[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Adorjan, Andras"]
[Black "Bobotsov, Milko"]
[WhiteElo "2465"]
[BlackElo "2485"]
[Result "1-0"]
[ECO "B44"]
[EventDate "1971.07.13"]
[PlyCount "53"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e6 5.Nb5 d6 6.Bf4 e5 7.Be3 Nf6 8.Bg5 
Qa5+ 9.Qd2 Nxe4 10.Qxa5 Nxa5 11.Be3 Kd7 12.N1c3 Nxc3 13.Nxc3 Be7 14.O-O-O 
Rd8 15.Nd5 Nc6 16.Bb5 Re8 17.Rhf1 Bd8 18.f4 exf4 19.Bxf4 Re6 20.Nc3 Ke7 
21.Bc4 Ne5 22.Bxe6 Bxe6 23.Rfe1 Ba5 24.Bxe5 dxe5 25.Nd5+ Kf8 26.Rxe5 Rd8 
27.b3 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Browne, Walter Shawn"]
[Black "Hartoch, Robert"]
[WhiteElo "2500"]
[BlackElo "2400"]
[Result "1-0"]
[ECO "B46"]
[EventDate "1971.07.13"]
[PlyCount "83"]

1.e4 c5 2.Nf3 e6 3.Nc3 Nc6 4.d4 cxd4 5.Nxd4 a6 6.g3 Nge7 7.Nb3 d6 8.Bg2 
Bd7 9.O-O Nc8 10.a4 Be7 11.a5 O-O 12.Be3 b5 13.axb6 Nxb6 14.Qe2 Nb4 15.
Rfd1 Rc8 16.Na5 Qc7 17.Rd4 d5 18.exd5 N6xd5 19.Nxd5 Nxd5 20.Bxd5 exd5 21.
Bf4 Bd6 22.Bxd6 Qxd6 23.c4 Qb4 24.Qd2 Rb8 25.b3 Be6 26.cxd5 Qxd2 27.Rxd2 
Bd7 28.Ra3 Rfc8 29.Nc4 Bb5 30.Rd4 Kf8 31.Ra1 Rd8 32.Ne3 Ke7 33.b4 g6 34.
Kg2 Kd6 35.g4 Rbc8 36.g5 Re8 37.Rg4 f5 38.gxf6 Ke5 39.Kg3 Rf8 40.Rd1 Rc3 
41.Rdd4 Kd6 42.Kg2 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Donner, Jan"]
[Black "Scholl, Eduard"]
[WhiteElo "2500"]
[BlackElo "2430"]
[Result "0-1"]
[ECO "D87"]
[EventDate "1971.07.13"]
[PlyCount "103"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2
c5 9.O-O Nc6 10.Be3 Na5 11.Bd3 b6 12.Rc1 cxd4 13.cxd4 e6 14.e5 Bb7 15.Nc3 
Rc8 16.Qe2 Qd7 17.Rfd1 Rc7 18.Nb5 Rxc1 19.Rxc1 Rc8 20.Rxc8+ Qxc8 21.Nd6 
Qc3 22.h4 Qa1+ 23.Qf1 Qxf1+ 24.Kxf1 Bd5 25.a4 Nc6 26.f3 f6 27.Ne8 fxe5 28.
Nxg7 Kxg7 29.dxe5 Kf7 30.f4 Nb4 31.Bb5 Bc6 32.Bxc6 Nxc6 33.Ke2 Ke7 34.Kd3 
Kd7 35.Kc4 Ne7 36.g3 Kc6 37.Bg1 h5 38.Be3 a6 39.Bf2 Nf5 40.Be1 Ne3+ 41.Kd3
Nd5 42.Kc4 b5+ 43.axb5+ axb5+ 44.Kb3 Nc7 45.Kb4 Nd5+ 46.Kb3 Nc7 47.Kb4 
Na6+ 48.Ka5 Nc5 49.Bb4 Ne4 50.Be1 Kc5 51.Bb4+ Kc4 52.Be1 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Evans, Larry Melvyn"]
[Black "Ivkov, Borislav"]
[WhiteElo "2550"]
[BlackElo "2560"]
[Result "1/2-1/2"]
[ECO "E11"]
[EventDate "1971.07.13"]
[PlyCount "48"]

1.c4 Nf6 2.d4 e6 3.Nf3 Bb4+ 4.Bd2 Qe7 5.Qc2 Bxd2+ 6.Nbxd2 d6 7.e4 e5 8.d5 
O-O 9.g3 a5 10.Bg2 Nh5 11.O-O Na6 12.Ne1 Nc5 13.Nd3 b6 14.Rae1 Nxd3 15.
Qxd3 Qg5 16.Qe3 Qxe3 17.Rxe3 f5 18.exf5 Bxf5 19.Be4 Bh3 20.Bg2 Bf5 21.Be4 
Bh3 22.Bg2 Bf5 23.Be4 Bh3 24.Bg2 Bf5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Gligoric, Svetozar"]
[Black "Smyslov, Vassily"]
[WhiteElo "2600"]
[BlackElo "2620"]
[Result "0-1"]
[ECO "D07"]
[EventDate "1971.07.13"]
[PlyCount "86"]

1.d4 d5 2.c4 Nc6 3.Nc3 dxc4 4.d5 Ne5 5.Bf4 Ng6 6.Bg3 e5 7.dxe6 Bxe6 8.Nf3 
Nf6 9.Nd4 Bd7 10.e3 Bb4 11.Bxc4 O-O 12.Qc2 c6 13.h3 Qe7 14.O-O Bxc3 15.
bxc3 Ne4 16.Bh2 c5 17.Nf3 Bc6 18.Bd3 f5 19.Rad1 Rad8 20.Be2 Qf6 21.Rxd8 
Rxd8 22.Rc1 h6 23.Bd3 Kh8 24.Ne1 c4 25.Bxe4 fxe4 26.Qe2 b5 27.Bg3 Ne7 28.
Qb2 Nd5 29.Qa3 a5 30.Kh2 h5 31.h4 Qf8 32.Qb2 Nf6 33.Kg1 Ng4 34.Qe2 Qf6 35.
f3 exf3 36.gxf3 Ne5 37.e4 Nd3 38.Rc2 Nxe1 39.Bxe1 Rd3 40.Kg2 Qg6+ 41.Bg3 
Kh7 42.Rc1 Qf6 43.Be1 Qf4 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Langeweg, Christian"]
[Black "Portisch, Lajos"]
[WhiteElo "2425"]
[BlackElo "2630"]
[Result "1-0"]
[ECO "D90"]
[EventDate "1971.07.13"]
[PlyCount "97"]

1.Nf3 Nf6 2.c4 g6 3.d4 Bg7 4.Nc3 d5 5.cxd5 Nxd5 6.Bd2 O-O 7.Rc1 Nb6 8.Bg5 
h6 9.Bh4 g5 10.Bg3 c5 11.e3 cxd4 12.Nxd4 Nc6 13.Nxc6 Qxd1+ 14.Nxd1 bxc6 
15.h4 g4 16.e4 Be6 17.Ba6 Rad8 18.b3 Rd4 19.f3 gxf3 20.gxf3 Bc8 21.Be2 Bb7
22.Rg1 Kh8 23.Ne3 e6 24.Ng4 f5 25.Ne5 Kh7 26.Ng6 Rg8 27.h5 fxe4 28.Bf2 Rd7
29.fxe4 Bb2 30.Rc2 Ba3 31.Bc5 Bxc5 32.Rxc5 Rd4 33.Ra5 a6 34.Re5 Bc8 35.Rf1
Rd6 36.Ra5 Kg7 37.Bxa6 Rd4 38.Rf4 Re8 39.Be2 Nd7 40.Ra7 e5 41.Rg4 Kf6 42.
Bc4 Rxc4 43.bxc4 Nc5 44.Rg2 Nxe4 45.Nh4 Ng5 46.Rf2+ Ke6 47.Nf5 Rd8 48.Ng7+
Kd6 49.Rd2+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Ree, Hans"]
[Black "Keres, Paul"]
[WhiteElo "2430"]
[BlackElo "2615"]
[Result "1/2-1/2"]
[ECO "C68"]
[EventDate "1971.07.13"]
[PlyCount "85"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O Ne7 6.Nxe5 Qd4 7.Nf3 Qxe4 8.
Re1 Qg6 9.Ne5 Qf6 10.d4 Bf5 11.Nc3 O-O-O 12.Qh5 Bg6 13.Qh3+ Qf5 14.Nxg6 
fxg6 15.Qxf5+ gxf5 16.Bg5 Rd7 17.Rad1 h6 18.Bf4 g5 19.Be5 Rh7 20.f3 Ng6 
21.Bg3 Rhe7 22.Bf2 Bg7 23.Kf1 Kd8 24.Ne2 Rf7 25.c3 Bf8 26.Nc1 Bd6 27.Nd3 
Rfe7 28.Bg3 Ke8 29.Rxe7+ Kxe7 30.Re1+ Kf7 31.Ne5+ Bxe5 32.Bxe5 h5 33.h3 h4
34.Bh2 f4 35.Bg1 Ne7 36.Re5 Kf6 37.Ke2 b6 38.Re4 Rd8 39.Bf2 Nf5 40.b3 Nd6 
41.Re5 c5 42.Kd3 Nf5 43.Ke4 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.13"]
[Round "1"]
[White "Uhlmann, Wolfgang"]
[Black "Timman, Jan"]
[WhiteElo "2570"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "D90"]
[EventDate "1971.07.13"]
[PlyCount "81"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qa4+ c6 6.cxd5 Nxd5 7.e4 Nb6 8.Qd1 
Bg4 9.Be3 O-O 10.Be2 N8d7 11.a4 a5 12.Qb3 Be6 13.Qc2 Nc4 14.Bf4 Qb6 15.O-O
Nd6 16.Be3 Bb3 17.Qc1 Nc4 18.Bh6 e5 19.d5 Rac8 20.Re1 Rfe8 21.h3 Nf6 22.
dxc6 Rxc6 23.Bg5 Nd6 24.Qb1 Qb4 25.Bf1 Nd7 26.Bd2 Nc4 27.Nd5 Qc5 28.Bxc4 
Bxc4 29.b4 Qd6 30.b5 Rc5 31.Be3 Bxd5 32.Rd1 Nb6 33.Qb3 Rcc8 34.Bxb6 Qxb6 
35.Qxd5 Rc2 36.Rd2 Rxd2 37.Qxd2 Bf8 38.Qc2 Bc5 39.Rd1 Rc8 40.Nxe5 Qe6 41.
Nd7 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Bobotsov, Milko"]
[Black "Langeweg, Christian"]
[WhiteElo "2485"]
[BlackElo "2425"]
[Result "1-0"]
[ECO "E13"]
[EventDate "1971.07.13"]
[PlyCount "91"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.Bg5 h6 6.Bh4 Bb4 7.e3 g5 8.Bg3 Ne4 
9.Qc2 d6 10.Bd3 Bxc3+ 11.bxc3 f5 12.d5 Nd7 13.Bxe4 fxe4 14.Qxe4 Qf6 15.O-O
O-O-O 16.Qxe6 Qxe6 17.dxe6 Nc5 18.Nd4 Rde8 19.f3 Ba6 20.Nb5 Rxe6 21.e4 h5 
22.Nxa7+ Kb7 23.Nb5 g4 24.Bf2 Nd3 25.Bd4 Rg8 26.Kh1 Nb2 27.a4 Nxc4 28.fxg4
Rxg4 29.Rf7 Bxb5 30.axb5 Rgxe4 31.h3 Rg6 32.Raf1 Nd2 33.R1f6 Re1+ 34.Kh2 
Rg8 35.Rf2 Ne4 36.R2f4 Re2 37.Rg7 Rxg7 38.Bxg7 Re1 39.Bd4 Nd2 40.Kg3 Rb1 
41.Rf5 Rb3 42.Rxh5 Ne4+ 43.Kf4 Nxc3 44.Bxc3 Rxc3 45.g4 c5 46.Rh7+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Browne, Walter Shawn"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2500"]
[BlackElo "2550"]
[Result "0-1"]
[ECO "D86"]
[EventDate "1971.07.13"]
[PlyCount "80"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2
Nc6 9.Ba3 b6 10.O-O Bb7 11.Rc1 Qd7 12.Qc2 Rfd8 13.Rfd1 Na5 14.Bd3 Bc6 15.
Qb1 Ba4 16.Rf1 e6 17.Bb4 c5 18.Bxa5 bxa5 19.Bc2 Rab8 20.Bxa4 Qxa4 21.Qc2 
Qxc2 22.Rxc2 cxd4 23.cxd4 Bxd4 24.Nxd4 Rxd4 25.f3 a4 26.g3 a3 27.Rff2 Rd1+
28.Kg2 Rbb1 29.Rc3 Rg1+ 30.Kh3 Rb2 31.Rfc2 Kg7 32.Kg4 e5 33.f4 exf4 34.
Kxf4 Ra1 35.h4 Raxa2 36.Rc1 Rb6 37.Rc7 Ra6 38.Ke3 Rg2 39.Kf3 Rb2 40.R1c6 
Rbb6 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Hartoch, Robert"]
[Black "Smyslov, Vassily"]
[WhiteElo "2400"]
[BlackElo "2620"]
[Result "0-1"]
[ECO "A48"]
[EventDate "1971.07.13"]
[PlyCount "62"]

1.d4 Nf6 2.Nf3 g6 3.c3 Bg7 4.Bf4 b6 5.Nbd2 Ba6 6.a4 c5 7.a5 Nc6 8.axb6 
axb6 9.e3 Bxf1 10.Nxf1 O-O 11.N1d2 cxd4 12.exd4 Nd5 13.Bg3 f5 14.O-O Rxa1 
15.Qxa1 Qa8 16.c4 Ndb4 17.d5 Nd4 18.Be5 Ne2+ 19.Kh1 Qxa1 20.Rxa1 Nd3 21.g3
Nxe5 22.Nxe5 Bxe5 23.Re1 Bxb2 24.Rxe2 Bf6 25.Nb3 Rc8 26.Rc2 d6 27.Kg2 Kf7 
28.Kf3 g5 29.Ke2 g4 30.Nc1 b5 31.Kd3 Rc5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Ivkov, Borislav"]
[Black "Adorjan, Andras"]
[WhiteElo "2560"]
[BlackElo "2465"]
[Result "1/2-1/2"]
[ECO "B36"]
[EventDate "1971.07.13"]
[PlyCount "43"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Nf6 6.Nc3 d6 7.Be2 Nxd4 8.Qxd4 
Bg7 9.O-O O-O 10.Qe3 Bd7 11.Bd2 a6 12.a4 a5 13.b3 Bc6 14.Rae1 Nd7 15.Bd1 
Nc5 16.Bc2 b6 17.f4 e6 18.Ne2 f5 19.exf5 exf5 20.Bc3 Re8 21.Qd2 Bxc3 22.
Nxc3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Keres, Paul"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2615"]
[BlackElo "2570"]
[Result "1/2-1/2"]
[ECO "C08"]
[EventDate "1971.07.13"]
[PlyCount "30"]

1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5 5.Bb5+ Bd7 6.Bxd7+ Nxd7 7.Ne2 Bd6 8.
dxc5 Nxc5 9.Nb3 Nf6 10.O-O O-O 11.Nxc5 Bxc5 12.Bg5 Re8 13.Ng3 Re5 14.Bf4 
Re6 15.c3 Ne4 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Portisch, Lajos"]
[Black "Donner, Jan"]
[WhiteElo "2630"]
[BlackElo "2500"]
[Result "1-0"]
[ECO "A33"]
[EventDate "1971.07.13"]
[PlyCount "67"]

1.c4 c5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 cxd4 5.Nxd4 e6 6.g3 Qb6 7.Nb3 Bb4 8.Bg2 
Ne5 9.Be3 Qc7 10.c5 Nc4 11.Qd4 Nxe3 12.Qxe3 Rb8 13.O-O Bxc3 14.Qxc3 b6 15.
c6 O-O 16.Nd4 a6 17.Rac1 d6 18.Rfd1 e5 19.Nc2 b5 20.Rd2 Rb6 21.Nb4 a5 22.
Nd5 Nxd5 23.Bxd5 Rb8 24.b4 a4 25.Qd3 Rd8 26.f4 Be6 27.Kh1 g6 28.e4 Bxd5 
29.Qxd5 Kg7 30.Rf2 exf4 31.Rxf4 Re8 32.Rcf1 Re7 33.Rf6 Rf8 34.Rxd6 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Scholl, Eduard"]
[Black "Ree, Hans"]
[WhiteElo "2430"]
[BlackElo "2430"]
[Result "0-1"]
[ECO "B57"]
[EventDate "1971.07.13"]
[PlyCount "108"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bc4 Qb6 7.Nde2 e6 8.O-O 
Be7 9.a3 O-O 10.Ba2 a6 11.Ng3 Rd8 12.h3 Qc7 13.Qe2 b5 14.Bd2 Ne5 15.b3 Nc6
16.b4 d5 17.exd5 exd5 18.Rfd1 Be6 19.f4 Re8 20.Qf2 d4 21.Nce4 Nxe4 22.Nxe4
Bxa2 23.Rxa2 f5 24.Ng5 Bxg5 25.fxg5 Qf7 26.Raa1 Re4 27.Bf4 Rae8 28.Rd2 Qc4
29.Rad1 Re2 30.Qf3 Rxd2 31.Rxd2 Re4 32.Qf2 g6 33.Kh2 Nd8 34.Rd3 Ne6 35.Bc1
Qc7+ 36.Kg1 Qe5 37.Bd2 Re2 38.Qf3 Qe4 39.Kf1 Qxf3+ 40.gxf3 Rh2 41.f4 Kf7 
42.Ke1 Rh1+ 43.Ke2 Ra1 44.c3 Ra2 45.Kd1 Rxa3 46.Kc2 dxc3 47.Bxc3 Nxf4 48.
Rd7+ Ke6 49.Rxh7 Nd5 50.Bd4 Nxb4+ 51.Kb2 Rg3 52.h4 f4 53.h5 gxh5 54.Rxh5 
Kf5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.14"]
[Round "2"]
[White "Timman, Jan"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2445"]
[BlackElo "2600"]
[Result "0-1"]
[ECO "C69"]
[EventDate "1971.07.13"]
[PlyCount "62"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O f6 6.d4 exd4 7.Nxd4 Bd6 8.
Qh5+ g6 9.Qh4 h5 10.e5 fxe5 11.Bg5 Be7 12.Nf3 Bxg5 13.Nxg5 Bf5 14.Nc3 Nh6 
15.Qg3 Nf7 16.Nce4 Nxg5 17.Nxg5 Qf6 18.f4 e4 19.Rad1 Qxb2 20.c3 Qxa2 21.
Qe3 O-O 22.h3 Qa3 23.g4 hxg4 24.hxg4 Bxg4 25.Qxe4 Qc5+ 26.Rf2 Rf6 27.Rd4 
Raf8 28.Rg2 Bc8 29.Rh2 Qxc3 30.Rd3 Qc1+ 31.Kg2 Qxf4 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Adorjan, Andras"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2465"]
[BlackElo "2500"]
[Result "0-1"]
[ECO "B50"]
[EventDate "1971.07.13"]
[PlyCount "80"]

1.e4 c5 2.Nf3 d6 3.Nc3 a6 4.a3 Nc6 5.Rb1 Nf6 6.b4 e6 7.bxc5 dxc5 8.g3 b5 
9.d3 Be7 10.Bg2 Bb7 11.O-O O-O 12.Re1 Nd4 13.Nxd4 cxd4 14.Ne2 Qb6 15.Bb2 
Bc5 16.h3 Rac8 17.Nc1 Qa7 18.Nb3 Bb6 19.a4 bxa4 20.Nd2 Bc5 21.Nc4 Bc6 22.
e5 Nd5 23.Qh5 a3 24.Bxa3 Bxa3 25.Nxa3 Nc3 26.Rb2 Bb5 27.Ra1 Qc5 28.h4 Rc7 
29.Kh2 Re7 30.Qg5 h6 31.Qf4 f6 32.exf6 Rxf6 33.Qd2 Ref7 34.f4 e5 35.Nxb5 
axb5 36.Ra8+ Kh7 37.Qe1 exf4 38.Be4+ g6 39.g4 f3 40.h5 Qe5+ 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Donner, Jan"]
[Black "Bobotsov, Milko"]
[WhiteElo "2500"]
[BlackElo "2485"]
[Result "1/2-1/2"]
[ECO "E50"]
[EventDate "1971.07.13"]
[PlyCount "80"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 O-O 6.Nf3 b6 7.O-O Bb7 8.Bd2 d6 
9.Qe2 Bxc3 10.Bxc3 Ne4 11.Be1 Qe7 12.Nd2 f5 13.f3 Nxd2 14.Bxd2 e5 15.dxe5 
dxe5 16.Bc3 Nc6 17.a3 Rad8 18.Bc2 g6 19.Rae1 Rd7 20.Qf2 Qf7 21.Ba4 Qxc4 
22.Bxc6 Bxc6 23.Bxe5 Qe6 24.Qg3 Re8 25.Bf4 Bb5 26.Rf2 Red8 27.h4 Rd1 28.
Rxd1 Rxd1+ 29.Kh2 Rd7 30.h5 Kf7 31.Be5 Ke8 32.e4 Kd8 33.Qf4 Bd3 34.exf5 
Qxf5 35.Bf6+ Kc8 36.Qxf5 Bxf5 37.h6 Bd3 38.g4 Kb7 39.Kg3 b5 40.Kf4 Kc6 
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Evans, Larry Melvyn"]
[Black "Hartoch, Robert"]
[WhiteElo "2550"]
[BlackElo "2400"]
[Result "0-1"]
[ECO "B44"]
[EventDate "1971.07.13"]
[PlyCount "92"]

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 Bd7 11.Be3 b6 12.f3 Qb8 13.Rf2 Ra7 14.Nc2 Rb7 15.a4 
Rd8 16.Bf1 Be8 17.Rd2 Nd7 18.Rb1 a5 19.Na3 Nc5 20.Nab5 Nb4 21.g3 Bc6 22.
Nd4 Bd7 23.Bg2 Bc8 24.f4 Rbd7 25.f5 Bf6 26.fxe6 fxe6 27.Ndb5 Be5 28.Bh3 
Rf7 29.Bg5 Rdd7 30.Qe2 h6 31.Be3 Rf6 32.Rf1 Rxf1+ 33.Qxf1 Rd8 34.Qd1 Kh7 
35.Bf4 Bxf4 36.gxf4 d5 37.e5 Rf8 38.cxd5 exd5 39.Bxc8 Qxc8 40.Nxd5 Nxd5 
41.Rxd5 Rxf4 42.Rd4 Ne4 43.Nd6 Qc5 44.Kg2 Rf2+ 45.Kh3 Qxe5 46.Nxe4 Qxh2+ 
0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Gligoric, Svetozar"]
[Black "Keres, Paul"]
[WhiteElo "2600"]
[BlackElo "2615"]
[Result "1/2-1/2"]
[ECO "E19"]
[EventDate "1971.07.13"]
[PlyCount "31"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 8.Qc2 
Nxc3 9.Qxc3 c5 10.b3 cxd4 11.Nxd4 Bxg2 12.Kxg2 Nc6 13.Nxc6 dxc6 14.Bb2 Bf6
15.Qc2 Bxb2 16.Qxb2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Langeweg, Christian"]
[Black "Ivkov, Borislav"]
[WhiteElo "2425"]
[BlackElo "2560"]
[Result "0-1"]
[ECO "A48"]
[EventDate "1971.07.13"]
[PlyCount "62"]

1.Nf3 g6 2.d4 Bg7 3.c3 Nf6 4.Bf4 b6 5.e3 Bb7 6.Nbd2 d6 7.Be2 O-O 8.h3 Nbd7
9.O-O Re8 10.a4 a6 11.Bh2 e5 12.a5 b5 13.c4 exd4 14.Nxd4 bxc4 15.Bxc4 d5 
16.Bb3 c5 17.N4f3 Qe7 18.Ba4 Rec8 19.Qb3 Nb8 20.Rac1 Bc6 21.Ne5 c4 22.Nxc6
Nxc6 23.Qb6 Nd7 24.Qxc6 Rxc6 25.Bxc6 Rd8 26.Bxd5 Nc5 27.e4 Bh6 28.Rc2 Bxd2
29.Rxd2 Nxe4 30.Re1 Qb4 31.Rdd1 Rxd5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Ree, Hans"]
[Black "Portisch, Lajos"]
[WhiteElo "2430"]
[BlackElo "2630"]
[Result "1/2-1/2"]
[ECO "A36"]
[EventDate "1971.07.13"]
[PlyCount "81"]

1.c4 g6 2.g3 Bg7 3.Bg2 c5 4.Nc3 Nc6 5.a3 d6 6.Rb1 a5 7.e3 e5 8.Nge2 Nge7 
9.O-O O-O 10.d3 Rb8 11.Nd5 Nxd5 12.Bxd5 Bh3 13.Re1 Ne7 14.Bh1 b5 15.Nc3 b4
16.axb4 cxb4 17.Nd5 Nxd5 18.Bxd5 b3 19.Ra1 Bd7 20.c5 dxc5 21.Bxb3 h5 22.
Bc4 Kh8 23.Ra2 a4 24.Bd2 Qf6 25.Bd5 Qd6 26.e4 f5 27.f4 fxe4 28.Bxe4 Be6 
29.Qxa4 Bxa2 30.Qxa2 exf4 31.Bxf4 Qd4+ 32.Be3 Rxb2 33.Qe6 Qb4 34.Rf1 Rxf1+
35.Kxf1 Rb1+ 36.Kg2 Qb2+ 37.Kh3 Qf6 38.Qxf6 Bxf6 39.Bxg6 h4 40.Bxc5 hxg3 
41.hxg3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Smyslov, Vassily"]
[Black "Timman, Jan"]
[WhiteElo "2620"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "B08"]
[EventDate "1971.07.13"]
[PlyCount "117"]

1.Nf3 g6 2.d4 Bg7 3.e4 d6 4.Be2 Nf6 5.Nc3 O-O 6.O-O Bg4 7.Bg5 Nc6 8.h3 
Bxf3 9.Bxf3 Nd7 10.Ne2 h6 11.Be3 e5 12.c3 Nb6 13.Qb3 Na5 14.Qc2 Nac4 15.
Bc1 exd4 16.Nxd4 c5 17.Nb3 Qe7 18.Nd2 Rfe8 19.Nxc4 Nxc4 20.Bf4 Rad8 21.
Rad1 b5 22.b3 Ne5 23.Be2 a6 24.a4 Qb7 25.Rd5 g5 26.Be3 Nc6 27.axb5 axb5 
28.b4 Ne7 29.Rd2 cxb4 30.cxb4 d5 31.Rfd1 Rc8 32.Bc5 Nc6 33.Qb3 d4 34.Qd3 
Rb8 35.Qb1 Ra8 36.Bd3 Be5 37.Ra2 Kg7 38.Qb3 Rxa2 39.Qxa2 Ra8 40.Qe2 Ra3 
41.Bxb5 d3 42.Bxd3 Nxb4 43.Bd6 Ra5 44.Bxe5+ Rxe5 45.Qb2 f6 46.Rb1 Qd7 47.
Bc4 Nc6 48.Bd5 Ne7 49.Qb8 Qc8 50.Qa7 Kg6 51.Rb7 Qf8 52.Rb8 Qg7 53.Qa8 Kh7 
54.Bc4 Rc5 55.Bd3 Re5 56.g3 h5 57.Kf1 h4 58.g4 Qf7 59.Rf8 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.15"]
[Round "3"]
[White "Uhlmann, Wolfgang"]
[Black "Scholl, Eduard"]
[WhiteElo "2570"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "A36"]
[EventDate "1971.07.13"]
[PlyCount "64"]

1.c4 c5 2.Nf3 Nf6 3.Nc3 e6 4.g3 Nc6 5.Bg2 d5 6.cxd5 Nxd5 7.Nxd5 Qxd5 8.b3 
Be7 9.Bb2 O-O 10.O-O Qf5 11.Rc1 Rd8 12.d3 Bd7 13.Rc4 f6 14.Nd2 Qh5 15.f4 
Rac8 16.Qe1 b6 17.Qf2 Na5 18.Rcc1 Bc6 19.Qe3 Qf7 20.Bh3 Bd7 21.Nf3 Nc6 22.
Rc4 Nb4 23.Re4 Nd5 24.Qc1 Bf8 25.a4 Re8 26.Rc4 a6 27.Qd2 Rcd8 28.Rcc1 Nb4 
29.Bg2 Bc6 30.Ba3 Bd5 31.Qb2 Qb7 32.Rfd1 a5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Bobotsov, Milko"]
[Black "Ree, Hans"]
[WhiteElo "2485"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "D15"]
[EventDate "1971.07.13"]
[PlyCount "47"]

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e3 b5 6.a4 b4 7.Nb1 Ba6 8.Be2 e6 9.
O-O Be7 10.Nbd2 O-O 11.Bxc4 Bxc4 12.Nxc4 c5 13.Qe2 Nc6 14.dxc5 Bxc5 15.b3 
Qe7 16.Bb2 Rfd8 17.Rad1 Nd5 18.Qc2 Rac8 19.Rd2 Nb6 20.Rfd1 Nxc4 21.Qxc4 
Rxd2 22.Rxd2 Na5 23.Qa6 Nb7 24.g3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Browne, Walter Shawn"]
[Black "Langeweg, Christian"]
[WhiteElo "2500"]
[BlackElo "2425"]
[Result "1/2-1/2"]
[ECO "B80"]
[EventDate "1971.07.13"]
[PlyCount "117"]

1.e4 c5 2.Nf3 e6 3.Nc3 Nc6 4.d4 cxd4 5.Nxd4 Qc7 6.g3 a6 7.Bg2 Nf6 8.O-O 
Be7 9.Re1 d6 10.Nxc6 bxc6 11.e5 dxe5 12.Rxe5 Bb7 13.Re1 c5 14.Bf4 Qc8 15.
Bxb7 Qxb7 16.Na4 c4 17.Qe2 Rc8 18.Be5 O-O 19.Rad1 Rfd8 20.b3 Ne8 21.Rxd8 
Bxd8 22.Nb2 cxb3 23.axb3 Bf6 24.Nc4 Bxe5 25.Qxe5 Qc7 26.Qxc7 Rxc7 27.Kf1 
Kf8 28.Ke2 Ke7 29.Kd3 Rd7+ 30.Kc3 Rb7 31.Ra1 Nc7 32.Kb2 f6 33.Ne3 Rb5 34.
c4 Rh5 35.h4 a5 36.Kc3 Rc5 37.Kd4 Kd6 38.Nd1 e5+ 39.Ke3 f5 40.Nc3 Ke6 41.
f3 Kd6 42.h5 g6 43.hxg6 hxg6 44.g4 Kd7 45.Kd3 Kd6 46.Ra3 e4+ 47.fxe4 fxg4 
48.Nd5 Ne6 49.Ra1 g3 50.Rg1 g2 51.Ke3 a4 52.bxa4 Rxc4 53.Rxg2 Rxa4 54.Rxg6
Ra3+ 55.Kd2 Ke5 56.Nc3 Rxc3 57.Kxc3 Nf4 58.Rg8 Kxe4 59.Re8+ 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Evans, Larry Melvyn"]
[Black "Adorjan, Andras"]
[WhiteElo "2550"]
[BlackElo "2465"]
[Result "1-0"]
[ECO "B21"]
[EventDate "1971.07.13"]
[PlyCount "111"]

1.e4 c5 2.f4 d5 3.exd5 Qxd5 4.Nc3 Qd8 5.Nf3 Nf6 6.Bc4 g6 7.Ne5 e6 8.d3 Bg7
9.Be3 Nfd7 10.Nxd7 Nxd7 11.Qf3 O-O 12.O-O Rb8 13.a4 b6 14.Rad1 Bb7 15.Qe2 
Qh4 16.d4 cxd4 17.Bxd4 Nf6 18.Nb5 Rbd8 19.c3 Ng4 20.h3 Bxd4+ 21.Nxd4 Nf6 
22.Kh2 Ne4 23.Qe3 Qf6 24.Nb5 Rxd1 25.Rxd1 e5 26.fxe5 Qxe5+ 27.Kg1 a6 28.
Nd4 Re8 29.Nf3 Qc7 30.Ba2 Qc5 31.Rd4 Nd6 32.Qf4 Nf5 33.g4 Bxf3 34.Qxf3 
Re1+ 35.Kf2 Ra1 36.Bxf7+ Kxf7 37.gxf5 Rxa4 38.fxg6+ Kxg6 39.Qg4+ Kf6 40.
Qf4+ Kg6 41.Qg4+ Kf6 42.Qf4+ Kg6 43.Qd6+ Qxd6 44.Rxd6+ Kg5 45.Rxb6 Ra1 46.
Ke3 h5 47.b4 Kh4 48.Rh6 a5 49.b5 a4 50.Kd2 a3 51.Ra6 a2 52.c4 Kxh3 53.Kc2 
h4 54.Kb2 Rh1 55.Kxa2 Kg4 56.b6 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Hartoch, Robert"]
[Black "Timman, Jan"]
[WhiteElo "2400"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "A46"]
[EventDate "1971.07.13"]
[PlyCount "75"]

1.d4 Nf6 2.Nf3 e6 3.g3 b5 4.a4 b4 5.Bg2 Bb7 6.O-O Be7 7.c4 O-O 8.b3 Qc8 9.
Bb2 c5 10.e3 d6 11.Nbd2 Ne4 12.Nxe4 Bxe4 13.Ne1 Bxg2 14.Kxg2 Bf6 15.Qd2 
Nc6 16.Rd1 Na5 17.Qc2 Qb7+ 18.d5 Bxb2 19.Qxb2 Rae8 20.Kg1 e5 21.e4 f5 22.
exf5 Rxf5 23.Rd3 Qf7 24.Qe2 e4 25.Re3 Rf8 26.Qc2 g5 27.Qxe4 Rxf2 28.Nf3 
Rxf1+ 29.Kxf1 Qg7 30.Ke2 Kh8 31.Qe6 g4 32.Nd2 Qg6 33.Qxg6 hxg6 34.Re7 a6 
35.Re6 Kg7 36.Rxd6 Rh8 37.Rxa6 Rxh2+ 38.Ke3 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Ivkov, Borislav"]
[Black "Donner, Jan"]
[WhiteElo "2560"]
[BlackElo "2500"]
[Result "1/2-1/2"]
[ECO "E42"]
[EventDate "1971.07.13"]
[PlyCount "112"]

1.c4 Nf6 2.Nc3 e6 3.d4 Bb4 4.e3 c5 5.Ne2 d5 6.a3 Ba5 7.dxc5 dxc4 8.Qxd8+ 
Kxd8 9.Bd2 Nbd7 10.Ng3 Nxc5 11.Bxc4 Bc7 12.Rd1 a6 13.e4 Bd7 14.f4 Bc6 15.
e5 Nfd7 16.Be3 Ke7 17.O-O Rhc8 18.Ba2 Bb6 19.Rfe1 Na4 20.Nxa4 Bxe3+ 21.
Rxe3 Bxa4 22.Rd2 Rc1+ 23.Kf2 Rac8 24.Ne4 R8c2 25.Rxc2 Rxc2+ 26.Re2 Rxe2+ 
27.Kxe2 Bc6 28.Ke3 Nb6 29.g3 Na4 30.b3 Bxe4 31.bxa4 Bc2 32.a5 Kd7 33.Kd4 
Kc6 34.Bc4 Bf5 35.Be2 b6 36.g4 Bb1 37.Bxa6 bxa5 38.a4 h6 39.Bb5+ Kb6 40.h4
Bc2 41.Be8 Bd1 42.g5 hxg5 43.hxg5 Bg4 44.Bxf7 Bf5 45.Be8 g6 46.Bb5 Bc2 47.
Bc4 Bf5 48.Bb3 Kc6 49.Bd1 Kb6 50.Bf3 Bc2 51.Bg4 Bb3 52.Bh3 Ba2 53.Bg2 Bb1 
54.Kc4 Ba2+ 55.Kc3 Bb1 56.Kd4 Bc2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Keres, Paul"]
[Black "Smyslov, Vassily"]
[WhiteElo "2615"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "B15"]
[EventDate "1971.07.13"]
[PlyCount "40"]

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ exf6 6.Bc4 Qe7+ 7.Qe2 Be6 8.
Bb3 Na6 9.c3 Nc7 10.Bf4 Bxb3 11.axb3 Nd5 12.Bg3 a6 13.Kd2 Qxe2+ 14.Nxe2 
O-O-O 15.Rhe1 Bd6 16.Bxd6 Rxd6 17.Ng3 Re6 18.Ne4 Nc7 19.Nc5 Rxe1 20.Rxe1 
Re8 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Portisch, Lajos"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2630"]
[BlackElo "2570"]
[Result "1-0"]
[ECO "A16"]
[EventDate "1971.07.13"]
[PlyCount "81"]

1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nb6 6.Nf3 Bg7 7.O-O Nc6 8.d3 
O-O 9.Bd2 h6 10.Rc1 Kh7 11.Qc2 Bg4 12.Qb1 e5 13.h3 Be6 14.Ne4 Bd5 15.e3 
Bxe4 16.dxe4 a5 17.Rfd1 Qf6 18.Ne1 Rfd8 19.Nd3 Bf8 20.a3 Rd7 21.Be1 Rad8 
22.Qc2 a4 23.Kh2 Qe6 24.Bf1 Qb3 25.Qb1 Kg8 26.Rc3 Qe6 27.Rdc1 Qf6 28.h4 
Na5 29.Rxc7 Rxc7 30.Rxc7 Nbc4 31.Bxa5 Nxa5 32.Qc2 b5 33.Nb4 Bxb4 34.axb4 
Nb3 35.Rc8 Rxc8 36.Qxc8+ Kg7 37.Qc2 Qd6 38.Bxb5 Qxb4 39.Qc4 Qd2 40.Kg2 Na5
41.Qc7 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.16"]
[Round "4"]
[White "Scholl, Eduard"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2430"]
[BlackElo "2600"]
[Result "1/2-1/2"]
[ECO "C93"]
[EventDate "1971.07.13"]
[PlyCount "69"]

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 Nc4 15.b3 Nb6 
16.a4 d5 17.Nxe5 dxe4 18.Bb2 c5 19.Nxe4 Nxe4 20.Bxe4 Bxe4 21.Rxe4 bxa4 22.
bxa4 f6 23.Nc6 Qd5 24.Rxe8 Rxe8 25.dxc5 Qxd1+ 26.Rxd1 Nxa4 27.Ba3 Rc8 28.
Nd4 Nxc3 29.Rc1 Nb5 30.Nxb5 axb5 31.Kf1 Kf7 32.Rb1 Rb8 33.Bb4 Ke6 34.c6 
Bxb4 35.c7 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Adorjan, Andras"]
[Black "Hartoch, Robert"]
[WhiteElo "2465"]
[BlackElo "2400"]
[Result "1/2-1/2"]
[ECO "B09"]
[EventDate "1971.07.13"]
[PlyCount "34"]

1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.f4 Nf6 5.e5 dxe5 6.dxe5 Qxd1+ 7.Kxd1 Nfd7 8.
Nd5 Kd8 9.Nf3 c6 10.Ne3 f6 11.exf6 Bxf6 12.Ng4 Nf8 13.Nxf6 exf6 14.Be3 Bf5
15.Rg1 Nbd7 16.g4 Be4 17.Nd2 Bd5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Donner, Jan"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2500"]
[BlackElo "2500"]
[Result "1/2-1/2"]
[ECO "A58"]
[EventDate "1971.07.13"]
[PlyCount "83"]

1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.Nf3 Qa5 8.Nd2 
Nbd7 9.g3 g6 10.e4 Bxf1 11.Kxf1 Bg7 12.Nc4 Qb4 13.Qe2 Nb6 14.Nxb6 Qxb6 15.
Kg2 O-O 16.Rb1 Rfb8 17.Bd2 Ne8 18.b3 Nc7 19.a4 Rb7 20.Rhc1 Rab8 21.Qd3 Qa7
22.Qc2 Qa6 23.Nd1 Qe2 24.Ne3 Na6 25.Re1 Qh5 26.Nc4 Rf8 27.Na5 Rc7 28.Qc4 
Nb8 29.b4 f5 30.f4 fxe4 31.Qxe4 cxb4 32.Rxb4 Na6 33.Rc4 Nc5 34.Qf3 Qxf3+ 
35.Kxf3 Rf5 36.Nb3 Rxd5 37.Be3 Rd3 38.Nxc5 Rxc5 39.Rxc5 dxc5 40.Ke4 Ra3 
41.Bxc5 Rxa4+ 42.Kf3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Gligoric, Svetozar"]
[Black "Portisch, Lajos"]
[WhiteElo "2600"]
[BlackElo "2630"]
[Result "1-0"]
[ECO "D80"]
[EventDate "1971.07.13"]
[PlyCount "82"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5 Ne4 5.Bh4 Nxc3 6.bxc3 dxc4 7.e3 Be6 8.Be2 
Bg7 9.Nf3 O-O 10.O-O c5 11.Ng5 Bd5 12.e4 Bc6 13.d5 Bb5 14.a4 Ba6 15.Qd2 e6
16.Nf3 Qd6 17.e5 Qxd5 18.Qe3 Nd7 19.Rfd1 Qc6 20.Be7 Rfe8 21.Bd6 f6 22.h4 
Rad8 23.h5 gxh5 24.Rd2 b6 25.Rad1 Bb7 26.Bxc4 Qxa4 27.exf6 Qxc4 28.Be7 
Bxf3 29.Qxf3 Bxf6 30.Bxd8 Rxd8 31.Rxd7 Rf8 32.Rxa7 Bh4 33.Ra8 Rxa8 34.
Qxa8+ Kf7 35.Rd7+ Be7 36.Qf3+ Ke8 37.Rb7 Qd5 38.Qxd5 exd5 39.Rxb6 Kf7 40.
Kf1 c4 41.Ke2 h4 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Langeweg, Christian"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2425"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "E99"]
[EventDate "1971.07.13"]
[PlyCount "82"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 Bg7 4.d4 d6 5.e4 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 
9.Ne1 Nd7 10.Nd3 f5 11.Bd2 Nf6 12.f3 f4 13.c5 g5 14.Rc1 h5 15.Nb5 Ne8 16.
Qc2 Bd7 17.Qb3 Kh8 18.Nf2 b6 19.cxb6 cxb6 20.a4 Rf6 21.Rc2 Rg6 22.Rfc1 Ng8
23.h3 Nh6 24.Nc7 Rc8 25.Nxe8 Rxc2 26.Rxc2 Bxe8 27.Bb5 Bxb5 28.axb5 Bf8 29.
Qc3 Kg8 30.Qc8 Qxc8 31.Rxc8 Rg7 32.Bb4 Rd7 33.Nd3 Nf7 34.Bc3 g4 35.hxg4 
hxg4 36.fxg4 Ng5 37.Nf2 Kf7 38.Kf1 a6 39.Rc6 axb5 40.Rxb6 Ra7 41.Rxb5 Ra1+
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Ree, Hans"]
[Black "Ivkov, Borislav"]
[WhiteElo "2430"]
[BlackElo "2560"]
[Result "1/2-1/2"]
[ECO "C15"]
[EventDate "1971.07.13"]
[PlyCount "81"]

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 dxe4 5.a3 Be7 6.Nxe4 Nf6 7.N2g3 Nbd7 8.Bd3
b6 9.O-O Bb7 10.Re1 O-O 11.Bf4 Nxe4 12.Nxe4 Nf6 13.Nxf6+ Bxf6 14.c3 Rc8 
15.Qc2 g6 16.Rad1 Qe7 17.Be4 Bxe4 18.Qxe4 c6 19.Be5 Rfd8 20.Rd3 Bxe5 21.
Qxe5 Rd5 22.Qe4 Rcd8 23.Red1 Qd7 24.c4 Rd6 25.h4 h5 26.g3 Qe7 27.Qe5 Qf8 
28.R1d2 R8d7 29.Kf1 Qd8 30.Kg1 Qf8 31.Kf1 Rd8 32.Kg1 Qg7 33.Qe4 Qf6 34.Kg2
Qe7 35.Kg1 b5 36.b3 bxc4 37.bxc4 Qb7 38.Qe5 Qa6 39.Qc5 Qb6 40.Qe5 Qa6 41.
Qc5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Smyslov, Vassily"]
[Black "Scholl, Eduard"]
[WhiteElo "2620"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "D78"]
[EventDate "1971.07.13"]
[PlyCount "107"]

1.Nf3 g6 2.d4 Nf6 3.c4 Bg7 4.g3 c6 5.Bg2 O-O 6.O-O d5 7.Nbd2 Bf5 8.b3 Ne4 
9.Bb2 Qa5 10.Qc1 Bh6 11.e3 Nd7 12.Nxe4 Bxe4 13.Bc3 Qd8 14.Rd1 Nf6 15.Qb2 
Re8 16.Rac1 Bf5 17.Qe2 Qd6 18.Ne5 Ne4 19.Bb2 Rac8 20.f3 Nf6 21.g4 Be6 22.
f4 Nd7 23.c5 Qc7 24.Rf1 f5 25.g5 Bg7 26.h4 Bf7 27.h5 Nxe5 28.dxe5 e6 29.
hxg6 Bxg6 30.Kf2 Kf7 31.Bd4 Rh8 32.Rh1 Rcg8 33.Bf3 Ke7 34.b4 Qd7 35.a4 a6 
36.Rb1 Ra8 37.Rb3 Rhc8 38.Qb2 Ra7 39.Be2 Kf7 40.Qc3 Bf8 41.Rhb1 Be7 42.Ke1
h6 43.gxh6 Rh8 44.Kd2 Rxh6 45.Qa1 Qe8 46.Rh1 Qh8 47.Rxh6 Qxh6 48.Rb1 Ra8 
49.Rh1 Qg7 50.Qb1 Rh8 51.b5 axb5 52.axb5 Rxh1 53.Qxh1 Qf8 54.Qc1 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Timman, Jan"]
[Black "Keres, Paul"]
[WhiteElo "2445"]
[BlackElo "2615"]
[Result "0-1"]
[ECO "E41"]
[EventDate "1971.07.13"]
[PlyCount "50"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Nf3 b6 6.Be2 Bb7 7.O-O O-O 8.Na4 Qe7 
9.a3 Ba5 10.dxc5 bxc5 11.Nxc5 Qxc5 12.b4 Qc7 13.bxa5 Ng4 14.g3 Nc6 15.Bd2 
Nxa5 16.Ng5 Nf6 17.Bb4 Rfc8 18.Bh5 Nxc4 19.Bxf7+ Kh8 20.Qd4 h6 21.f4 hxg5 
22.fxg5 Qc6 23.Ra2 Ne5 24.gxf6 Qh1+ 25.Kf2 Qg2+ 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.17"]
[Round "5"]
[White "Uhlmann, Wolfgang"]
[Black "Bobotsov, Milko"]
[WhiteElo "2570"]
[BlackElo "2485"]
[Result "1-0"]
[ECO "E11"]
[EventDate "1971.07.13"]
[PlyCount "123"]

1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nbd2 d5 5.Qa4+ Nc6 6.a3 Be7 7.e3 Bd7 8.Qc2 
a5 9.b3 g6 10.Bb2 O-O 11.Be2 Nh5 12.O-O f5 13.Rac1 Be8 14.Ne5 Nxe5 15.dxe5
c6 16.Rfd1 g5 17.cxd5 exd5 18.Nf3 Ng7 19.Nd4 Bg6 20.Bd3 Qe8 21.f4 Qf7 22.
g4 gxf4 23.e6 Nxe6 24.gxf5 Nxd4 25.fxg6 Nxc2 26.gxf7+ Rxf7 27.Rxc2 fxe3 
28.Bd4 Bxa3 29.Rg2+ Kf8 30.Bxe3 Ke7 31.Rf1 Raf8 32.Rxf7+ Rxf7 33.Ra2 Bb4 
34.Bb6 Kd6 35.Bxa5 Bxa5 36.Rxa5 Ke5 37.b4 Kd4 38.Bf1 h6 39.Ra3 Rf6 40.Rd3+
Ke4 41.Rg3 b6 42.Bg2+ Kd4 43.Rg4+ Ke5 44.Rh4 Kd6 45.Rh5 b5 46.h3 Kc7 47.
Kh2 Rf4 48.Rxh6 Rxb4 49.h4 Rd4 50.Kg3 b4 51.Rh7+ Kb6 52.Re7 b3 53.h5 Rb4 
54.Re1 Kc5 55.Bh3 Kd4 56.h6 Rb8 57.Bf5 c5 58.h7 Rh8 59.Bg6 b2 60.Re2 c4 
61.Rxb2 Kc3 62.Rb5 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Adorjan, Andras"]
[Black "Langeweg, Christian"]
[WhiteElo "2465"]
[BlackElo "2425"]
[Result "1/2-1/2"]
[ECO "B44"]
[EventDate "1971.07.13"]
[PlyCount "24"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.Bf4 e5 7.Be3 a6 8.N5c3 
Nf6 9.Bg5 Be7 10.Bxf6 Bxf6 11.Nd5 Bg5 12.Na3 Be6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Bobotsov, Milko"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2485"]
[BlackElo "2600"]
[Result "1/2-1/2"]
[ECO "E88"]
[EventDate "1971.07.13"]
[PlyCount "83"]

1.c4 g6 2.d4 Nf6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.d5 c6 8.Bd3 Nbd7 9.
Nge2 Nc5 10.Bc2 cxd5 11.cxd5 a5 12.O-O Bd7 13.a3 Nh5 14.b4 axb4 15.axb4 
Na6 16.Rb1 Nf4 17.Qd2 Rc8 18.Rfc1 Rc4 19.Na2 f5 20.exf5 Bxf5 21.Bxf5 Nxe2+
22.Qxe2 Rxc1+ 23.Rxc1 gxf5 24.Qb5 Qe7 25.Qb6 f4 26.Bf2 e4 27.fxe4 f3 28.
Qe3 fxg2 29.Kxg2 Qf6 30.Rc2 Qg6+ 31.Bg3 h5 32.h4 Bh6 33.Qd3 Rf4 34.Rc8+ 
Kh7 35.Nc3 Rxh4 36.Kf2 Rg4 37.Qf3 Bg7 38.Ne2 Nxb4 39.Nf4 Qf7 40.Rc4 Be5 
41.Ke3 Na6 42.Ne2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Browne, Walter Shawn"]
[Black "Ree, Hans"]
[WhiteElo "2500"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "C92"]
[EventDate "1971.07.13"]
[PlyCount "85"]

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 Be6 10.d4 Bxb3 11.axb3 exd4 12.cxd4 Nb4 13.d5 c5 14.dxc6 d5 15.e5 Ne4
16.Nc3 Nxc3 17.bxc3 Nxc6 18.Qd3 Qd7 19.Ng5 Bxg5 20.Bxg5 Rfe8 21.f4 b4 22.
c4 d4 23.Qf3 a5 24.Rad1 a4 25.Qd5 Qe6 26.bxa4 Rxa4 27.Qf3 Ra3 28.Qd5 Rc3 
29.f5 Qxd5 30.cxd5 Nxe5 31.d6 f6 32.d7 Rd8 33.Rxe5 Rxd7 34.Rb5 fxg5 35.
Rxb4 d3 36.Rg4 h6 37.Rg3 Kf7 38.Re3 h5 39.g4 hxg4 40.hxg4 Rd4 41.Kh1 Rb3 
42.Rd2 Ra3 43.Kh2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Evans, Larry Melvyn"]
[Black "Donner, Jan"]
[WhiteElo "2550"]
[BlackElo "2500"]
[Result "0-1"]
[ECO "B10"]
[EventDate "1971.07.13"]
[PlyCount "130"]

1.e4 c6 2.d3 d5 3.Nd2 g6 4.g3 Bg7 5.Bg2 e5 6.Ngf3 Ne7 7.O-O O-O 8.c3 Nd7 
9.Qc2 h6 10.a4 a5 11.b3 b6 12.Ba3 Ba6 13.Rfe1 Re8 14.Rad1 c5 15.exd5 Nxd5 
16.Nc4 Nxc3 17.Qxc3 e4 18.d4 exf3 19.Rxe8+ Qxe8 20.Qxf3 Rb8 21.Nd6 Qe6 22.
dxc5 Be2 23.Qd5 Bxd1 24.Qxd1 Nxc5 25.Bd5 Qf6 26.Nxf7 Kh7 27.Bxc5 bxc5 28.
Qg4 Rb4 29.Qc8 Rd4 30.Qe6 Qxe6 31.Bxe6 Rd1+ 32.Kg2 Rd2 33.h4 Bd4 34.Bc4 
Bxf2 35.Kf3 Bd4 36.Nd6 Rf2+ 37.Ke4 Bc3 38.Kd5 Rf3 39.Ne4 Bb4 40.g4 Rh3 41.
Nxc5 Rxh4 42.Nd3 Bd2 43.Ne5 Bc3 44.Be2 Kg7 45.Nc6 Rh2 46.Bf3 Rf2 47.Ke4 
Rb2 48.Bd1 Rd2 49.Bf3 Kf6 50.Na7 Rd4+ 51.Ke3 Rb4 52.Nb5 Be5 53.Bd1 Kg5 54.
Na3 Rd4 55.Bf3 Rd8 56.Nc4 Bc3 57.Kf2 Kf4 58.Be2 Ke4 59.Kg2 Bb4 60.Bf3+ Kd4
61.Bc6 g5 62.Bb5 Kc3 63.Kf3 Rd4 64.Ne3 Kxb3 65.Kg3 Bd6+ 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Hartoch, Robert"]
[Black "Keres, Paul"]
[WhiteElo "2400"]
[BlackElo "2615"]
[Result "1-0"]
[ECO "A57"]
[EventDate "1971.07.13"]
[PlyCount "107"]

1.d4 Nf6 2.Nf3 c5 3.d5 b5 4.c4 Bb7 5.e3 g6 6.Nc3 b4 7.Ne2 Bg7 8.Ng3 e6 9.
e4 exd5 10.exd5 O-O 11.Be2 d6 12.O-O Nbd7 13.Bf4 Nb6 14.Qd2 Re8 15.Bd3 Ba6
16.Rac1 Rc8 17.b3 Rc7 18.h3 Qe7 19.Rfe1 Qf8 20.Rxe8 Nxe8 21.Ne2 Bc8 22.Nh2
Nd7 23.Be3 a5 24.g4 a4 25.f4 Ra7 26.Nf3 Qe7 27.Kg2 axb3 28.axb3 Ra3 29.Bc2
Ra2 30.Bf2 Nb6 31.Re1 Qd8 32.Bh4 Qd7 33.Qd3 Nf6 34.Ng3 h5 35.f5 hxg4 36.
hxg4 Nxg4 37.fxg6 f6 38.Kg1 Ne5 39.Nxe5 dxe5 40.Qf5 Qe8 41.Qh5 Bh3 42.Bxf6
Bxf6 43.Qxh3 Qe7 44.Bf5 Kf8 45.Rf1 Ke8 46.Ne4 Bg7 47.Qh7 Bf8 48.d6 Qg7 49.
d7+ Kd8 50.Qxg7 Bxg7 51.Nxc5 Nxd7 52.Rd1 Ra7 53.Rxd7+ Rxd7 54.Nxd7 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Ivkov, Borislav"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2560"]
[BlackElo "2570"]
[Result "1/2-1/2"]
[ECO "A12"]
[EventDate "1971.07.13"]
[PlyCount "30"]

1.c4 Nf6 2.g3 c6 3.Nf3 d5 4.b3 Bg4 5.Bg2 g6 6.Bb2 Bg7 7.d3 Bxf3 8.Bxf3 O-O
9.O-O Nbd7 10.Nd2 e6 11.Qc2 Qe7 12.a3 Rfc8 13.Rac1 Ne8 14.Bxg7 Kxg7 15.
Qb2+ Qf6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Portisch, Lajos"]
[Black "Smyslov, Vassily"]
[WhiteElo "2630"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "E56"]
[EventDate "1971.07.13"]
[PlyCount "98"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 c5 6.Nf3 d5 7.O-O dxc4 8.Bxc4 
Nc6 9.a3 Ba5 10.Qd3 a6 11.Rd1 b5 12.Ba2 Bb6 13.h3 c4 14.Qc2 Qc7 15.e4 e5 
16.Be3 exd4 17.Nxd4 Nxd4 18.Bxd4 Bxd4 19.Rxd4 Be6 20.Rad1 Rad8 21.Qd2 Rxd4
22.Qxd4 Nd7 23.Bb1 Rb8 24.Ne2 Qb6 25.f4 f6 26.Qxb6 Nxb6 27.Rd6 Kf7 28.Nd4 
Bd7 29.e5 fxe5 30.fxe5 g6 31.Be4 Be8 32.Kf2 a5 33.Kf3 b4 34.axb4 axb4 35.
Kf4 b3 36.Nc6 Bxc6 37.Rxc6 Ke7 38.Rc7+ Ke6 39.Rc6+ Ke7 40.Ke3 Na4 41.Kd4 
Rd8+ 42.Kxc4 Nxb2+ 43.Kc3 Nd1+ 44.Kxb3 Nf2 45.Bc2 Nd3 46.Rc7+ Ke6 47.Rxh7 
Kxe5 48.g3 Kf6 49.Kc3 Ne5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.19"]
[Round "6"]
[White "Scholl, Eduard"]
[Black "Timman, Jan"]
[WhiteElo "2430"]
[BlackElo "2445"]
[Result "0-1"]
[ECO "C49"]
[EventDate "1971.07.13"]
[PlyCount "86"]

1.e4 Nf6 2.Nc3 e5 3.Nf3 Nc6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 
Qe7 9.Re1 Nd8 10.d4 Ne6 11.Bc1 c5 12.Bf1 Qc7 13.g3 Kh8 14.h3 Bd7 15.d5 Nd8
16.Nh4 Qa5 17.Bg5 Ng8 18.Bd2 Qa4 19.f4 f6 20.f5 Be8 21.Be2 g5 22.fxg6 hxg6
23.Rb1 Kg7 24.Bg4 Ne7 25.Rb2 b6 26.Qf3 Nb7 27.Rf1 Bd7 28.Rf2 Na5 29.Qe2 
Rh8 30.Rb1 Raf8 31.Rbf1 Bb5 32.Qe1 Bxf1 33.Kxf1 Qxa2 34.Kg2 Nc4 35.Bc1 a5 
36.Be6 g5 37.Qe2 Qb1 38.Rf1 Qa2 39.Rf2 Qa1 40.Qxc4 Qxc1 41.Nf3 f5 42.Qa2 
Rxh3 43.Nh4 Qh1# 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Donner, Jan"]
[Black "Adorjan, Andras"]
[WhiteElo "2500"]
[BlackElo "2465"]
[Result "1/2-1/2"]
[ECO "D87"]
[EventDate "1971.07.13"]
[PlyCount "26"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 
Nc6 9.Be3 O-O 10.O-O Qc7 11.Qc1 b6 12.dxc5 Ne5 13.Bd5 Bb7 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Gligoric, Svetozar"]
[Black "Ivkov, Borislav"]
[WhiteElo "2600"]
[BlackElo "2560"]
[Result "1/2-1/2"]
[ECO "E42"]
[EventDate "1971.07.13"]
[PlyCount "30"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2 d6 6.a3 Ba5 7.g3 Ne4 8.Qc2 Nxc3 
9.Nxc3 cxd4 10.exd4 Nc6 11.Be3 e5 12.dxe5 Nxe5 13.Bg2 O-O 14.O-O Nxc4 15.
Bd4 Be6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Keres, Paul"]
[Black "Scholl, Eduard"]
[WhiteElo "2615"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "C94"]
[EventDate "1971.07.13"]
[PlyCount "120"]

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.d3 c5 11.a4 Bb7 12.axb5 axb5 13.Rxa8 Bxa8 14.Na3 Qb6 15.Ba2 
Bc6 16.Nc2 Qa7 17.Bb1 Re8 18.Ne3 Bf8 19.Nf5 Nbd7 20.Nh2 d5 21.Ng4 dxe4 22.
dxe4 Nxg4 23.Qxg4 Kh8 24.Bc2 Qa8 25.Qf3 Nb6 26.Kh2 Rd8 27.b3 Rd7 28.Ne3 
Qd8 29.Bb2 f6 30.Ra1 h6 31.Qf5 Rd6 32.Nd5 Bd7 33.Qf3 Be6 34.Bc1 Nxd5 35.
exd5 Bxd5 36.Qf5 Bg8 37.Be4 Qe7 38.Ra8 Rd8 39.Bxh6 Rxa8 40.Be3 Qf7 41.Bxa8
Qxb3 42.Qh5+ Bh7 43.Qe8 Qg8 44.Qxb5 Bd6 45.Bc6 Qf8 46.Qe2 f5 47.Kg1 Bg6 
48.Bd5 e4 49.g3 Bf7 50.Qc4 Bh5 51.g4 fxg4 52.hxg4 Qf3 53.Qxe4 Qxg4+ 54.
Qxg4 Bxg4 55.Kf1 Be5 56.c4 Bd6 57.Ke1 Kh7 58.Be4+ Kg8 59.Kd2 Kf7 60.Kd3 
Kf6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Langeweg, Christian"]
[Black "Hartoch, Robert"]
[WhiteElo "2425"]
[BlackElo "2400"]
[Result "1-0"]
[ECO "A16"]
[EventDate "1971.07.13"]
[PlyCount "117"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Qb3 Nb6 6.g3 Bg7 7.Bg2 O-O 8.O-O 
Nc6 9.d3 e5 10.Bg5 Qe8 11.Nb5 Qd7 12.Rac1 a6 13.Nc3 Qe8 14.Ne4 Be6 15.Qa3 
f6 16.Bd2 Rf7 17.Nc5 Bf8 18.b4 a5 19.b5 Na7 20.Qc3 Nxb5 21.Qa1 Bxc5 22.
Rxc5 Na4 23.Rcc1 c6 24.Be3 Nc7 25.Bh6 Qe7 26.Nd2 Bd5 27.e4 Be6 28.f4 exf4 
29.Bxf4 Nb5 30.d4 Rd8 31.Nb3 Nb6 32.Rfd1 g5 33.Be3 Nc4 34.Bf2 Nbd6 35.Re1 
Rc8 36.Bf1 b5 37.a4 bxa4 38.Qxa4 Nb2 39.Qa3 Bxb3 40.Qxb3 Qb7 41.Qe6 Rd8 
42.Rb1 a4 43.e5 a3 44.exd6 Qb4 45.Rxb2 axb2 46.Bc4 Rf8 47.Ba2 Kg7 48.d7 
Qa5 49.Rb1 Qc7 50.Rxb2 Rxd7 51.Re2 Ra8 52.Qe4 Kf8 53.Qf5 Qd8 54.Qc5+ Kg7 
55.Qxc6 Rc8 56.Qe4 Rc1+ 57.Kg2 Kf8 58.Be6 Rdc7 59.h4 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Ree, Hans"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2430"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "A79"]
[EventDate "1971.07.13"]
[PlyCount "77"]

1.d4 Nf6 2.c4 e6 3.Nc3 c5 4.d5 exd5 5.cxd5 d6 6.Nf3 g6 7.e4 Bg7 8.Be2 O-O 
9.O-O Re8 10.Nd2 Na6 11.f3 Nc7 12.a4 b6 13.Nc4 Ba6 14.Bg5 h6 15.Be3 Bxc4 
16.Bxc4 a6 17.Qd2 Kh7 18.Rab1 Qd7 19.b4 b5 20.Be2 c4 21.a5 Ng8 22.Bd4 
Bxd4+ 23.Qxd4 f5 24.Bd1 Qg7 25.Qd2 fxe4 26.Nxe4 Re5 27.Nc3 Rae8 28.Bc2 Kh8
29.Be4 Nf6 30.Rbd1 g5 31.g4 R5e7 32.Rf2 Rf8 33.Rdf1 Nxe4 34.fxe4 Rxf2 35.
Rxf2 Ne8 36.h3 Kg8 37.Qe3 Nf6 38.Qb6 Ne8 39.Qe3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Smyslov, Vassily"]
[Black "Bobotsov, Milko"]
[WhiteElo "2620"]
[BlackElo "2485"]
[Result "1/2-1/2"]
[ECO "A37"]
[EventDate "1971.07.13"]
[PlyCount "35"]

1.c4 g6 2.Nc3 c5 3.Nf3 Bg7 4.g3 Nc6 5.Bg2 e6 6.d3 Nge7 7.Bd2 d5 8.O-O O-O 
9.Qc1 b6 10.cxd5 Nxd5 11.Bh6 Bb7 12.Bxg7 Kxg7 13.Qd2 Nd4 14.Nxd4 cxd4 15.
Nb5 e5 16.Rfc1 Qd7 17.a4 Rfc8 18.e4 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Timman, Jan"]
[Black "Portisch, Lajos"]
[WhiteElo "2445"]
[BlackElo "2630"]
[Result "1/2-1/2"]
[ECO "A15"]
[EventDate "1971.07.13"]
[PlyCount "98"]

1.Nf3 Nf6 2.c4 b6 3.g3 Bb7 4.Bg2 g6 5.Nc3 Bg7 6.d4 Ne4 7.Bd2 d6 8.Qc2 Nxd2
9.Qxd2 c5 10.d5 Na6 11.h4 h6 12.O-O Nc7 13.e4 Bc8 14.Rae1 e5 15.h5 gxh5 
16.Nh4 Bf6 17.Nf5 Bxf5 18.exf5 Kf8 19.Ne4 h4 20.Qc3 Ne8 21.f4 Rg8 22.Nxf6 
Qxf6 23.fxe5 dxe5 24.Rxe5 Nd6 25.gxh4 Rg4 26.Rfe1 Kg7 27.Re7 Qxc3 28.bxc3 
Kf6 29.Kh2 Rxh4+ 30.Bh3 Rd8 31.Rxa7 Nxc4 32.Kg3 Rh5 33.Bg4 Rg8 34.Rb7 Rhg5
35.Re4 h5 36.Rxc4 Rxg4+ 37.Rxg4 hxg4 38.Kf4 g3 39.Rxb6+ Ke7 40.Rb1 g2 41.
Rg1 Kf6 42.c4 Rg5 43.a4 Rxf5+ 44.Ke3 Rf1 45.Rxg2 Ra1 46.Rg8 Rxa4 47.Kd3 
Ra3+ 48.Kc2 Ke5 49.Kb2 Ra7 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.20"]
[Round "7"]
[White "Uhlmann, Wolfgang"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2570"]
[BlackElo "2500"]
[Result "1/2-1/2"]
[ECO "B36"]
[EventDate "1971.07.13"]
[PlyCount "98"]

1.c4 c5 2.Nf3 g6 3.d4 cxd4 4.Nxd4 Nc6 5.e4 Nf6 6.Nc3 d6 7.Be2 Nxd4 8.Qxd4 
Bg7 9.O-O O-O 10.Qe3 Be6 11.Bd2 a6 12.b3 Nd7 13.f4 Qb6 14.Qxb6 Nxb6 15.
Rac1 Bd4+ 16.Kh1 Bd7 17.Bf3 Bc6 18.Rcd1 Nd7 19.Be1 Bxc3 20.Bxc3 Nc5 21.e5 
Bxf3 22.gxf3 dxe5 23.fxe5 Rfc8 24.Bb4 b6 25.Rd5 a5 26.Bd2 Rc6 27.Rd1 Kf8 
28.Be3 Ke8 29.f4 Rac8 30.Kg2 f6 31.exf6 exf6 32.Bxc5 bxc5 33.Re1+ Kf8 34.
Rd7 R6c7 35.Ree7 Rxd7 36.Rxd7 a4 37.Rxh7 Kg8 38.Rb7 Rd8 39.bxa4 Ra8 40.Rc7
Rxa4 41.Rxc5 Rxa2+ 42.Kg3 Kf7 43.Rc6 Ra3+ 44.Kh4 Ra2 45.h3 Rg2 46.c5 Ke7 
47.Ra6 g5+ 48.fxg5 fxg5+ 49.Kh5 Rg3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Adorjan, Andras"]
[Black "Ree, Hans"]
[WhiteElo "2465"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "B80"]
[EventDate "1971.07.13"]
[PlyCount "24"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.g3 Be7 7.Bg2 O-O 8.O-O a6
9.Be3 Qc7 10.g4 Nc6 11.g5 Nd7 12.Qh5 g6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Bobotsov, Milko"]
[Black "Timman, Jan"]
[WhiteElo "2485"]
[BlackElo "2445"]
[Result "0-1"]
[ECO "E81"]
[EventDate "1971.07.13"]
[PlyCount "64"]

1.c4 Nf6 2.Nc3 g6 3.e4 d6 4.d4 Bg7 5.f3 O-O 6.Be3 a6 7.Bd3 c5 8.dxc5 dxc5 
9.Bxc5 Nc6 10.Be3 Nd7 11.Rc1 Qa5 12.Ne2 Nc5 13.O-O Rd8 14.Nd5 e6 15.Bd2 
Qxa2 16.Bb1 Qxb2 17.Rc2 Qb3 18.Nc1 Qxb1 19.Bg5 exd5 20.Bxd8 Nxd8 21.cxd5 
Qb6 22.Kh1 Bd7 23.Qd2 Ba4 24.Ra2 Bb5 25.Re1 Rc8 26.e5 Nd7 27.f4 Rc4 28.Ne2
Nc5 29.Nd4 Nd3 30.Nxb5 Nxe1 31.Nd6 Qb1 32.Rb2 Nf3+ 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Browne, Walter Shawn"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2500"]
[BlackElo "2600"]
[Result "1-0"]
[ECO "C93"]
[EventDate "1971.07.13"]
[PlyCount "105"]

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 Nc4 15.b3 Nb6 
16.Bb2 Nbd7 17.a4 c5 18.d5 g6 19.Bd3 Qb6 20.Qe2 c4 21.bxc4 bxa4 22.Ba3 Qc7
23.Reb1 Bc8 24.Qe3 Nc5 25.Bxc5 dxc5 26.Bc2 Bd7 27.Bxa4 Reb8 28.Qc1 Rxb1 
29.Qxb1 Bxa4 30.Rxa4 Nd7 31.Nd2 Be7 32.Qa2 a5 33.Nb3 Bd8 34.Ne2 Ra6 35.
Nec1 Qa7 36.Nd3 Kg7 37.Qa3 Bb6 38.Qc1 Bc7 39.Qa3 Bb6 40.Qa2 Bc7 41.g3 f5 
42.Qe2 Rf6 43.h4 Qb6 44.Nd2 Rf8 45.h5 gxh5 46.exf5 Rxf5 47.Ne4 Kh7 48.Kg2 
Bd8 49.Ra2 Be7 50.Rb2 Qa7 51.Qc2 Kg6 52.Qa4 Kg7 53.Qc6 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Evans, Larry Melvyn"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2550"]
[BlackElo "2570"]
[Result "1-0"]
[ECO "E81"]
[EventDate "1971.07.13"]
[PlyCount "75"]

1.c4 g6 2.Nc3 Bg7 3.d4 Nf6 4.e4 d6 5.f3 O-O 6.Nge2 e5 7.Bg5 c6 8.Qd2 a6 9.
d5 cxd5 10.Nxd5 Be6 11.Nec3 Nc6 12.Bd3 Nd4 13.O-O Bxd5 14.cxd5 b5 15.Kh1 
Rc8 16.Ne2 Nxe2 17.Bxe2 h6 18.Be3 Nh5 19.a4 Nf4 20.axb5 Nxe2 21.Qxe2 axb5 
22.Qxb5 Rb8 23.Qe2 Rb3 24.Ra3 Qb8 25.Rxb3 Qxb3 26.Rc1 f5 27.h3 Rb8 28.Rc2 
fxe4 29.fxe4 Kh7 30.Bc1 Rb4 31.Rc7 Rb8 32.Kh2 Rf8 33.Qg4 Qb6 34.Qd7 Rg8 
35.Qe7 g5 36.Bxg5 hxg5 37.Qf7 Kh6 38.Re7 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Hartoch, Robert"]
[Black "Scholl, Eduard"]
[WhiteElo "2400"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "A36"]
[EventDate "1971.07.13"]
[PlyCount "53"]

1.c4 c5 2.Nf3 Nf6 3.Nc3 e6 4.g3 Nc6 5.Bg2 d5 6.cxd5 Nxd5 7.O-O Nc7 8.d3 
Be7 9.Be3 O-O 10.d4 Na6 11.Rc1 Bd7 12.a3 c4 13.Bf4 Na5 14.e4 b5 15.d5 exd5
16.Nxd5 Bc5 17.b4 cxb3 18.Rxc5 Nxc5 19.Bc7 Qe8 20.Bxa5 Na6 21.Qxb3 Rc8 22.
Nd4 Rc4 23.Nf5 Bxf5 24.exf5 Nc5 25.Qf3 f6 26.Ne3 Re4 27.Bb4 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Ivkov, Borislav"]
[Black "Smyslov, Vassily"]
[WhiteElo "2560"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "C93"]
[EventDate "1971.07.13"]
[PlyCount "137"]

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 h6 10.d4 Re8 11.Be3 Bf8 12.Nbd2 Bd7 13.Qb1 Rb8 14.a3 Qc8 15.Ba2 Nd8 
16.b4 Nh5 17.Qd3 c6 18.Rac1 Rb7 19.c4 Qb8 20.Nb3 bxc4 21.Qxc4 exd4 22.
Nfxd4 Rxe4 23.Na5 d5 24.Qxa6 Rc7 25.Bb1 Re8 26.Naxc6 Nxc6 27.Nxc6 Rxc6 28.
Rxc6 Bxc6 29.Qxc6 Nf6 30.Rd1 Re6 31.Qc3 g6 32.Qd2 Qe8 33.Ba2 Qa4 34.Qd3 
Bxb4 35.axb4 Qxa2 36.b5 Kh7 37.Bd4 Ne4 38.Ra1 Qc4 39.Qxc4 dxc4 40.b6 Nd6 
41.Ra7 Re1+ 42.Kh2 Rb1 43.g4 g5 44.Rd7 c3 45.Rc7 h5 46.gxh5 Ne4 47.Rxf7+ 
Kh6 48.Rc7 Kxh5 49.Rc6 Rb4 50.Bg7 g4 51.hxg4+ Kxg4 52.Kg2 Kf5 53.f3 Rb2+ 
54.Kh3 Nf2+ 55.Kh4 Nd1 56.b7 Kf4 57.Rf6+ Ke3 58.Rf7 Rb4+ 59.Kg3 c2 60.Bh6+
Kd3 61.Rd7+ Kc4 62.Rc7+ Kd3 63.Rd7+ Kc4 64.Bc1 Nc3 65.Kf2 Rb5 66.Ke3 Re5+ 
67.Kf2 Rb5 68.Ke3 Re5+ 69.Kf2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Langeweg, Christian"]
[Black "Donner, Jan"]
[WhiteElo "2425"]
[BlackElo "2500"]
[Result "0-1"]
[ECO "E99"]
[EventDate "1971.07.13"]
[PlyCount "94"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 Bg7 4.d4 O-O 5.e4 d6 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 
9.Ne1 Nd7 10.Nd3 f5 11.Bd2 Nf6 12.f3 f4 13.c5 g5 14.Rc1 Ng6 15.Nb5 Rf7 16.
cxd6 cxd6 17.Qc2 Ne8 18.a4 h5 19.Nf2 Bf8 20.h3 Rg7 21.Qb3 Nh4 22.Rc2 Nf6 
23.Rfc1 g4 24.fxg4 hxg4 25.hxg4 Bxg4 26.Bxg4 Nxg4 27.Nxg4 Rxg4 28.Be1 f3 
29.Bxh4 Qxh4 30.Qxf3 Rxe4 31.g3 Qg4 32.Qxg4+ Rxg4 33.Rc4 Rxg3+ 34.Kf2 Rb3 
35.Rg4+ Kf7 36.Rc7+ Kf6 37.Rg8 e4 38.Nc3 Rxb2+ 39.Ke1 Re8 40.Nd1 Rb3 41.
Ke2 Ke5 42.Nc3 a6 43.Rc4 Kf5 44.Kd1 b5 45.axb5 axb5 46.Rxe4 Rc8 47.Rgg4 
Bh6 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.21"]
[Round "8"]
[White "Portisch, Lajos"]
[Black "Keres, Paul"]
[WhiteElo "2630"]
[BlackElo "2615"]
[Result "1/2-1/2"]
[ECO "E15"]
[EventDate "1971.07.13"]
[PlyCount "26"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Nbd2 Bb4 6.Qa4 c5 7.a3 Bxd2+ 8.Bxd2 
Bb7 9.Bg2 O-O 10.O-O cxd4 11.Nxd4 Bxg2 12.Kxg2 Nc6 13.Nxc6 dxc6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Donner, Jan"]
[Black "Hartoch, Robert"]
[WhiteElo "2500"]
[BlackElo "2400"]
[Result "1/2-1/2"]
[ECO "A79"]
[EventDate "1971.07.13"]
[PlyCount "81"]

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.Nd2 Na6 11.f3 Nc7 12.a4 b6 13.Nc4 Ba6 14.Bg5 h6 15.Be3 Bxc4 
16.Bxc4 a6 17.Qd2 Kh7 18.Rae1 Rb8 19.Bd3 b5 20.axb5 axb5 21.b4 c4 22.Bb1 
Ra8 23.Bd4 Ra3 24.f4 Qd7 25.Rf3 Rb3 26.Bc2 Rxb4 27.Rd1 Rb2 28.e5 Rxc2 29.
Qxc2 Nfxd5 30.Ne4 dxe5 31.fxe5 Ne6 32.Qf2 Re7 33.Bc3 Qb7 34.Nf6+ Bxf6 35.
exf6 Rd7 36.Bd2 g5 37.Re1 Ndf4 38.h4 Qd5 39.Bxf4 gxf4 40.Qc2+ Kh8 41.Rxf4 
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Gligoric, Svetozar"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2600"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "E97"]
[EventDate "1971.07.13"]
[PlyCount "113"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 
9.b4 Ne8 10.c5 Kh8 11.a4 f5 12.Ng5 h6 13.Ne6 Bxe6 14.dxe6 fxe4 15.cxd6 
Nxd6 16.b5 Qc8 17.Nd5 Re8 18.Bg4 Ndf5 19.Ba3 Nxd5 20.Qxd5 c6 21.Qxe4 Qxe6 
22.bxc6 Qxc6 23.Bxf5 gxf5 24.Qxf5 Qxa4 25.Qf7 b6 26.Bb2 Qb5 27.Bc1 Rf8 28.
Qh5 Qe8 29.Qh3 Qg6 30.Ra3 Rf6 31.Rg3 Qf5 32.Qh4 Raf8 33.Qa4 R8f7 34.Be3 
Qd7 35.Qe4 Rc6 36.h3 b5 37.Qb1 a6 38.Rd1 Rd6 39.Rxd6 Qxd6 40.Qe4 Qe6 41.
Rg6 Rf6 42.Rg4 Qf5 43.Qa8+ Kh7 44.Kh2 Rg6 45.Re4 Qd7 46.f3 Qd3 47.Bf2 Qc2 
48.Bg3 Qc6 49.Qa7 Qb6 50.Qd7 Qd6 51.Qb7 Kg8 52.Qa8+ Qf8 53.Qd5+ Qf7 54.
Qd8+ Kh7 55.Qd3 Qf5 56.Qe2 Re6 57.f4 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Keres, Paul"]
[Black "Bobotsov, Milko"]
[WhiteElo "2615"]
[BlackElo "2485"]
[Result "1-0"]
[ECO "A79"]
[EventDate "1971.07.13"]
[PlyCount "81"]

1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 O-O 
9.O-O Re8 10.Nd2 Na6 11.f3 Nc7 12.a4 b6 13.Nc4 Ba6 14.Bg5 Qd7 15.Qd2 Bxc4 
16.Bxc4 a6 17.Rfe1 b5 18.Bf1 bxa4 19.Rxa4 Rab8 20.Rea1 Rb6 21.Bxa6 Reb8 
22.R1a2 Nxa6 23.Rxa6 Rxa6 24.Rxa6 Ne8 25.h3 Qb7 26.Ra2 Qb6 27.Kh2 Nf6 28.
Bh6 Bh8 29.Nd1 Nd7 30.Ne3 Qb3 31.Ra7 Ne5 32.Ra3 Qb5 33.b3 c4 34.bxc4 Nxc4 
35.Nxc4 Qxc4 36.Bf4 Qc5 37.Ra6 Bc3 38.Qd3 Be5 39.Bxe5 dxe5 40.Rc6 Qf2 41.
Qc3 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Ree, Hans"]
[Black "Langeweg, Christian"]
[WhiteElo "2430"]
[BlackElo "2425"]
[Result "1-0"]
[ECO "E32"]
[EventDate "1971.07.13"]
[PlyCount "69"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 O-O 5.a3 Bxc3+ 6.Qxc3 b6 7.Bg5 Bb7 8.e3 
d6 9.f3 Nbd7 10.Bd3 c5 11.Ne2 Rc8 12.O-O h6 13.Bh4 d5 14.cxd5 cxd4 15.Qxd4
e5 16.Bxf6 Qxf6 17.Qg4 Nc5 18.Be4 Ba6 19.Rf2 Qd6 20.Nc3 Nd3 21.Bxd3 Bxd3 
22.Qb4 Qxb4 23.axb4 a6 24.Rd2 Bc4 25.e4 Rfd8 26.Na4 Rb8 27.Rc2 Bb5 28.b3 
Kf8 29.Rc7 Rd7 30.Rxd7 Bxd7 31.Nb2 Bb5 32.Rc1 Rb7 33.Rc8+ Ke7 34.Nc4 f6 
35.Kf2 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Scholl, Eduard"]
[Black "Portisch, Lajos"]
[WhiteElo "2430"]
[BlackElo "2630"]
[Result "0-1"]
[ECO "B92"]
[EventDate "1971.07.13"]
[PlyCount "27"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.O-O 
Be6 9.f4 Qc7 10.Qd3 b5 11.Qg3 Nbd7 12.Kh1 Bc4 13.Bxc4 Qxc4 14.fxe5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Smyslov, Vassily"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2620"]
[BlackElo "2500"]
[Result "1/2-1/2"]
[ECO "B36"]
[EventDate "1971.07.13"]
[PlyCount "83"]

1.c4 c5 2.Nf3 g6 3.d4 cxd4 4.Nxd4 Nc6 5.e4 Nf6 6.Nc3 d6 7.Be2 Nxd4 8.Qxd4 
Bg7 9.O-O O-O 10.Qe3 Bd7 11.Rd1 Qa5 12.Bd2 Rfc8 13.Nb5 Qb6 14.Qxb6 axb6 
15.Nc3 Be6 16.b3 b5 17.e5 Nd7 18.Nxb5 Nxe5 19.Bc3 Bg4 20.Bxg4 Nxg4 21.Bxg7
Kxg7 22.a4 Nf6 23.Rd3 Kf8 24.Re1 Ra6 25.h3 h5 26.f3 Rcc6 27.Red1 Ke8 28.
Kf2 Kd7 29.g4 Ra8 30.Re1 Rd8 31.Nc3 e6 32.Rd4 hxg4 33.hxg4 Rh8 34.Kg3 Ke7 
35.a5 Ra8 36.Nd5+ Nxd5 37.cxd5 Rc3 38.Rb4 Rxa5 39.Rxb7+ Kf6 40.dxe6 fxe6 
41.Re4 e5 42.g5+ 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Timman, Jan"]
[Black "Ivkov, Borislav"]
[WhiteElo "2445"]
[BlackElo "2560"]
[Result "1-0"]
[ECO "C16"]
[EventDate "1971.07.13"]
[PlyCount "107"]

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 Ne7 5.a3 Bxc3+ 6.bxc3 b6 7.Qg4 Ng6 8.h4 h5 
9.Qd1 Ba6 10.Bxa6 Nxa6 11.Bg5 Qd7 12.Ne2 Qc6 13.O-O Ne7 14.Qd3 Qc4 15.Qf3 
Nf5 16.Ng3 g6 17.Bf6 Rh7 18.a4 Nb8 19.Nxf5 gxf5 20.Qg3 Kf8 21.Rad1 Nc6 22.
Qg5 Qe2 23.Rd3 Qg4 24.Qd2 f4 25.Rf3 Na5 26.Rxf4 Nc4 27.Qc1 Qe2 28.Bg5 Ke8 
29.Rf6 Na5 30.Re1 Qc4 31.Re3 Kd7 32.Ref3 Kc6 33.Qa3 Kb7 34.Rxf7 Rxf7 35.
Rxf7 Nc6 36.Qd6 Rc8 37.Qxe6 a5 38.Qd7 Qxc3 39.Qxd5 Qxd4 40.Qxd4 Nxd4 41.
Rd7 Nf5 42.e6 Kc6 43.Bd8 Ng7 44.Rxg7 Rxd8 45.f4 b5 46.axb5+ Kd6 47.f5 a4 
48.e7 Ra8 49.f6 a3 50.Rg8 Rxg8 51.f7 a2 52.fxg8=Q a1=Q+ 53.Kh2 Kxe7 54.
Qg5+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.23"]
[Round "9"]
[White "Uhlmann, Wolfgang"]
[Black "Adorjan, Andras"]
[WhiteElo "2570"]
[BlackElo "2465"]
[Result "0-1"]
[ECO "E74"]
[EventDate "1971.07.13"]
[PlyCount "70"]

1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 d6 5.e4 Nf6 6.Be2 O-O 7.Bg5 h6 8.Bf4 e5 9.
dxe6 Bxe6 10.Bxd6 Re8 11.Nf3 Nc6 12.O-O Nd4 13.e5 Nd7 14.Re1 Nc6 15.Ne4 b6
16.Bf1 Rc8 17.Qb3 Bg4 18.Rad1 Bxf3 19.Qxf3 Nd4 20.Qh3 Nxe5 21.b4 f5 22.
Bxe5 Rxe5 23.Nc3 Qe8 24.Rxe5 Qxe5 25.bxc5 bxc5 26.Nd5 Rb8 27.Qa3 Rb2 28.
Qxa7 Qe4 29.Qa4 Qh4 30.Qe8+ Kh7 31.Qe3 Rxa2 32.Rb1 h5 33.g3 Qe4 34.Qxe4 
fxe4 35.Kg2 Nf5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Adorjan, Andras"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2465"]
[BlackElo "2600"]
[Result "1/2-1/2"]
[ECO "B50"]
[EventDate "1971.07.13"]
[PlyCount "29"]

1.e4 c5 2.Nf3 d6 3.Nc3 Nf6 4.e5 dxe5 5.Nxe5 e6 6.b3 Bd6 7.Nc4 Be7 8.g3 Bd7
9.Ne5 Nc6 10.Nxd7 Qxd7 11.Bg2 O-O 12.O-O Rac8 13.Bb2 Rfd8 14.d3 Nd4 15.a4 
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Bobotsov, Milko"]
[Black "Scholl, Eduard"]
[WhiteElo "2485"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "D94"]
[EventDate "1971.07.13"]
[PlyCount "117"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.cxd5 Nxd5 7.Bc4 Nxc3 8.bxc3
c5 9.O-O Qc7 10.Qe2 b6 11.Bb2 Nc6 12.Rfd1 Bg4 13.Rac1 Rab8 14.h3 Bd7 15.
Bb5 Rfd8 16.c4 a6 17.Bxc6 Bxc6 18.d5 Ba4 19.Rd2 f6 20.e4 e5 21.dxe6 Qe7 
22.Rd5 Qxe6 23.Qd3 Qe7 24.e5 Bc6 25.exf6 Bxf6 26.Re1 Qf8 27.Re6 Bxb2 28.
Rxc6 Bf6 29.Qe4 Re8 30.Ne5 Rb7 31.f4 Qg7 32.Qd3 Bxe5 33.fxe5 Rbe7 34.Rxb6 
Rxe5 35.Rxe5 Qxe5 36.Rxa6 Qe1+ 37.Kh2 Qe5+ 38.Qg3 Qd4 39.Ra7 Rc8 40.Qg4 
Qxg4 41.hxg4 Rb8 42.Ra5 Kf7 43.Rxc5 Ra8 44.Rc7+ Kf6 45.Rxh7 Rxa2 46.Rc7 
Rc2 47.Rc5 Ke6 48.Kg3 Kd6 49.Rd5+ Ke6 50.Rd4 Ke5 51.Rf4 Rc3+ 52.Rf3 Rxc4 
53.Kh4 Ke6 54.Kg5 Ke7 55.g3 Rd4 56.Rf4 Rd6 57.Kh6 Rd3 58.Kxg6 Rxg3 59.g5 
1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Browne, Walter Shawn"]
[Black "Timman, Jan"]
[WhiteElo "2500"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "B09"]
[EventDate "1971.07.13"]
[PlyCount "111"]

1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.f4 Nf6 5.Nf3 O-O 6.Bd3 Nc6 7.e5 dxe5 8.fxe5 
Nh5 9.Be2 Bg4 10.Be3 f6 11.d5 Nxe5 12.Nxe5 Bxe2 13.Qxe2 fxe5 14.O-O-O Qd7 
15.Qb5 Qg4 16.Qxb7 Rab8 17.Qc6 Qb4 18.b3 Nf4 19.Qc5 Nxg2 20.Qxb4 Rxb4 21.
Bc5 Rbf4 22.Bxe7 R8f7 23.d6 cxd6 24.Bxd6 Rf3 25.Ne4 R7f4 26.Ng5 Rc3 27.Rd2
Ne3 28.Ne6 Rf1+ 29.Rxf1 Nxf1 30.Nxg7 Nxd2 31.Kxd2 Rc6 32.Bxe5 Kf7 33.c4 
Rc5 34.Bd4 Rg5 35.c5 Rg2+ 36.Kd3 Rxa2 37.c6 Ra6 38.c7 Rc6 39.Be5 Ke7 40.
Kd4 Kd7 41.Kd5 Rc1 42.Ne6 Rd1+ 43.Ke4 Re1+ 44.Kd4 Rd1+ 45.Kc3 Rc1+ 46.Kd2 
Rf1 47.Nd4 Rf8 48.Kd3 a5 49.Kc4 g5 50.Kd5 h5 51.Nc6 Ra8 52.Nb8+ Kc8 53.Kc6
a4 54.bxa4 Rxa4 55.Nd7 Rc4+ 56.Kd5 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Donner, Jan"]
[Black "Ree, Hans"]
[WhiteElo "2500"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "D90"]
[EventDate "1971.07.13"]
[PlyCount "26"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.cxd5 Nxd5 6.Bd2 c5 7.Rc1 Nxc3 8.bxc3
cxd4 9.Nxd4 O-O 10.e3 Qd5 11.Qb3 Qxb3 12.axb3 Bd7 13.Be2 Nc6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Evans, Larry Melvyn"]
[Black "Smyslov, Vassily"]
[WhiteElo "2550"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "B10"]
[EventDate "1971.07.13"]
[PlyCount "30"]

1.e4 c6 2.d3 d5 3.Nd2 g6 4.g3 Bg7 5.Bg2 e5 6.Ngf3 Ne7 7.O-O O-O 8.c3 Nd7 
9.d4 exd4 10.Nxd4 Ne5 11.exd5 Nxd5 12.N2f3 Bg4 13.h3 Nxf3+ 14.Nxf3 Bd7 15.
Re1 Re8 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Hartoch, Robert"]
[Black "Portisch, Lajos"]
[WhiteElo "2400"]
[BlackElo "2630"]
[Result "0-1"]
[ECO "A22"]
[EventDate "1971.07.13"]
[PlyCount "76"]

1.c4 e5 2.Nc3 Nf6 3.g3 Bb4 4.Bg2 O-O 5.e4 d6 6.Nge2 Nc6 7.O-O Bc5 8.h3 a6 
9.Kh2 Rb8 10.a3 b5 11.b4 Ba7 12.d3 Nd4 13.f4 exf4 14.Bxf4 Nd7 15.cxb5 axb5
16.a4 Nxe2 17.Nxe2 bxa4 18.Rxa4 Bb6 19.d4 Bb7 20.Nc3 Qf6 21.b5 Qg6 22.Bf3 
Nf6 23.Re1 Rfe8 24.d5 Nd7 25.Rf1 Qf6 26.Qd2 Ne5 27.Be2 Ra8 28.Be3 Qxf1 29.
Rxa8 Rxa8 30.Bxf1 Nf3+ 31.Kg2 Nxd2 32.Bxd2 Ra1 33.Bc4 Ba5 34.Nb1 Bc8 35.
Bxa5 Rxa5 36.Nc3 Ra3 37.Nb1 Re3 38.Nd2 Rc3 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Ivkov, Borislav"]
[Black "Keres, Paul"]
[WhiteElo "2560"]
[BlackElo "2615"]
[Result "1/2-1/2"]
[ECO "C75"]
[EventDate "1971.07.13"]
[PlyCount "27"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.O-O Bd7 6.c3 Nge7 7.d4 Ng6 8.Re1 Be7
9.Nbd2 h6 10.Nf1 Bg5 11.Ne3 Bxe3 12.Bxe3 O-O 13.dxe5 Ncxe5 14.Nxe5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.24"]
[Round "10"]
[White "Langeweg, Christian"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2425"]
[BlackElo "2570"]
[Result "1/2-1/2"]
[ECO "D90"]
[EventDate "1971.07.13"]
[PlyCount "74"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 d5 4.d4 Bg7 5.cxd5 Nxd5 6.Bd2 O-O 7.Rc1 c6 8.Bg5 
Bg4 9.e3 Qa5 10.Qa4 Qxa4 11.Nxa4 Nd7 12.Be2 h6 13.Bh4 f5 14.Nc3 Nxc3 15.
bxc3 Bxf3 16.Bxf3 e5 17.Be7 Rfe8 18.Bb4 a5 19.Ba3 exd4 20.cxd4 Bxd4 21.O-O
Be5 22.Rb1 Rab8 23.Rfd1 Nf6 24.Bc5 Ne4 25.Bxe4 fxe4 26.Bb6 Re7 27.g3 Rf7 
28.Rdc1 Re8 29.Rc5 Bd6 30.Rxa5 Ref8 31.Rb2 Rf5 32.Ra7 R8f7 33.Ra4 Re7 34.
Ra8+ Kf7 35.a4 Rd5 36.Rh8 h5 37.Ra8 Ke6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Gligoric, Svetozar"]
[Black "Langeweg, Christian"]
[WhiteElo "2600"]
[BlackElo "2425"]
[Result "1-0"]
[ECO "D80"]
[EventDate "1971.07.13"]
[PlyCount "23"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5 Ne4 5.Bh4 c5 6.e3 Qa5 7.Qb3 Nc6 8.Nf3 cxd4
9.exd4 Bg7 10.cxd5 Nxc3 11.bxc3 Bxd4 12.Rc1 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Keres, Paul"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2615"]
[BlackElo "2500"]
[Result "1/2-1/2"]
[ECO "A34"]
[EventDate "1971.07.13"]
[PlyCount "34"]

1.c4 c5 2.Nf3 g6 3.Nc3 Bg7 4.e3 Nf6 5.d4 O-O 6.Be2 cxd4 7.exd4 d5 8.O-O 
Nc6 9.Be3 Bg4 10.Ne5 Bxe2 11.Qxe2 dxc4 12.Nxc6 bxc6 13.Qxc4 Ng4 14.h3 Nxe3
15.fxe3 Rc8 16.Rad1 Qb6 17.Rf2 e5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "Bobotsov, Milko"]
[WhiteElo "2630"]
[BlackElo "2485"]
[Result "1-0"]
[ECO "D37"]
[EventDate "1971.07.13"]
[PlyCount "81"]

1.d4 d5 2.c4 e6 3.Nc3 Be7 4.Nf3 Nf6 5.Bf4 c5 6.dxc5 Na6 7.Bd6 Nxc5 8.Bxe7 
Qxe7 9.cxd5 exd5 10.e3 O-O 11.Be2 Nce4 12.Qd4 Nxc3 13.Qxc3 Bg4 14.O-O Rac8
15.Qb3 Rc7 16.Nd4 Bxe2 17.Nxe2 Qe5 18.Rad1 Rd8 19.Rd4 Rcd7 20.Rfd1 Ne4 21.
Nf4 Nf6 22.h3 g6 23.Qa4 a6 24.Qb3 Kg7 25.a4 h5 26.Nd3 Qe7 27.a5 Kg8 28.Nf4
Qc5 29.Qd3 Kg7 30.Qxg6+ fxg6 31.Ne6+ Kf7 32.Nxc5 Rc7 33.b4 Re8 34.h4 Re5 
35.g3 Rf5 36.Kg2 Re7 37.Nd3 Rc7 38.Nf4 Rc2 39.R1d2 Rxd2 40.Rxd2 g5 41.hxg5
1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Ree, Hans"]
[Black "Hartoch, Robert"]
[WhiteElo "2430"]
[BlackElo "2400"]
[Result "0-1"]
[ECO "E62"]
[EventDate "1971.07.13"]
[PlyCount "62"]

1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 g6 5.Bg2 Bg7 6.O-O O-O 7.d4 d6 8.d5 Nb8 
9.c5 a5 10.cxd6 cxd6 11.Nd2 Na6 12.Nc4 Nc5 13.f4 exf4 14.Bxf4 Ra6 15.e4 b5
16.Nxd6 Rxd6 17.e5 b4 18.exf6 Rxf6 19.Ne4 Nxe4 20.Bxe4 g5 21.Bc1 Rxf1+ 22.
Qxf1 Re8 23.Qd3 f5 24.Bxf5 Qb6+ 25.Kg2 Ba6 26.Qf3 Re2+ 27.Kh3 Qh6+ 28.Kg4 
Rxh2 29.Be6+ Kh8 30.Bxg5 Qg6 31.Qf7 Be2+ 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Scholl, Eduard"]
[Black "Ivkov, Borislav"]
[WhiteElo "2430"]
[BlackElo "2560"]
[Result "0-1"]
[ECO "B92"]
[EventDate "1971.07.13"]
[PlyCount "130"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5 7.Nb3 Be7 8.O-O 
Be6 9.f4 Qc7 10.a4 Nbd7 11.f5 Bc4 12.a5 b5 13.axb6 Nxb6 14.Kh1 O-O 15.Be3 
Rfc8 16.Bxb6 Qxb6 17.Bxc4 Rxc4 18.Qe2 Rac8 19.Ra2 Bd8 20.Rfa1 Qb7 21.Ra4 
Rxa4 22.Rxa4 Rc6 23.Qd3 g6 24.fxg6 hxg6 25.Ra1 Kg7 26.h3 Nh5 27.Nd5 Qb5 
28.Rd1 Bg5 29.g4 Nf4 30.Nxf4 Bxf4 31.Qxb5 axb5 32.c3 Rc4 33.Re1 b4 34.Na5 
Rc8 35.c4 Bg5 36.Rd1 Bd8 37.Nb7 Be7 38.b3 Rc6 39.Rd5 f5 40.gxf5 gxf5 41.
exf5 Kf6 42.Kg2 Kxf5 43.h4 Ra6 44.h5 Ra2+ 45.Kg1 Ke6 46.h6 Ra8 47.Na5 Rh8 
48.Nc6 Bg5 49.Nxb4 Bxh6 50.Nc2 Ra8 51.Rd3 Bf4 52.b4 Ra2 53.Ne3 e4 54.Rb3 
Bxe3+ 55.Rxe3 Ke5 56.b5 Rb2 57.Rc3 Rb1+ 58.Kf2 Kd4 59.Re3 Rb4 60.Re1 Rxc4 
61.Rb1 Rc7 62.b6 Rb7 63.Rd1+ Ke5 64.Rb1 d5 65.Rb4 Kd6 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Smyslov, Vassily"]
[Black "Adorjan, Andras"]
[WhiteElo "2620"]
[BlackElo "2465"]
[Result "1-0"]
[ECO "A04"]
[EventDate "1971.07.13"]
[PlyCount "47"]

1.Nf3 c5 2.b3 Nf6 3.Bb2 g6 4.e4 Bg7 5.e5 Nd5 6.Nc3 Nf4 7.d4 Nc6 8.g3 cxd4 
9.Nxd4 Nxd4 10.Qxd4 Ne6 11.Qe3 d6 12.f4 dxe5 13.Bb5+ Kf8 14.fxe5 Qd4 15.
Qxd4 Nxd4 16.O-O-O Bxe5 17.Nd5 Nxb5 18.Bxe5 f6 19.Nxf6 exf6 20.Rd8+ Kg7 
21.Bxf6+ Kxf6 22.Rxh8 Kg7 23.Rd8 Nc7 24.Re1 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Timman, Jan"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2445"]
[BlackElo "2550"]
[Result "1-0"]
[ECO "B50"]
[EventDate "1971.07.13"]
[PlyCount "97"]

1.e4 c5 2.Nf3 d6 3.Nc3 Nf6 4.e5 dxe5 5.Nxe5 a6 6.Be2 g6 7.O-O Bg7 8.Bf3 
O-O 9.Re1 Nbd7 10.Nc4 Ne8 11.d3 e6 12.Bf4 Nb6 13.a4 Nd5 14.Bd2 Nxc3 15.
Bxc3 Bxc3 16.bxc3 Rb8 17.a5 Nd6 18.Nb6 Qf6 19.c4 Nf5 20.Be4 Kg7 21.Bxf5 
Qxf5 22.Qe2 Kf6 23.Qe3 Rd8 24.Qg3 e5 25.Re3 Kg7 26.Qxe5+ Qf6 27.Rae1 Be6 
28.Qxc5 h5 29.Qe5 Qxe5 30.Rxe5 Rd4 31.R5e4 Rbd8 32.h4 R4d6 33.f3 Rc6 34.
Kf2 Kf6 35.Re5 Rd4 36.Kg3 Ke7 37.Nd5+ Kd6 38.Nf4 Ke7 39.Rd5 Rd6 40.c3 Rxf4
41.Kxf4 Rc6 42.c5 Kf6 43.Rde5 Rc7 44.d4 Rd7 45.g4 hxg4 46.fxg4 Bd5 47.g5+ 
Kg7 48.Re7 Rd8 49.Re8 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.26"]
[Round "11"]
[White "Uhlmann, Wolfgang"]
[Black "Donner, Jan"]
[WhiteElo "2570"]
[BlackElo "2500"]
[Result "1-0"]
[ECO "E74"]
[EventDate "1971.07.13"]
[PlyCount "84"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 h6 7.Be3 c5 8.d5 e6 9.
dxe6 Bxe6 10.Qd2 Kh7 11.h3 Nc6 12.Nf3 Qe7 13.O-O Rfd8 14.Rad1 a6 15.Bf4 
Ne8 16.a3 Rab8 17.Nd5 Bxd5 18.exd5 Ne5 19.b4 Nd7 20.Rfe1 Qf8 21.Rb1 Nef6 
22.Bd3 Re8 23.Rxe8 Rxe8 24.Qc2 Ra8 25.Bf1 a5 26.bxa5 Rxa5 27.Rxb7 Rxa3 28.
Rc7 Qe7 29.Qe2 Qxe2 30.Bxe2 Bf8 31.g4 Ra8 32.h4 Rd8 33.g5 Ne8 34.Rb7 h5 
35.Nd2 Bg7 36.Ne4 Be5 37.Bxe5 Nxe5 38.f4 Nd7 39.Bd1 Kg7 40.Ba4 Nf8 41.Bxe8
Rxe8 42.Nxd6 Re1+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Adorjan, Andras"]
[Black "Timman, Jan"]
[WhiteElo "2465"]
[BlackElo "2445"]
[Result "0-1"]
[ECO "B05"]
[EventDate "1971.07.13"]
[PlyCount "80"]

1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 5.Be2 e6 6.O-O Be7 7.c4 Nb6 8.exd6 
cxd6 9.h3 Bh5 10.Nc3 O-O 11.b3 Nc6 12.Be3 d5 13.c5 Bxf3 14.Bxf3 Nc8 15.Qd2
Bf6 16.g4 g6 17.Bg2 b6 18.Na4 bxc5 19.Nxc5 Nd6 20.Rac1 Rc8 21.a4 Qe7 22.
Rc2 a5 23.Rfc1 Nb4 24.Rc3 e5 25.dxe5 Bxe5 26.Bh6 Rfe8 27.Re3 Nc4 28.bxc4 
Qxc5 29.Rce1 dxc4 30.Qd7 Nd3 31.R1e2 Red8 32.Qb5 Qxb5 33.axb5 Bf4 34.Bxf4 
Nxf4 35.Ra2 Rd1+ 36.Kh2 Nxg2 37.Kxg2 Rb1 38.b6 Rxb6 39.Rxa5 c3 40.Ra1 c2 
0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Browne, Walter Shawn"]
[Black "Scholl, Eduard"]
[WhiteElo "2500"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "C94"]
[EventDate "1971.07.13"]
[PlyCount "75"]

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 Nb8 10.d3 c5 11.Nbd2 Nc6 12.Nf1 Ne8 13.Ne3 Nc7 14.Nd5 Be6 15.Nxe7+ 
Qxe7 16.Bc2 h6 17.d4 Bd7 18.Be3 Rfd8 19.Qe2 Rac8 20.Rad1 a5 21.Rd2 b4 22.
dxc5 dxc5 23.Red1 bxc3 24.bxc3 Be8 25.Rxd8 Rxd8 26.Qc4 Rxd1+ 27.Bxd1 Ne6 
28.Qd5 Nc7 29.Qc4 Ne6 30.Bb3 Qb7 31.Qd5 Qa6 32.Nxe5 Nxe5 33.Qxe5 c4 34.Bd1
Qb7 35.Bg4 Qb1+ 36.Kh2 Qxa2 37.Bxe6 fxe6 38.Bd4 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Donner, Jan"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2500"]
[BlackElo "2600"]
[Result "1/2-1/2"]
[ECO "E74"]
[EventDate "1971.07.13"]
[PlyCount "32"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 h6 7.Be3 c5 8.d5 e6 9.
dxe6 Bxe6 10.Qd2 Kh7 11.h3 Nc6 12.Nf3 Qe7 13.O-O Rad8 14.Rad1 Rfe8 15.Rfe1
Qf8 16.Bf4 Nd4 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Evans, Larry Melvyn"]
[Black "Keres, Paul"]
[WhiteElo "2550"]
[BlackElo "2615"]
[Result "1/2-1/2"]
[ECO "A23"]
[EventDate "1971.07.13"]
[PlyCount "80"]

1.c4 e5 2.Nc3 Nf6 3.g3 c6 4.Nf3 e4 5.Nd4 d5 6.cxd5 Qb6 7.Qa4 Bc5 8.dxc6 
O-O 9.cxb7 Bxb7 10.e3 Bxd4 11.Qxd4 Qxd4 12.exd4 Nc6 13.Bg2 Nxd4 14.O-O Ba6
15.Rd1 Rfe8 16.b3 Bd3 17.Bb2 Rad8 18.h3 h5 19.Rac1 Nh7 20.Kh1 Ng5 21.Na4 
Ngf3 22.Bxd4 Rxd4 23.Nc3 Ba6 24.a3 f5 25.Rc2 Rc8 26.b4 Rd7 27.Bxf3 exf3 
28.Re1 Rcd8 29.Kg1 h4 30.b5 Bb7 31.gxh4 Kf7 32.Rcc1 Rh8 33.Re5 Rxh4 34.Kh2
f4 35.Rce1 Rxd2 36.Re7+ Kg6 37.Rg1+ Kf6 38.Rgxg7 Rxf2+ 39.Kg1 Rc2 40.Rgf7+
Kg6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Hartoch, Robert"]
[Black "Bobotsov, Milko"]
[WhiteElo "2400"]
[BlackElo "2485"]
[Result "1/2-1/2"]
[ECO "B36"]
[EventDate "1971.07.13"]
[PlyCount "57"]

1.c4 g6 2.e4 c5 3.Nf3 Nc6 4.d4 cxd4 5.Nxd4 Nf6 6.Nc3 Nxd4 7.Qxd4 d6 8.Be3 
Bg7 9.f3 O-O 10.Qd2 Bd7 11.Rc1 Qa5 12.Bd3 Rfc8 13.O-O a6 14.b3 b5 15.Rc2 
b4 16.Ne2 Rab8 17.h3 Be8 18.f4 Nd7 19.Kh1 Nc5 20.f5 Bc6 21.Rf4 Qc7 22.Rh4 
e6 23.Nd4 Qb7 24.Nxc6 Qxc6 25.Bh6 Be5 26.Be3 Re8 27.Bxc5 Qxc5 28.Qh6 exf5 
29.exf5 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Ivkov, Borislav"]
[Black "Portisch, Lajos"]
[WhiteElo "2560"]
[BlackElo "2630"]
[Result "1/2-1/2"]
[ECO "E19"]
[EventDate "1971.07.13"]
[PlyCount "30"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 8.Qc2 
Nxc3 9.Qxc3 c5 10.Rd1 d6 11.b3 Bf6 12.Bb2 Qe7 13.Qd2 Rd8 14.dxc5 bxc5 15.
Bxf6 Qxf6 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Langeweg, Christian"]
[Black "Smyslov, Vassily"]
[WhiteElo "2425"]
[BlackElo "2620"]
[Result "0-1"]
[ECO "A15"]
[EventDate "1971.07.13"]
[PlyCount "38"]

1.Nf3 Nf6 2.c4 b6 3.g3 Bb7 4.Bg2 g6 5.Nc3 Bg7 6.d3 d5 7.cxd5 Nxd5 8.Nxd5 
Bxd5 9.Qa4+ Qd7 10.Qf4 Nc6 11.O-O Rd8 12.Qa4 O-O 13.Rd1 a5 14.Qh4 Bxf3 15.
Bxf3 Nd4 16.Qe4 e6 17.Bg5 f6 18.Bf4 g5 19.Bc1 f5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.27"]
[Round "12"]
[White "Ree, Hans"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2430"]
[BlackElo "2570"]
[Result "1/2-1/2"]
[ECO "A42"]
[EventDate "1971.07.13"]
[PlyCount "63"]

1.c4 g6 2.e4 Bg7 3.d4 d6 4.Nc3 Nc6 5.Be3 e5 6.d5 Nce7 7.g4 Nf6 8.h3 c5 9.
Bd3 O-O 10.Nge2 Ne8 11.Ng3 Bd7 12.Qd2 a6 13.f3 f5 14.gxf5 gxf5 15.exf5 
Nxf5 16.Nxf5 Bxf5 17.O-O-O b5 18.Rdg1 Bxd3 19.Qxd3 Rxf3 20.Ne4 Qd7 21.Ng5 
Qf5 22.Qd2 bxc4 23.Nxf3 Qxf3 24.Rh2 c3 25.bxc3 Rb8 26.Bh6 Kh8 27.Rf2 Qe4 
28.Bxg7+ Nxg7 29.Qc2 Qe3+ 30.Qd2 Qe4 31.Qc2 Qe3+ 32.Qd2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Bobotsov, Milko"]
[Black "Ivkov, Borislav"]
[WhiteElo "2485"]
[BlackElo "2560"]
[Result "1/2-1/2"]
[ECO "A42"]
[EventDate "1971.07.13"]
[PlyCount "132"]

1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 e5 5.Nge2 Nc6 6.d5 Nce7 7.f3 f5 8.Bg5 h6 9.
Be3 Nf6 10.Qd2 h5 11.O-O-O fxe4 12.Nxe4 Nf5 13.Bg5 Nxe4 14.fxe4 Qxg5 15.
Qxg5 Bh6 16.Qd2 Bxd2+ 17.Kxd2 Nh6 18.h3 Ke7 19.Nc3 Bd7 20.Be2 h4 21.Rdf1 
Raf8 22.Rxf8 Rxf8 23.Rf1 Rf4 24.b4 b6 25.c5 dxc5 26.bxc5 Rxf1 27.Bxf1 bxc5
28.Bb5 Nf7 29.Bxd7 Kxd7 30.Na4 c4 31.Nc5+ Kc8 32.Ne6 Nd6 33.Ng5 c6 34.dxc6
Kc7 35.Ke3 Kxc6 36.Nf3 Kc5 37.Nxe5 g5 38.Nf3 Nf7 39.Nd4 a5 40.a3 Nd8 41.
Nf3 Ne6 42.Kd2 a4 43.Ke3 Nf4 44.Nxg5 Nxg2+ 45.Kd2 Kd4 46.Kc2 Ne1+ 47.Kd2 
Ng2 48.Kc2 Ne3+ 49.Kc1 Kc3 50.e5 Kb3 51.e6 Nd5 52.Nf3 c3 53.Nd4+ Kxa3 54.
Kc2 Kb4 55.Ne2 Ne3+ 56.Kd3 Nf5 57.Nxc3 a3 58.Na2+ Kb3 59.Nc3 Ne7 60.Kd4 
Nc6+ 61.Kd3 Kb4 62.Na2+ Kc5 63.Nc3 Ne7 64.Kc2 Kc4 65.Nb1 Kb4 66.Nxa3 Kc5 
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Gligoric, Svetozar"]
[Black "Ree, Hans"]
[WhiteElo "2600"]
[BlackElo "2430"]
[Result "1/2-1/2"]
[ECO "A75"]
[EventDate "1971.07.13"]
[PlyCount "53"]

1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 
9.O-O a6 10.a4 Bg4 11.Bg5 Nbd7 12.Nd2 Bxe2 13.Qxe2 Re8 14.Rae1 Qc7 15.f4 
b5 16.axb5 axb5 17.Nxb5 Qb6 18.Kh1 Nxd5 19.Na3 Nb4 20.Nac4 Qc6 21.Nf3 d5 
22.exd5 Rxe2 23.dxc6 Rxe1 24.Rxe1 Nxc6 25.Kg1 Nd4 26.Nxd4 Bxd4+ 27.Kf1 
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Keres, Paul"]
[Black "Adorjan, Andras"]
[WhiteElo "2615"]
[BlackElo "2465"]
[Result "1-0"]
[ECO "A40"]
[EventDate "1971.07.13"]
[PlyCount "127"]

1.Nf3 g6 2.d4 c5 3.dxc5 Qa5+ 4.Qd2 Qxc5 5.b4 Qc6 6.Bb2 Nf6 7.Nd4 Qb6 8.c4 
Bg7 9.c5 Qd8 10.g3 O-O 11.Bg2 a5 12.b5 d6 13.cxd6 exd6 14.O-O Nbd7 15.Na3 
Nc5 16.Rad1 Re8 17.Qc2 Bd7 18.Nc4 Nce4 19.f3 d5 20.fxe4 dxc4 21.Qxc4 Rc8 
22.Qb3 Qb6 23.Kh1 Rc5 24.Qf3 a4 25.Qf4 Bc8 26.Rd3 Qc7 27.Rdf3 Qxf4 28.Rxf4
Ng4 29.Rxf7 Be5 30.R7f3 Rc4 31.Rd3 a3 32.Ba1 Rf8 33.Bf3 h5 34.Kg1 h4 35.
Nb3 Bxa1 36.Rxa1 Ne5 37.Re3 Bg4 38.gxh4 Bxf3 39.exf3 Rxf3 40.Rxf3 Nxf3+ 
41.Kf2 Ne5 42.Ke3 Rc2 43.Kd4 Nd7 44.e5 Kf7 45.Rc1 Rxa2 46.Rc7 Ke6 47.Rxb7 
Rxh2 48.Nc5+ Nxc5 49.Rb6+ Kf7 50.Kxc5 Rxh4 51.Rf6+ Kg7 52.Ra6 Re4 53.Kd6 
Rd4+ 54.Kc6 Rc4+ 55.Kd5 Rb4 56.Kc5 Re4 57.Kd6 Rd4+ 58.Kc7 Rc4+ 59.Kb8 Kf7 
60.b6 Rc6 61.Kb7 Re6 62.Ka7 Rxe5 63.b7 Re7 64.Ka8 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Portisch, Lajos"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2630"]
[BlackElo "2500"]
[Result "1-0"]
[ECO "E56"]
[EventDate "1971.07.13"]
[PlyCount "78"]

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 
Nc6 9.a3 Ba5 10.Na4 cxd4 11.exd4 h6 12.Qd3 Bc7 13.Nc3 b6 14.Rd1 Bb7 15.b4 
Rc8 16.Bb2 Bb8 17.Rac1 Qd6 18.Ba6 Qd7 19.Bxb7 Qxb7 20.d5 exd5 21.Nxd5 Nxd5
22.Qxd5 Nd8 23.Rxc8 Qxc8 24.Ne5 Qc2 25.Nd7 Re8 26.Bxg7 Kxg7 27.Qd4+ Be5 
28.Nxe5 Ne6 29.Qa1 Kh7 30.h3 Nf4 31.Re1 Rg8 32.Ng4 Nxh3+ 33.gxh3 h5 34.Qf6
hxg4 35.Qxf7+ Kh8 36.Qf6+ Rg7 37.Qh6+ Qh7 38.Re8+ Rg8 39.Rxg8+ Kxg8 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Scholl, Eduard"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2430"]
[BlackElo "2550"]
[Result "0-1"]
[ECO "B94"]
[EventDate "1971.07.13"]
[PlyCount "82"]

1.e4 c5 2.Nf3 d6 3.Nc3 Nf6 4.d4 cxd4 5.Nxd4 a6 6.Bg5 Nbd7 7.Bc4 e6 8.O-O 
h6 9.Bh4 Ne5 10.Bxf6 Qxf6 11.Bb3 g5 12.Qd2 h5 13.Nce2 Bd7 14.a4 h4 15.f3 
Rc8 16.h3 Ng6 17.c3 Qe5 18.Rae1 Bh6 19.Qd1 Kd8 20.Kh1 Kc7 21.Nc1 Rhd8 22.
Nd3 Qa5 23.Bc2 Kb8 24.Ne2 Be8 25.Qb1 Ne5 26.b4 Qb6 27.a5 Qa7 28.Nxe5 dxe5 
29.Bd3 Bf8 30.Rd1 Qe3 31.Rfe1 Ba4 32.Bc2 Rxd1 33.Qxd1 Bxc2 34.Qxc2 Bxb4 
35.Rb1 Bxa5 36.Qb2 Rc7 37.c4 f6 38.Qa2 Bb6 39.Rd1 Qc5 40.Rb1 Ka7 41.Qb3 
Rc6 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Smyslov, Vassily"]
[Black "Donner, Jan"]
[WhiteElo "2620"]
[BlackElo "2500"]
[Result "1/2-1/2"]
[ECO "E61"]
[EventDate "1971.07.13"]
[PlyCount "36"]

1.c4 g6 2.Nc3 Bg7 3.d4 Nf6 4.Bg5 d6 5.e3 O-O 6.Be2 c6 7.Nf3 Bg4 8.h3 Bxf3 
9.Bxf3 e6 10.O-O d5 11.cxd5 cxd5 12.Qb3 Qd7 13.Na4 b6 14.Rfc1 Nc6 15.Nc3 
Rfc8 16.Be2 Qb7 17.Qd1 Ne8 18.Bf4 Bf8 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Timman, Jan"]
[Black "Langeweg, Christian"]
[WhiteElo "2445"]
[BlackElo "2425"]
[Result "1-0"]
[ECO "A26"]
[EventDate "1971.07.13"]
[PlyCount "59"]

1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4 Nge7 7.Nge2 O-O 8.O-O f5 
9.Nd5 Be6 10.Be3 Qd7 11.Qd2 Rf7 12.Rac1 Nd8 13.f4 Nc8 14.exf5 Bxf5 15.d4 
Ne6 16.fxe5 dxe5 17.dxe5 Bxe5 18.Rcd1 Nd6 19.Qc1 Qa4 20.c5 Ne8 21.Ndc3 Qa6
22.b4 c6 23.b5 cxb5 24.g4 Bxg4 25.Rxf7 Kxf7 26.Rd7+ Kg8 27.Bxb7 Qa5 28.
Bxa8 b4 29.Nd5 Bxe2 30.Ne7+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.28"]
[Round "13"]
[White "Uhlmann, Wolfgang"]
[Black "Hartoch, Robert"]
[WhiteElo "2570"]
[BlackElo "2400"]
[Result "1/2-1/2"]
[ECO "E74"]
[EventDate "1971.07.13"]
[PlyCount "83"]

1.d4 Nf6 2.c4 c5 3.d5 d6 4.Nc3 g6 5.e4 Bg7 6.Be2 O-O 7.Bg5 a6 8.a4 Qa5 9.
Bd2 e6 10.Nf3 Qc7 11.O-O exd5 12.cxd5 Re8 13.Qc2 Bg4 14.h3 Bxf3 15.Bxf3 
Nbd7 16.Rfe1 Re7 17.Be2 Rae8 18.Bc4 Ne5 19.Bf1 c4 20.a5 Nfd7 21.Na4 Nf6 
22.Rac1 Ned7 23.f3 Nh5 24.Qxc4 Qxc4 25.Bxc4 Bd4+ 26.Kh1 Ne5 27.Be3 Bxe3 
28.Rxe3 f5 29.Kh2 fxe4 30.Rxe4 Nf6 31.Rf4 Nxc4 32.Rxf6 Kg7 33.Re6 Rxe6 34.
dxe6 Nxa5 35.Rc7+ Kf6 36.b4 Nc6 37.Rxb7 Rb8 38.Rxh7 Rxb4 39.Nc3 Kxe6 40.
Rg7 Rc4 41.Ne4 Ne7 42.h4 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Adorjan, Andras"]
[Black "Scholl, Eduard"]
[WhiteElo "2465"]
[BlackElo "2430"]
[Result "1-0"]
[ECO "C93"]
[EventDate "1971.07.13"]
[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 h6 10.d4 Re8 11.Nbd2 Bf8 12.Nf1 Bd7 13.Ng3 Na5 14.Bc2 c5 15.b3 Nc6 
16.d5 Ne7 17.Be3 Ng6 18.Qd2 a5 19.a4 bxa4 20.bxa4 Qc7 21.Reb1 Reb8 22.Qc1 
Ne7 23.Nd2 Be8 24.Nc4 Nd7 25.Bd3 Nc8 26.Na3 Ndb6 27.Nb5 Qd8 28.c4 Be7 29.
Nf5 Bg5 30.Ra2 Bxe3 31.Qxe3 Bxb5 32.Rxb5 Ne7 33.Nxe7+ Qxe7 34.Qe1 Qa7 35.
Qc3 Nd7 36.Rab2 Rxb5 37.Rxb5 Nb6 38.Be2 g6 39.g3 Kh7 40.f4 f6 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Browne, Walter Shawn"]
[Black "Bobotsov, Milko"]
[WhiteElo "2500"]
[BlackElo "2485"]
[Result "1-0"]
[ECO "B80"]
[EventDate "1971.07.13"]
[PlyCount "82"]

1.e4 c5 2.Nf3 e6 3.Nc3 a6 4.d4 cxd4 5.Nxd4 Nc6 6.g3 d6 7.Bg2 Bd7 8.O-O Nf6
9.Re1 Be7 10.Nxc6 Bxc6 11.a4 O-O 12.Be3 Qc7 13.a5 Nd7 14.Na4 Nc5 15.Nb6 
Rad8 16.Bd4 Rfe8 17.c4 e5 18.Be3 Qb8 19.Nd5 Bxd5 20.cxd5 b5 21.b4 Nd7 22.
Rc1 Rc8 23.Re2 Rc4 24.Rxc4 bxc4 25.Qa4 Qb5 26.Qxb5 axb5 27.Ra2 Ra8 28.Bh3 
Nf6 29.f3 Bd8 30.a6 Kf8 31.a7 Ke7 32.Bc8 Rxc8 33.a8=Q Rxa8 34.Rxa8 Ne8 35.
Rb8 Nc7 36.Kf1 Kd7 37.Bb6 g6 38.Bxc7 Bxc7 39.Rxb5 Kc8 40.Ke2 f5 41.Kd2 h5 
1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Donner, Jan"]
[Black "Timman, Jan"]
[WhiteElo "2500"]
[BlackElo "2445"]
[Result "1-0"]
[ECO "E14"]
[EventDate "1971.07.13"]
[PlyCount "77"]

1.Nf3 Nf6 2.c4 b6 3.d4 Bb7 4.e3 e6 5.Bd3 d5 6.Nc3 Bd6 7.O-O O-O 8.b3 Nbd7 
9.Bb2 a6 10.Qe2 Ne4 11.Rad1 Qe7 12.Nb1 f5 13.Ne5 Bxe5 14.dxe5 Nec5 15.Bc2 
dxc4 16.bxc4 b5 17.Ba3 Nxe5 18.Bb3 Nf3+ 19.gxf3 Qg5+ 20.Kh1 Qh5 21.e4 Rf6 
22.Rg1 Nxe4 23.Rd3 Ng5 24.Nd2 Nh3 25.Rg3 Rh6 26.Rd7 Ng5 27.Rg2 Rg6 28.Bb2 
Kh8 29.Bd1 bxc4 30.Rxc7 Bd5 31.Be5 h6 32.Rg3 Rd8 33.Kg2 Kh7 34.Qe3 Qh4 35.
Be2 Rf8 36.Qf4 Qh5 37.Bxc4 Ba8 38.Bxa6 Rd8 39.Bb7 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Evans, Larry Melvyn"]
[Black "Portisch, Lajos"]
[WhiteElo "2550"]
[BlackElo "2630"]
[Result "1/2-1/2"]
[ECO "B80"]
[EventDate "1971.07.13"]
[PlyCount "82"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qc7 5.Nc3 e6 6.g3 a6 7.Bg2 Nf6 8.O-O 
Be7 9.Re1 d6 10.Nxc6 bxc6 11.e5 dxe5 12.Rxe5 Bb7 13.Re1 c5 14.Bf4 Qc8 15.
Bxb7 Qxb7 16.b3 O-O 17.Qe2 c4 18.Ne4 Rfc8 19.Nd6 Bxd6 20.Bxd6 Qc6 21.Be5 
Nd5 22.Bd4 Ne7 23.Rad1 Nf5 24.Ba1 h6 25.Qe5 Qf3 26.Rd2 Rc6 27.Re3 Qh5 28.
Rc3 Rac8 29.Bb2 Qg5 30.Rd1 Ne7 31.Qe2 Qb5 32.a4 Qb7 33.Qe4 cxb3 34.cxb3 
Nd5 35.Rf3 Rb6 36.Rdd3 Rb8 37.Bd4 Rc6 38.Kg2 f5 39.Qe5 Nf6 40.h3 Ne4 41.
Be3 Rf8 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Hartoch, Robert"]
[Black "Ivkov, Borislav"]
[WhiteElo "2400"]
[BlackElo "2560"]
[Result "1/2-1/2"]
[ECO "A29"]
[EventDate "1971.07.13"]
[PlyCount "63"]

1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 d6 5.Bg2 g6 6.d4 Nd7 7.O-O Bg7 8.d5 Ne7 
9.a3 O-O 10.e4 h6 11.Ne1 f5 12.Nd3 Nf6 13.Bd2 g5 14.exf5 Bxf5 15.Qe2 Bg6 
16.Ne4 Nf5 17.Bc3 Qd7 18.Rae1 Rae8 19.Qd1 Kh8 20.b4 Nd4 21.Nxf6 Bxf6 22.
Be4 Bxe4 23.Rxe4 b5 24.Bxd4 exd4 25.Rxe8 Qxe8 26.cxb5 Qxb5 27.Qb3 Bg7 28.
a4 Qd7 29.Rc1 Rf3 30.Rd1 Qf5 31.b5 h5 32.Qc2 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Langeweg, Christian"]
[Black "Keres, Paul"]
[WhiteElo "2425"]
[BlackElo "2615"]
[Result "1/2-1/2"]
[ECO "A07"]
[EventDate "1971.07.13"]
[PlyCount "55"]

1.Nf3 d5 2.g3 Bg4 3.Bg2 Nd7 4.O-O e6 5.d3 Bd6 6.h3 Bh5 7.e4 c6 8.Qe1 Ne7 
9.Nbd2 O-O 10.Nh4 Qc7 11.d4 Ng6 12.Nhf3 Bxf3 13.Nxf3 dxe4 14.Qxe4 e5 15.
dxe5 Ngxe5 16.Nxe5 Bxe5 17.c3 Rfe8 18.Qf3 Nb6 19.Rd1 Re6 20.Bd2 Nc4 21.b3 
Rf6 22.Qe2 Nxd2 23.Qxd2 h5 24.f4 Bd6 25.h4 a5 26.Re1 Rd8 27.Qe2 Rg6 28.Qf3
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Ree, Hans"]
[Black "Smyslov, Vassily"]
[WhiteElo "2430"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "B17"]
[EventDate "1971.07.13"]
[PlyCount "29"]

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.c3 Bg4 8.
h3 Bxf3 9.Qxf3 e6 10.Bc4 Nd5 11.O-O g6 12.Qg3 Bd6 13.Qf3 O-O 14.Re1 Re8 
15.g3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.29"]
[Round "14"]
[White "Uhlmann, Wolfgang"]
[Black "Gligoric, Svetozar"]
[WhiteElo "2570"]
[BlackElo "2600"]
[Result "1/2-1/2"]
[ECO "E73"]
[EventDate "1971.07.13"]
[PlyCount "136"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 h6 7.Be3 c5 8.dxc5 Qa5 
9.Bd2 Qxc5 10.Nf3 Nc6 11.h3 Nd4 12.Nxd4 Qxd4 13.Qc2 Be6 14.O-O Qc5 15.Be3 
Qa5 16.Rac1 Rfc8 17.b3 Nd7 18.Qd2 Kh7 19.Nd5 Qxd2 20.Bxd2 Bxd5 21.exd5 Nc5
22.Rfe1 a5 23.Bf1 Rc7 24.Be3 Bb2 25.Rc2 Ba3 26.Bd4 e5 27.dxe6 Nxe6 28.Bf6 
d5 29.Rd1 d4 30.Be2 Be7 31.Be5 Rd7 32.Bf3 f6 33.Bg3 Bc5 34.Bd5 Ng7 35.Bf4 
Nh5 36.Bc1 f5 37.Bb2 Nf6 38.Bxd4 Bxd4 39.Rxd4 Rad8 40.Rdd2 Kg7 41.Re2 Nxd5
42.cxd5 Kf7 43.Re5 Rxd5 44.Rc7+ Kf6 45.Ree7 Rd1+ 46.Kh2 Rf1 47.Rf7+ Kg5 
48.Rc2 h5 49.g3 h4 50.Kg2 Rdd1 51.gxh4+ Kxh4 52.Rc4+ Kg5 53.h4+ Kh6 54.
Rxb7 Rh1 55.Ra7 Rdg1+ 56.Kf3 Rh3+ 57.Ke2 Rb1 58.Rd7 Ra1 59.Ra4 Rc1 60.Rd2 
Rc5 61.Kf1 Rc1+ 62.Kg2 Rch1 63.Rd5 R1h2+ 64.Kf1 Rf3 65.Rd2 f4 66.Rxa5 Rc3 
67.Kg1 Rch3 68.Rd3 Rh1+ 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Bobotsov, Milko"]
[Black "Evans, Larry Melvyn"]
[WhiteElo "2485"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "E11"]
[EventDate "1971.07.13"]
[PlyCount "27"]

1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Bxd2+ 5.Qxd2 d6 6.Nc3 Nbd7 7.g3 O-O 8.
Bg2 e5 9.O-O Re8 10.Rad1 exd4 11.Nxd4 Nc5 12.b4 Nce4 13.Nxe4 Nxe4 14.Qc2 
1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Gligoric, Svetozar"]
[Black "Hartoch, Robert"]
[WhiteElo "2600"]
[BlackElo "2400"]
[Result "1-0"]
[ECO "A75"]
[EventDate "1971.07.13"]
[PlyCount "93"]

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 exd5 
9.cxd5 a6 10.a4 Bg4 11.Bg5 Nbd7 12.Nd2 Bxe2 13.Qxe2 Re8 14.f4 Qc7 15.Qf3 
c4 16.Kh1 b6 17.Rae1 h6 18.Bxf6 Nxf6 19.e5 Nh7 20.Nde4 dxe5 21.f5 Qd7 22.
fxg6 fxg6 23.Qg3 g5 24.Qe3 Rab8 25.d6 Qe6 26.Qd2 Rf8 27.Nd5 Kh8 28.Nc7 Qg4
29.Rxf8+ Rxf8 30.h3 Qd7 31.Nd5 Rb8 32.Qf2 b5 33.Ne7 Nf8 34.Nc5 Qe8 35.Nxa6
Rd8 36.Nc7 Qh5 37.Nxb5 Ne6 38.Qf5 Nf4 39.d7 Qh4 40.Rf1 g4 41.Ng6+ Nxg6 42.
Qxg6 c3 43.Nd6 gxh3 44.Nf7+ Kg8 45.Nxd8 hxg2+ 46.Kxg2 Qb4 47.Ne6 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Ivkov, Borislav"]
[Black "Browne, Walter Shawn"]
[WhiteElo "2560"]
[BlackElo "2500"]
[Result "1-0"]
[ECO "A43"]
[EventDate "1971.07.13"]
[PlyCount "105"]

1.d4 c5 2.Nf3 cxd4 3.Nxd4 d5 4.g3 Nf6 5.Bg2 g6 6.O-O Bg7 7.c4 O-O 8.cxd5 
Nxd5 9.Nc3 Nxc3 10.bxc3 Qa5 11.Qb3 Nc6 12.Be3 Nxd4 13.cxd4 Rd8 14.Rfd1 Qb6
15.Rab1 Bf5 16.Qxb6 axb6 17.Rxb6 Rxa2 18.Rxb7 Bg4 19.Bf1 Bf6 20.f3 Be6 21.
Bh6 Ra1 22.Rxa1 Bxd4+ 23.Kg2 Bxa1 24.Rxe7 Bg7 25.Bxg7 Kxg7 26.Kf2 Kf6 27.
Ra7 h5 28.h4 Rd1 29.Bg2 Rb1 30.Ra4 Rc1 31.f4 Rc2 32.Be4 Rb2 33.Bd3 Rb7 34.
Ra5 Bg4 35.Ra2 Re7 36.e4 Rc7 37.Ke3 Rc1 38.Ra6+ Kg7 39.f5 gxf5 40.exf5 Rd1
41.f6+ Kh6 42.Ra8 Rxd3+ 43.Kxd3 Kg6 44.Rg8+ Kxf6 45.Rxg4 hxg4 46.Ke4 Ke6 
47.Kf4 f5 48.Kg5 Ke5 49.h5 Ke4 50.h6 f4 51.h7 fxg3 52.h8=Q g2 53.Qa8+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Keres, Paul"]
[Black "Donner, Jan"]
[WhiteElo "2615"]
[BlackElo "2500"]
[Result "1-0"]
[ECO "B15"]
[EventDate "1971.07.13"]
[PlyCount "91"]

1.e4 c6 2.Nc3 d5 3.Nf3 g6 4.d4 Bg7 5.h3 dxe4 6.Nxe4 Nd7 7.Bc4 Ngf6 8.Qe2 
Nxe4 9.Qxe4 Nb6 10.Bb3 a5 11.a4 Bf5 12.Qh4 Qd7 13.O-O Nd5 14.Re1 h6 15.Bd2
g5 16.Qg3 Qc7 17.Ne5 e6 18.Qf3 O-O-O 19.g4 Bxe5 20.Rxe5 Bg6 21.c4 Nb4 22.
Bc3 Rhe8 23.Rd1 Re7 24.Qe2 Red7 25.Re3 b6 26.Re5 Kb7 27.Bxb4 axb4 28.d5 
exd5 29.cxd5 cxd5 30.Rdxd5 Rxd5 31.Bxd5+ Ka7 32.Bf3 Bd3 33.Qe3 Ba6 34.a5 
Rd7 35.Rf5 Bc4 36.axb6+ Qxb6 37.Ra5+ Ba6 38.Be2 Qxe3 39.Rxa6+ Kb7 40.fxe3 
Rd2 41.Bf1 Rxb2 42.Rxh6 Rc2 43.Rf6 b3 44.Bd3 Rc3 45.Be4+ Kc8 46.Rc6+ 1-0

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Portisch, Lajos"]
[Black "Adorjan, Andras"]
[WhiteElo "2630"]
[BlackElo "2465"]
[Result "0-1"]
[ECO "D97"]
[EventDate "1971.07.13"]
[PlyCount "118"]

1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 a6 8.Qb3 b5
9.e5 Nfd7 10.e6 fxe6 11.Qxe6+ Kh8 12.Qe4 Nb6 13.Be2 Bf5 14.Qh4 Nc6 15.Bh6 
e5 16.Ng5 Bxh6 17.Qxh6 Qe7 18.dxe5 Nd4 19.Rd1 c5 20.Rd2 b4 21.Nd1 Nd5 22.
Bc4 Nf4 23.Nf7+ Rxf7 24.Qxf4 Be6 25.Qe4 Raf8 26.Ne3 Rf4 27.Qd3 Bxc4 28.
Nxc4 Qg5 29.Qg3 Rg4 30.Qe3 Rxg2 31.Qxg5 Rxg5 32.Kd1 Rg2 33.Re1 Kg7 34.Nd6 
Nf3 35.e6 Nxe1 36.e7 Nf3 37.exf8=Q+ Kxf8 38.Rd3 Rg1+ 39.Ke2 Nd4+ 40.Kd2 
Rb1 41.Nc4 Rf1 42.Ke3 Ke7 43.Nd2 Re1+ 44.Kf4 Re2 45.Kg3 Kd6 46.Kg2 Kd5 47.
Kf1 Re7 48.b3 Kc6 49.Nc4 Re6 50.h3 Kb5 51.Rd2 h6 52.Ne3 Kc6 53.Nc4 Kb5 54.
Nb2 a5 55.Na4 Re5 56.Rd3 Re4 57.Re3 Rxe3 58.fxe3 Nxb3 59.axb3 c4 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Scholl, Eduard"]
[Black "Langeweg, Christian"]
[WhiteElo "2430"]
[BlackElo "2425"]
[Result "0-1"]
[ECO "B48"]
[EventDate "1971.07.13"]
[PlyCount "48"]

1.e4 c5 2.Nf3 e6 3.Nc3 Nc6 4.d4 cxd4 5.Nxd4 Qc7 6.Be3 a6 7.Bd3 Nf6 8.O-O 
Ne5 9.h3 Bc5 10.Be2 d6 11.Kh1 O-O 12.Bg5 Ned7 13.a3 b5 14.Nb3 Ba7 15.f4 
Bb7 16.Bd3 Rac8 17.Qe2 Rfe8 18.Rad1 e5 19.Rfe1 h6 20.fxe5 hxg5 21.exf6 
Nxf6 22.Qf1 d5 23.Nxd5 Bxd5 24.exd5 Nh5 0-1

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Smyslov, Vassily"]
[Black "Uhlmann, Wolfgang"]
[WhiteElo "2620"]
[BlackElo "2570"]
[Result "1/2-1/2"]
[ECO "C08"]
[EventDate "1971.07.13"]
[PlyCount "25"]

1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5 5.Bb5+ Bd7 6.Bxd7+ Nxd7 7.Ne2 Ngf6 8.
O-O Bd6 9.dxc5 Nxc5 10.Nf3 O-O 11.Bf4 Re8 12.Bxd6 Qxd6 13.c3 1/2-1/2

[Event "11th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1971.07.31"]
[Round "15"]
[White "Timman, Jan"]
[Black "Ree, Hans"]
[WhiteElo "2445"]
[BlackElo "2430"]
[Result "0-1"]
[ECO "D97"]
[EventDate "1971.07.13"]
[PlyCount "62"]

1.c4 g6 2.Nf3 Bg7 3.d4 Nf6 4.Nc3 d5 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Na6 8.Qb3 
c5 9.d5 e6 10.Bxa6 bxa6 11.O-O exd5 12.e5 c4 13.Qa3 Ne4 14.Nd4 Bxe5 15.Nc6
Bd6 16.Nxd8 Bxa3 17.Nc6 Bc5 18.Bh6 Re8 19.Rad1 Be6 20.Nxd5 Rac8 21.Na5 
Bxd5 22.Rxd5 Nxf2 23.Nb7 Bb6 24.Bg5 Re2 25.Bd8 Be3 26.Rd7 Rxb2 27.Re7 Ng4+
28.Kh1 c3 29.Re8+ Kg7 30.Bf6+ Nxf6 31.Rxc8 c2 0-1

