nxd3 33.Qh8+ Kd7 34.Rd1 Rxh4 35.
Rxd3+ Nd5 36.Qf6 Qh2+ 37.Kf1 Qh1+ 38.Ke2 Re4+ 39.Kf3 Qxh5+ 40.Kxe4 Qe2+ 
41.Be3 Qxd3+ 42.Kxd3 Nxf6 43.Bxc5 a6 44.Kc4 Kc6 45.Be3 h5 46.Bd4 Nd5 47.g3
f5 48.f4 Ne7 49.Bf6 Nc8 50.Kb4 Nd6 51.Ka5 Ne4 52.Bh4 Kb7 53.Kb4 Kb6 54.
Bd8+ Kc6 55.Bh4 Nc5 56.Ka5 Kb7 57.Be7 Nd7 58.Bd6 Nb6 59.Be7 Nc8 60.Bf6 Nb6
61.Be7 Nd7 62.Bd6 Kc6 63.Be7 Nc5 64.Bh4 Kd5 65.Bf6 Kc4 66.Be7 Kd4 67.Bh4 
Kc3 68.Be7 Kc4 69.Bf8 e5 70.fxe5 f4 71.gxf4 h4 72.e6 Nxe6 73.Bd6 Kd5 74.
Bb8 Nd4 75.Kxa6 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Spassky, Boris"]
[Black "Langeweg, Christian"]
[WhiteElo "2655"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "B44"]
[EventDate "1973.07.10"]
[PlyCount "67"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.c4 Nf6 7.N1c3 a6 8.Na3 
Be7 9.Be2 O-O 10.O-O b6 11.Be3 Bb7 12.Rc1 Ne5 13.f4 Ned7 14.Bf3 Rb8 15.Qe2
Re8 16.Rfd1 Qc7 17.g4 Red8 18.g5 Ne8 19.Nd5 exd5 20.cxd5 Nc5 21.b4 Bc8 22.
bxc5 bxc5 23.Rb1 Bd7 24.Bd2 Qa7 25.Ba5 Rdc8 26.Nc4 Bd8 27.Bc3 Rxb1 28.Rxb1
Rb8 29.Re1 Bb5 30.e5 Bxc4 31.Qxc4 dxe5 32.fxe5 Nc7 33.e6 Ne8 34.d6 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "13"]
[White "Szabo, Laszlo"]
[Black "Timman, Jan"]
[WhiteElo "2565"]
[BlackElo "2470"]
[Result "1-0"]
[ECO "A56"]
[EventDate "1973.07.10"]
[PlyCount "105"]

1.d4 Nf6 2.c4 c5 3.d5 g6 4.Nc3 d6 5.e4 Bg7 6.Nge2 b5 7.cxb5 a6 8.Ng3 O-O 
9.Be2 axb5 10.Nxb5 Ne8 11.O-O Nc7 12.Nc3 Ba6 13.Bf4 Nd7 14.Qd2 Qb8 15.Rab1
Re8 16.Bh6 Bh8 17.Bxa6 Rxa6 18.Nge2 Qb4 19.Qc2 Ne5 20.b3 Nb5 21.Nxb5 Qxb5 
22.a4 Qd3 23.Qxd3 Nxd3 24.Rfd1 c4 25.bxc4 Nc5 26.f3 Rxa4 27.Nd4 Rxc4 28.
Nc6 f5 29.Nxe7+ Kf7 30.Nc6 fxe4 31.fxe4 g5 32.Bxg5 Nxe4 33.h4 Nc3 34.Rf1+ 
Kg6 35.Ne7+ Kh5 36.Rbe1 Bd4+ 37.Kh2 Be5+ 38.Kh3 Rxe7 39.Bxe7 Nxd5 40.g4+ 
Kg6 41.h5+ Kg7 42.Bf8+ Kg8 43.Bh6 Rc3+ 44.Kh4 Bg3+ 45.Kg5 Rc8 46.Re2 Nc3 
47.Re7 d5 48.Rf3 Bd6 49.Rg7+ Kh8 50.Rff7 Be5 51.Rxh7+ Kg8 52.Kf5 Bh8 53.
Re7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Andersson, Ulf"]
[Black "Smejkal, Jan"]
[WhiteElo "2555"]
[BlackElo "2595"]
[Result "1-0"]
[ECO "A26"]
[EventDate "1973.07.10"]
[PlyCount "67"]

1.Nf3 Nf6 2.g3 g6 3.Bg2 Bg7 4.O-O O-O 5.c4 d6 6.Nc3 e5 7.d3 Nc6 8.Rb1 a5 
9.a3 Nh5 10.b4 axb4 11.axb4 f5 12.b5 Ne7 13.Qb3 Kh8 14.Bb2 h6 15.Ra1 Rb8 
16.Nd5 f4 17.Ra7 Kh7 18.Qa2 Bg4 19.Re1 Nf5 20.c5 Bxf3 21.exf3 dxc5 22.Qc4 
Nd4 23.Bxd4 exd4 24.Bh3 fxg3 25.hxg3 Qg5 26.Bg2 Rfe8 27.Rxe8 Rxe8 28.f4 
Re1+ 29.Kh2 Qg4 30.Ra8 Qe2 31.Nc3 Qe6 32.Bd5 Qe7 33.Bg8+ Kh8 34.Bh7+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Kavalek, Lubomir"]
[Black "Petrosian, Tigran"]
[WhiteElo "2565"]
[BlackElo "2640"]
[Result "1/2-1/2"]
[ECO "C11"]
[EventDate "1973.07.10"]
[PlyCount "25"]

1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4 5.Nxe4 Be7 6.Nxf6+ Bxf6 7.Bxf6 Qxf6 
8.c3 O-O 9.Nf3 Nd7 10.Be2 e5 11.dxe5 Nxe5 12.Nxe5 Qxe5 13.O-O 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Langeweg, Christian"]
[Black "Enklaar, Bertus"]
[WhiteElo "2430"]
[BlackElo "2445"]
[Result "0-1"]
[ECO "A05"]
[EventDate "1973.07.10"]
[PlyCount "78"]

1.Nf3 Nf6 2.b3 d6 3.d4 Bg4 4.Bb2 Nbd7 5.e3 c6 6.Be2 Qc7 7.Nbd2 e6 8.O-O 
Be7 9.e4 O-O 10.Re1 Rad8 11.c4 d5 12.e5 Ne8 13.cxd5 cxd5 14.Bd3 Nb8 15.Qb1
g6 16.h3 Bf5 17.Nf1 Nc6 18.Ne3 Bxd3 19.Qxd3 h5 20.Rec1 Qb6 21.Nf1 Rc8 22.
Qe3 Kg7 23.g4 hxg4 24.hxg4 Nc7 25.Ng3 a5 26.Rab1 a4 27.bxa4 Qa6 28.Ba3 
Bxa3 29.Nh5+ Kh7 30.Nf6+ Kg7 31.Nh5+ Kh7 32.Ng5+ Kg8 33.Qh3 gxh5 34.Nh7 
Be7 35.Nf6+ Bxf6 36.exf6 Nxd4 37.Qe3 Kh7 38.Qxd4 Qe2 39.Rxb7 Rg8 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Marovic, Drazen"]
[Black "Donner, Jan"]
[WhiteElo "2480"]
[BlackElo "2480"]
[Result "1-0"]
[ECO "E39"]
[EventDate "1973.07.10"]
[PlyCount "113"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O 6.Be3 Qe7 7.Bg5 Na6 8.Nf3 
Nxc5 9.Nd2 h6 10.Bh4 b6 11.a3 Bxc3 12.Qxc3 g5 13.Bg3 Bb7 14.f3 d5 15.b4 
Ncd7 16.h4 Nh5 17.Bf2 Rac8 18.hxg5 Qxg5 19.Qd4 Ng3 20.Rh3 Nf5 21.Qc3 Qg7 
22.Qxg7+ Kxg7 23.cxd5 exd5 24.g4 Nd6 25.Bd4+ f6 26.e3 Ne5 27.Be2 Rfe8 28.
f4 Nc6 29.Bb2 d4 30.Nb3 Rxe3 31.Rxe3 dxe3 32.Rd1 Rd8 33.b5 Ne7 34.g5 hxg5 
35.fxg5 Ng8 36.Nd4 Re8 37.Nc6 Nf7 38.Rd7 Bc8 39.Rxa7 Kg6 40.Bc4 Be6 41.
Bxe6 Rxe6 42.Ra8 Nxg5 43.Rxg8+ Kh7 44.Rxg5 fxg5 45.Ke2 Re4 46.Bd4 g4 47.
Bxb6 g3 48.Bc7 g2 49.Bh2 Rh4 50.Bg1 Rh1 51.Bxe3 Ra1 52.b6 Rxa3 53.Bg1 Ra2+
54.Kf3 Rb2 55.Na5 Kg6 56.b7 Kf6 57.Bf2 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Planinc, Albin"]
[Black "Spassky, Boris"]
[WhiteElo "2525"]
[BlackElo "2655"]
[Result "1/2-1/2"]
[ECO "C95"]
[EventDate "1973.07.10"]
[PlyCount "80"]

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.Nbd2 Bb7 12.Bc2 Re8 13.b4 Bf8 14.a4 Nb6 15.a5 Nbd7 
16.Bb2 Rb8 17.Rb1 Ba8 18.Ba1 g6 19.c4 exd4 20.cxb5 axb5 21.Nxd4 d5 22.N4f3
dxe4 23.Ng5 e3 24.Bb3 Bd5 25.fxe3 c6 26.e4 Bxb3 27.Qxb3 Qe7 28.Ndf3 h6 29.
e5 Nd5 30.e6 hxg5 31.exd7 Qxd7 32.Ne5 Qd6 33.Qf3 f5 34.Bd4 Nxb4 35.Qb3+ 
Qd5 36.Qxd5+ cxd5 37.Nd7 Rxe1+ 38.Rxe1 Ra8 39.Re6 Nc2 40.Be5 Bb4 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Radulov, Ivan"]
[Black "Ree, Hans"]
[WhiteElo "2530"]
[BlackElo "2440"]
[Result "1-0"]
[ECO "C46"]
[EventDate "1973.07.10"]
[PlyCount "47"]

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.f3 O-O 8.Qd2 
d5 9.Nxc6 bxc6 10.O-O-O Be6 11.Be2 Qb8 12.Bh6 Qb4 13.Bxg7 Kxg7 14.a3 Qa5 
15.g4 dxe4 16.g5 Nd5 17.Qd4+ Kg8 18.Nxe4 Bf5 19.h4 Bxe4 20.fxe4 Nf4 21.Bc4
Rae8 22.Rhf1 Ne6 23.Qd7 Qe5 24.Rxf7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Ribli, Zoltan"]
[Black "Szabo, Laszlo"]
[WhiteElo "2525"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "E62"]
[EventDate "1973.07.10"]
[PlyCount "93"]

1.c4 Nf6 2.Nf3 g6 3.g3 Bg7 4.Bg2 O-O 5.d4 d6 6.O-O c6 7.Nc3 Qa5 8.h3 e5 9.
e4 Be6 10.d5 cxd5 11.cxd5 Bd7 12.Be3 b5 13.a3 b4 14.axb4 Qxb4 15.Qc2 a5 
16.Ra3 a4 17.Ne1 Rc8 18.Nd3 Qb7 19.Rfa1 Na6 20.Qd2 Nc7 21.Nxa4 Nb5 22.Nb6 
Nxa3 23.bxa3 Ra6 24.Nxc8 Qxc8 25.Nb4 Ra4 26.Kh2 h5 27.f3 Ne8 28.Qc1 Qxc1 
29.Bxc1 Nc7 30.Bf1 Bb5 31.Kg2 f5 32.Kf2 Kf7 33.Bb2 Bh6 34.Bxb5 Nxb5 35.Ke2
h4 36.g4 fxg4 37.fxg4 Ke7 38.Kd3 Nc7 39.Kc4 Ra8 40.a4 Rf8 41.g5 Bxg5 42.
Nc6+ Kd7 43.Rg1 Rf4 44.Kd3 Rf3+ 45.Kc2 Rg3 46.Rf1 Bf4 47.Bc3 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "14"]
[White "Timman, Jan"]
[Black "Quinteros, Miguel Angel"]
[WhiteElo "2470"]
[BlackElo "2520"]
[Result "1-0"]
[ECO "B97"]
[EventDate "1973.07.10"]
[PlyCount "57"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 
Qxb2 9.Nb3 Qa3 10.Bxf6 gxf6 11.Be2 Qb4 12.O-O Be7 13.Bh5 Rg8 14.Kh1 Qb6 
15.Rae1 Kf8 16.Re3 Rg7 17.Rff3 Kg8 18.Rg3 Bf8 19.Rxg7+ Bxg7 20.Rd3 Qc7 21.
Rxd6 Bd7 22.e5 Kf8 23.Ne4 fxe5 24.Nbc5 Ke7 25.fxe5 Be8 26.Rxe6+ Kf8 27.
Rxe8+ Kxe8 28.Ne6 Qb6 29.Nd6+ 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Donner, Jan"]
[Black "Andersson, Ulf"]
[WhiteElo "2480"]
[BlackElo "2555"]
[Result "0-1"]
[ECO "E55"]
[EventDate "1973.07.10"]
[PlyCount "138"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 O-O 6.Nf3 d5 7.O-O dxc4 8.Bxc4 
Nbd7 9.Bd3 b6 10.a3 cxd4 11.exd4 Bxc3 12.bxc3 Bb7 13.Re1 Rc8 14.Bd2 Nc5 
15.Be2 Nce4 16.c4 Nxd2 17.Qxd2 Bxf3 18.gxf3 Qd6 19.Qe3 Rfd8 20.Red1 g6 21.
a4 Nh5 22.a5 Ng7 23.c5 bxc5 24.dxc5 Qc7 25.Qc3 e5 26.f4 Ne6 27.fxe5 Qxc5 
28.Qxc5 Rxc5 29.Rxd8+ Nxd8 30.a6 Rxe5 31.Rd1 Nc6 32.Kf1 Kf8 33.Rc1 Nd4 34.
Bd3 Re7 35.Kg2 Rd7 36.Be4 Ke7 37.Rc8 Ne6 38.Bb7 Rd8 39.Rc4 Rd4 40.Rc8 Rd8 
41.Rc4 Rd3 42.f3 h6 43.Kf2 g5 44.Rc8 Rd8 45.Rc2 h5 46.Ke3 h4 47.Rc6 f5 48.
Rc4 Kf6 49.Rc6 Ke5 50.Rc4 Rd1 51.Rc8 Rd8 52.Rc4 h3 53.Rc8 Rxc8 54.Bxc8 Nc5
55.Bb7 Nd7 56.Bc8 Nb6 57.Bb7 Nd7 58.Bc8 Nf8 59.Bb7 Ng6 60.Bc8 Nh4 61.Bb7 
Ng2+ 62.Kf2 Kf4 63.Bc8 Nh4 64.Bb7 Ng6 65.Bc8 Ne5 66.Bb7 g4 67.fxg4 fxg4 
68.Kg1 g3 69.Kh1 Kg4 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Enklaar, Bertus"]
[Black "Planinc, Albin"]
[WhiteElo "2445"]
[BlackElo "2525"]
[Result "0-1"]
[ECO "C78"]
[EventDate "1973.07.10"]
[PlyCount "52"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 6.Bb3 Bb7 7.Re1 Bc5 8.c3 O-O
9.d4 Bb6 10.Bg5 h6 11.Bh4 d6 12.a4 exd4 13.axb5 axb5 14.Rxa8 Bxa8 15.cxd4 
Re8 16.Nc3 g5 17.Bg3 Na5 18.d5 b4 19.Ba4 Re7 20.Na2 Nxe4 21.Nxb4 f5 22.Bc2
Qe8 23.Nd4 f4 24.Nf5 Re5 25.Nxh6+ Kg7 26.Ng4 Nxf2 0-1

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Petrosian, Tigran"]
[Black "Radulov, Ivan"]
[WhiteElo "2640"]
[BlackElo "2530"]
[Result "1-0"]
[ECO "A35"]
[EventDate "1973.07.10"]
[PlyCount "69"]

1.c4 c5 2.Nf3 Nc6 3.Nc3 e5 4.g3 g6 5.a3 Bg7 6.Rb1 Nge7 7.Bg2 a5 8.d3 O-O 
9.Bg5 f6 10.Bd2 d6 11.O-O Be6 12.Ne1 f5 13.Nc2 d5 14.b3 d4 15.Nb5 f4 16.b4
b6 17.bxc5 bxc5 18.a4 Qd7 19.Na1 Bh3 20.Nb3 Bxg2 21.Kxg2 e4 22.Nxc5 f3+ 
23.exf3 exf3+ 24.Qxf3 Rxf3 25.Nxd7 Rxd3 26.Bg5 Nf5 27.g4 h6 28.Nc5 Rc3 29.
Nxc3 dxc3 30.gxf5 hxg5 31.f6 Bf8 32.Ne4 c2 33.Rb2 Nd4 34.Rc1 Re8 35.Nxg5 
1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Quinteros, Miguel Angel"]
[Black "Ribli, Zoltan"]
[WhiteElo "2520"]
[BlackElo "2525"]
[Result "1/2-1/2"]
[ECO "A48"]
[EventDate "1973.07.10"]
[PlyCount "117"]

1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 d6 5.c3 O-O 6.e3 b6 7.a4 a6 8.Be2 Bb7 
9.O-O c5 10.b4 Nbd7 11.Qb3 Qc7 12.Rfc1 e5 13.Qd1 h6 14.Bxf6 Bxf6 15.dxc5 
bxc5 16.e4 d5 17.exd5 Bxd5 18.Nc4 Be6 19.Nfd2 Bg7 20.Ne3 Nb6 21.Ne4 Rfd8 
22.Qf1 cxb4 23.cxb4 Qe7 24.Nc5 a5 25.Nxe6 Qxe6 26.bxa5 Rxa5 27.Bb5 e4 28.
Rc6 Rd6 29.Rxd6 Qxd6 30.Re1 Qb4 31.Rb1 Qd4 32.Qe1 Qc3 33.Qd1 Bd4 34.Rc1 
Qb2 35.Rb1 Qc3 36.Rc1 Qb2 37.Qe1 Bxe3 38.fxe3 Ra7 39.Qc3 Nxa4 40.Qxb2 Nxb2
41.Rb1 Nd3 42.Bxd3 exd3 43.Rd1 Ra3 44.e4 Kg7 45.Kf2 Kf6 46.Ke3 d2+ 47.Ke2 
Ra4 48.Rxd2 Rxe4+ 49.Kf3 Ra4 50.Rd3 Kg5 51.g3 f5 52.h4+ Kh5 53.Rd5 Ra2 54.
Rb5 Ra3+ 55.Kg2 g5 56.hxg5 hxg5 57.Rxf5 Kg4 58.Rf2 Rxg3+ 59.Kh2 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Ree, Hans"]
[Black "Marovic, Drazen"]
[WhiteElo "2440"]
[BlackElo "2480"]
[Result "1/2-1/2"]
[ECO "A15"]
[EventDate "1973.07.10"]
[PlyCount "28"]

1.c4 Nf6 2.g3 c5 3.Bg2 g6 4.Nc3 Bg7 5.e3 O-O 6.Nge2 Nc6 7.O-O d6 8.d4 Bd7 
9.b3 h5 10.h3 Rb8 11.Bb2 a6 12.Qd2 Qc8 13.Kh2 b5 14.cxb5 axb5 1/2-1/2

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Smejkal, Jan"]
[Black "Langeweg, Christian"]
[WhiteElo "2595"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "A07"]
[EventDate "1973.07.10"]
[PlyCount "80"]

1.Nf3 Nf6 2.g3 d5 3.Bg2 c6 4.O-O Bf5 5.d3 e6 6.b3 Be7 7.Bb2 O-O 8.Nbd2 a5 
9.a3 h6 10.c4 Nbd7 11.Qc2 Bh7 12.Bc3 Qb8 13.Qb2 Bd6 14.e4 e5 15.exd5 Bxd3 
16.Rfe1 Re8 17.dxc6 bxc6 18.b4 axb4 19.axb4 Rxa1 20.Rxa1 Bh7 21.c5 Bc7 22.
Nc4 Bd3 23.Ne3 Be4 24.Re1 Qb7 25.Ng4 Nxg4 26.Rxe4 Ngf6 27.Re1 Qb8 28.Bh3 
Qb5 29.Rd1 Re7 30.Nh4 g6 31.Qc1 Kh7 32.Bd2 Ng8 33.Bf1 Qa4 34.Bc4 Ndf6 35.
Be1 e4 36.Bc3 Kg7 37.Rd2 Qa8 38.Ra2 Qe8 39.Qa1 Be5 40.Bxe5 Rxe5 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Spassky, Boris"]
[Black "Timman, Jan"]
[WhiteElo "2655"]
[BlackElo "2470"]
[Result "1-0"]
[ECO "E88"]
[EventDate "1973.07.10"]
[PlyCount "101"]

1.e4 g6 2.d4 d6 3.c4 Bg7 4.Nc3 Nf6 5.f3 O-O 6.Be3 e5 7.d5 c6 8.Bd3 b5 9.
Nge2 bxc4 10.Bxc4 c5 11.O-O Nfd7 12.Bd3 Nb6 13.a3 c4 14.Bc2 N8d7 15.a4 Nc5
16.Nb5 a6 17.Na3 a5 18.Nc3 Ba6 19.Ncb5 Qd7 20.Bxc5 dxc5 21.Qd2 Bxb5 22.
Nxb5 Nc8 23.d6 Na7 24.Qxa5 Nxb5 25.Qxb5 Qxb5 26.axb5 Rab8 27.Ba4 Bh6 28.
Kf2 Bd2 29.Ke2 Bb4 30.Rfd1 c3 31.bxc3 Bxc3 32.Rab1 Rb6 33.Rd5 Bd4 34.Kd3 
Rd8 35.Kc4 Kg7 36.f4 f6 37.g3 Kf7 38.Bc2 Ke6 39.f5+ Kd7 40.fxg6 hxg6 41.
Rf1 Ke6 42.h4 Rdxd6 43.g4 Kf7 44.Rxd6 Rxd6 45.g5 Kg7 46.Rxf6 Rd8 47.b6 Be3
48.b7 Rd4+ 49.Kb5 Rb4+ 50.Kc6 c4 51.Kc7 1-0

[Event "13th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1973.??.??"]
[Round "15"]
[White "Szabo, Laszlo"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2565"]
[BlackElo "2565"]
[Result "1/2-1/2"]
[ECO "D59"]
[EventDate "1973.07.10"]
[PlyCount "48"]

1.c4 e6 2.d4 Nf6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 O-O 6.e3 h6 7.Bh4 b6 8.cxd5 Nxd5
9.Bxe7 Qxe7 10.Nxd5 exd5 11.Rc1 Be6 12.Qa4 c5 13.Qa3 Rc8 14.Bb5 Qb7 15.
dxc5 bxc5 16.Rxc5 Rxc5 17.Qxc5 Na6 18.Bxa6 Qxa6 19.Qa3 Qc4 20.Qc3 Qxa2 21.
O-O Rb8 22.b4 Qa4 23.Ra1 Qxb4 24.Qxb4 Rxb4 1/2-1/2

