[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "1"]
[White "Donner, Jan"]
[Black "Timman, Jan"]
[WhiteElo "2475"]
[BlackElo "2620"]
[Result "0-1"]
[ECO "E41"]
[EventDate "1981.05.24"]
[PlyCount "54"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6 8.e4 e5
9.d5 Ne7 10.Nh4 h6 11.f3 Qa5 12.Bd2 g5 13.Nf5 Nxf5 14.exf5 Bd7 15.h4 g4 
16.fxg4 e4 17.Be2 e3 18.Bxe3 Qxc3+ 19.Kf2 h5 20.gxh5 Ne4+ 21.Kf3 Bxf5 22.
Bd3 Rg8 23.Bxe4 Bg4+ 24.Kf2 Bxd1 25.Raxd1 O-O-O 26.Bf5+ Kc7 27.h6 Qf6 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "1"]
[White "Hort, Vlastimil"]
[Black "Karpov, Anatoly"]
[WhiteElo "2575"]
[BlackElo "2690"]
[Result "1-0"]
[ECO "D58"]
[EventDate "1981.05.24"]
[PlyCount "51"]

1.d4 Nf6 2.Nf3 e6 3.c4 d5 4.Nc3 Be7 5.Bg5 h6 6.Bh4 O-O 7.e3 b6 8.Rc1 Bb7 
9.cxd5 exd5 10.Be2 Nbd7 11.O-O c5 12.Qc2 a6 13.Rfd1 c4 14.a4 Bc6 15.Ne5 
Qc7 16.Nxc6 Qxc6 17.Bf3 Bb4 18.Nxd5 Nxd5 19.Qf5 Qxa4 20.Bxd5 Rac8 21.b3 
cxb3 22.Rxc8 Rxc8 23.Qxf7+ Kh8 24.Bxb3 Qb5 25.Be6 Rf8 26.Bxd7 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "1"]
[White "Kavalek, Lubomir"]
[Black "Ljubojevic, Ljubomir"]
[WhiteElo "2550"]
[BlackElo "2605"]
[Result "1-0"]
[ECO "E15"]
[EventDate "1981.05.24"]
[PlyCount "79"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5 6.d5 exd5 7.Nh4 g6 8.Nc3 Bg7 
9.O-O O-O 10.Bf4 Na6 11.Bd6 Re8 12.cxd5 b5 13.Nxb5 Qb6 14.a4 Nb4 15.Bc7 
Qa6 16.Rc1 Bf8 17.d6 Bxg2 18.Nxg2 Re5 19.f3 Bh6 20.Rc4 Nfd5 21.e4 Ne3 22.
Nxe3 Bxe3+ 23.Kg2 Rae8 24.Re1 Bh6 25.f4 R5e6 26.Rxc5 Rxe4 27.Rxe4 Rxe4 28.
Qf3 Re8 29.b3 Bg7 30.Rc4 Nc6 31.Rxc6 dxc6 32.d7 Rf8 33.Nd6 Bf6 34.Ne8 c5 
35.Nxf6+ Qxf6 36.Qd5 Rd8 37.Bxd8 Qxd8 38.Kf2 Kg7 39.Qe5+ Kf8 40.Qxc5+ 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "1"]
[White "Langeweg, Christian"]
[Black "Miles, Anthony John"]
[WhiteElo "2455"]
[BlackElo "2590"]
[Result "0-1"]
[ECO "A46"]
[EventDate "1981.05.24"]
[PlyCount "78"]

1.d4 Nf6 2.Nf3 b5 3.Bg5 Bb7 4.Nbd2 a6 5.c3 e6 6.e4 h6 7.Bxf6 Qxf6 8.Bd3 c5
9.O-O Qd8 10.Qe2 cxd4 11.cxd4 Be7 12.Rac1 d6 13.a3 Nd7 14.b4 O-O 15.Nb3 
Rc8 16.Rxc8 Qxc8 17.Rc1 Qb8 18.Na5 Rc8 19.Rc2 Bd8 20.Rxc8 Qxc8 21.Nxb7 
Qxb7 22.h4 Bb6 23.Qc2 e5 24.dxe5 dxe5 25.a4 Ba7 26.axb5 axb5 27.Qe2 Nf6 
28.Nxe5 Qc7 29.Qb2 Qd6 30.Qa2 Bxf2+ 31.Qxf2 Qxe5 32.Qc5 Qa1+ 33.Bf1 g6 34.
e5 Ne4 35.Qd5 Qe1 36.Qxb5 Qf2+ 37.Kh2 Qxh4+ 38.Kg1 Kg7 39.e6 Qf2+ 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "1"]
[White "Ree, Hans"]
[Black "Portisch, Lajos"]
[WhiteElo "2485"]
[BlackElo "2650"]
[Result "1/2-1/2"]
[ECO "A78"]
[EventDate "1981.05.24"]
[PlyCount "84"]

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.Kh1 Nc7 12.f3 a6 13.a4 Rb8 14.a5 Bd7 15.Nc4 Bb5 
16.Bg5 Bxc4 17.Bxc4 h6 18.Be3 b5 19.axb6 Rxb6 20.Qd2 Kh7 21.Ra2 Nd7 22.Qe2
Qb8 23.Na4 Rb4 24.Bd2 Rb7 25.Bxa6 Nxa6 26.Qxa6 Ra7 27.Qc4 Ne5 28.Qe2 Qb3 
29.Ra3 Qc4 30.Qd1 Qd4 31.Bc3 Qxd1 32.Rxd1 Nc4 33.Raa1 Bxc3 34.Nxc3 Rb7 35.
Na4 Ra8 36.Ra2 Kg7 37.Nxc5 Rxa2 38.Nxb7 Rxb2 39.Nd8 Ne3 40.Rg1 g5 41.h4 g4
42.fxg4 Nxg4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "1"]
[White "Smyslov, Vassily"]
[Black "Polugaevsky, Lev"]
[WhiteElo "2545"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "A30"]
[EventDate "1981.05.24"]
[PlyCount "40"]

1.Nf3 Nf6 2.c4 b6 3.g3 c5 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.b3 O-O 8.Bb2 d5 
9.e3 Nbd7 10.Qe2 Rc8 11.cxd5 Nxd5 12.Nxd5 Bxd5 13.Rac1 Rc7 14.d4 Qa8 15.
dxc5 Rxc5 16.Rxc5 Nxc5 17.Rd1 Rd8 18.Ne1 Bxg2 19.Rxd8+ Qxd8 20.Kxg2 Qd5+ 
1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "2"]
[White "Hort, Vlastimil"]
[Black "Donner, Jan"]
[WhiteElo "2575"]
[BlackElo "2475"]
[Result "1-0"]
[ECO "B09"]
[EventDate "1981.05.24"]
[PlyCount "77"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.Bd3 Nc6 7.e5 dxe5 8.dxe5 
Nd7 9.Bd2 Nb6 10.O-O Nb4 11.Be2 Bf5 12.Rc1 Qd7 13.a3 Nc6 14.Be3 Rfd8 15.
Qe1 Nd5 16.Nxd5 Qxd5 17.Qc3 e6 18.h3 Qd7 19.Rfd1 Qe8 20.Bf2 Rxd1+ 21.Rxd1 
Rd8 22.Rxd8 Qxd8 23.g4 Be4 24.Nd2 Bd5 25.Qd3 Ba2 26.Qxd8+ Nxd8 27.Bxa7 Nc6
28.Be3 g5 29.Nf3 gxf4 30.Bxf4 Bd5 31.Kf2 b6 32.b4 Bxf3 33.Bxf3 Bxe5 34.Kg3
Bxf4+ 35.Kxf4 Nd4 36.Be4 f6 37.a4 h6 38.Ke3 c5 39.c3 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "2"]
[White "Karpov, Anatoly"]
[Black "Ljubojevic, Ljubomir"]
[WhiteElo "2690"]
[BlackElo "2605"]
[Result "1-0"]
[ECO "E15"]
[EventDate "1981.05.24"]
[PlyCount "67"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5 6.d5 exd5 7.Nh4 b5 8.cxd5 d6 
9.O-O Nbd7 10.a4 a6 11.e4 g6 12.Qe2 bxa4 13.Re1 Bg7 14.Bf4 Qb8 15.Na3 O-O 
16.Nc4 Ne8 17.Rxa4 Bc8 18.Ra2 Nb6 19.Na5 Bd7 20.Nf3 Bb5 21.Qc2 Nf6 22.Nc6 
Bxc6 23.dxc6 Nh5 24.Bd2 Nf6 25.Ba5 Rc8 26.e5 Nfd5 27.e6 f6 28.e7 Kh8 29.
Nh4 Re8 30.Bxb6 Nxb6 31.c7 Qxc7 32.Bxa8 Nxa8 33.Rxa6 Qd7 34.Qd2 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "2"]
[White "Miles, Anthony John"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2590"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "A34"]
[EventDate "1981.05.24"]
[PlyCount "27"]

1.Nf3 Nf6 2.c4 c5 3.Nc3 e6 4.e3 b6 5.a3 Bb7 6.d4 cxd4 7.exd4 d6 8.Bd3 Be7 
9.O-O O-O 10.d5 e5 11.Ne1 a6 12.Be3 Nbd7 13.Kh1 Re8 14.Be2 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "2"]
[White "Polugaevsky, Lev"]
[Black "Langeweg, Christian"]
[WhiteElo "2620"]
[BlackElo "2455"]
[Result "1/2-1/2"]
[ECO "A30"]
[EventDate "1981.05.24"]
[PlyCount "43"]

1.Nf3 Nf6 2.c4 c5 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 d6
9.b3 Nbd7 10.Bb2 a6 11.e4 O-O 12.Nd2 Qc7 13.Rac1 Rac8 14.h3 Rfe8 15.Qd3 
Qb8 16.a4 Nc5 17.Qe2 Qa8 18.Rcd1 Rcd8 19.Rfe1 d5 20.cxd5 exd5 21.e5 Nfe4 
22.Ncb1 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "2"]
[White "Portisch, Lajos"]
[Black "Smyslov, Vassily"]
[WhiteElo "2650"]
[BlackElo "2545"]
[Result "0-1"]
[ECO "D18"]
[EventDate "1981.05.24"]
[PlyCount "82"]

1.Nf3 d5 2.d4 Nf6 3.c4 c6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O 
Nbd7 9.Nh4 Bg4 10.f3 Bh5 11.e4 Nb6 12.Be2 Nfd7 13.g3 a5 14.Be3 O-O 15.Ng2 
f6 16.Nf4 Bf7 17.Nd3 Nc4 18.Bc1 e5 19.dxe5 Ndxe5 20.Kh1 Nxd3 21.Bxd3 Ne5 
22.Be2 Qxd1 23.Nxd1 Rfd8 24.Nf2 Bc4 25.Bxc4+ Nxc4 26.b3 Nd2 27.Bxd2 Rxd2 
28.e5 fxe5 29.Ne4 Rd3 30.Rab1 Rad8 31.Kg2 Re3 32.Rfd1 Rd5 33.Kf2 Rxd1 34.
Rxd1 Rxb3 35.Rd7 h6 36.Ke2 b5 37.axb5 cxb5 38.f4 exf4 39.gxf4 a4 40.f5 a3 
41.Ra7 Rh3 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "2"]
[White "Timman, Jan"]
[Black "Ree, Hans"]
[WhiteElo "2620"]
[BlackElo "2485"]
[Result "1-0"]
[ECO "E81"]
[EventDate "1981.05.24"]
[PlyCount "69"]

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 c6 6.Be3 a6 7.Bd3 O-O 8.Nge2 b5 9.
O-O Nbd7 10.b3 e5 11.d5 bxc4 12.Bxc4 c5 13.Qd2 Ne8 14.Rab1 Nb6 15.Bd3 a5 
16.a3 f5 17.f4 Nd7 18.exf5 gxf5 19.b4 axb4 20.axb4 cxb4 21.Rxb4 Nc7 22.
fxe5 Nxe5 23.Bg5 Qe8 24.Bc2 Na6 25.Rh4 Nc5 26.Bh6 Ra7 27.Bxg7 Rxg7 28.Ng3 
Ng6 29.Rh6 Rgf7 30.Rh5 Qe5 31.Rg5 Kh8 32.Nb5 Ba6 33.Re1 Ne4 34.Nxe4 Bxb5 
35.Nc3 1-0


[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "3"]
[White "Donner, Jan"]
[Black "Karpov, Anatoly"]
[WhiteElo "2475"]
[BlackElo "2690"]
[Result "0-1"]
[ECO "E39"]
[EventDate "1981.05.24"]
[PlyCount "106"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O 6.Bf4 Na6 7.Bd6 Re8 8.a3 
Qa5 9.Rc1 Bxc3+ 10.Qxc3 Qxc3+ 11.Rxc3 Ne4 12.Rc2 Naxc5 13.Bxc5 Nxc5 14.Nf3
b6 15.Nd4 a5 16.Nb5 Rd8 17.Nd6 Bb7 18.Nxb7 Nxb7 19.e3 Rac8 20.Bd3 Nc5 21.
Be2 a4 22.f3 Nb3 23.Bd3 Rc5 24.Ke2 Rdc8 25.Rc3 Na5 26.Rhc1 Kf8 27.Kf2 Ke7 
28.Ke2 h6 29.Ke1 Rh5 30.h3 Rhc5 31.Kf2 Nb3 32.R1c2 d6 33.Ke1 g5 34.g3 R5c7
35.Bf1 f5 36.Kf2 Rf8 37.Bg2 f4 38.Bf1 Rc5 39.Bd3 fxe3+ 40.Kxe3 Re5+ 41.Be4
Nc5 42.Kd4 Nb3+ 43.Kd3 Kd7 44.Ke3 Nc5 45.Kd4 Rc8 46.Rf2 Nb3+ 47.Kd3 Rf8 
48.Rfc2 h5 49.Ke3 Nc5 50.Kd4 g4 51.Re3 gxf3 52.Bxf3 Nb3+ 53.Kd3 Rxe3+ 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "3"]
[White "Kavalek, Lubomir"]
[Black "Polugaevsky, Lev"]
[WhiteElo "2550"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "E12"]
[EventDate "1981.05.24"]
[PlyCount "31"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.a3 d5 6.cxd5 Nxd5 7.e3 Nd7 8.Bd3 c5 
9.e4 N5f6 10.Bf4 Be7 11.Nb5 O-O 12.Bc7 Qc8 13.Bd6 Qd8 14.Bc7 Qc8 15.Bd6 
Qd8 16.Bc7 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "3"]
[White "Langeweg, Christian"]
[Black "Portisch, Lajos"]
[WhiteElo "2455"]
[BlackElo "2650"]
[Result "0-1"]
[ECO "E12"]
[EventDate "1981.05.24"]
[PlyCount "54"]

1.d4 Nf6 2.Nf3 e6 3.c4 b6 4.a3 c5 5.d5 Ba6 6.Qc2 exd5 7.cxd5 Bb7 8.e4 Qe7 
9.Bd3 Nxd5 10.O-O Nc7 11.Bg5 f6 12.Bh4 Nc6 13.Nbd2 Ne6 14.e5 O-O-O 15.Rfe1
Qf7 16.exf6 gxf6 17.Bg3 f5 18.Bc4 Rg8 19.Qa4 f4 20.Bh4 Be7 21.Bxe7 Qxe7 
22.Ne4 Kb8 23.b4 Qg7 24.Bf1 Ncd4 25.Nxd4 Nxd4 26.Qd1 Rde8 27.f3 d5 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "3"]
[White "Ljubojevic, Ljubomir"]
[Black "Miles, Anthony John"]
[WhiteElo "2605"]
[BlackElo "2590"]
[Result "1/2-1/2"]
[ECO "B17"]
[EventDate "1981.05.24"]
[PlyCount "30"]

1.e4 c6 2.d4 d5 3.Nd2 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Ne5 Nd7 8.
Nd3 g6 9.c3 Bg7 10.Bf4 Qa5 11.Qd2 O-O 12.Be2 e5 13.dxe5 Nxe5 14.Nxe5 Bxe5 
15.Bxe5 Qxe5 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "3"]
[White "Ree, Hans"]
[Black "Hort, Vlastimil"]
[WhiteElo "2485"]
[BlackElo "2575"]
[Result "1/2-1/2"]
[ECO "E16"]
[EventDate "1981.05.24"]
[PlyCount "78"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb4+ 5.Bd2 Be7 6.Nc3 Bb7 7.Bg2 O-O 8.O-O 
Na6 9.Rc1 Re8 10.Re1 d5 11.cxd5 exd5 12.Bf4 c5 13.Qa4 Ne4 14.Red1 Nxc3 15.
Rxc3 Nb4 16.dxc5 bxc5 17.Ne5 a5 18.Rcc1 Bd6 19.Nd3 Rxe2 20.Bxd6 Nxd3 21.
Rxd3 Qxd6 22.Qb5 Qf6 23.Qxc5 h6 24.Rf3 Qe6 25.Re3 Rxe3 26.Qxe3 Re8 27.Qa7 
Ba6 28.h4 a4 29.Kh2 Rd8 30.Qd4 Qf6 31.Qxa4 Qxb2 32.Rc2 Qb5 33.Qd4 Qd3 34.
Qb6 Rf8 35.Rc7 Bc4 36.a4 Qg6 37.Qd4 Qf6 38.Qxf6 gxf6 39.Rd7 Ra8 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "3"]
[White "Smyslov, Vassily"]
[Black "Timman, Jan"]
[WhiteElo "2545"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "A46"]
[EventDate "1981.05.24"]
[PlyCount "72"]

1.d4 Nf6 2.Nf3 e6 3.g3 b5 4.Bg2 Bb7 5.O-O Be7 6.Qd3 a6 7.Nbd2 c5 8.dxc5 
Bxc5 9.a4 b4 10.Nb3 Be4 11.Qd1 Be7 12.Be3 O-O 13.Bc5 Nc6 14.Bxe7 Qxe7 15.
Rc1 Rfc8 16.Nbd2 d5 17.Nxe4 Nxe4 18.Nd2 Nc5 19.c4 bxc3 20.bxc3 Rab8 21.Qc2
Qd7 22.Rb1 Na5 23.Rxb8 Rxb8 24.Rb1 Rxb1+ 25.Qxb1 Nab7 26.c4 dxc4 27.Bxb7 
Qxd2 28.Bd5 g6 29.Bxc4 Qc3 30.Bd3 Kg7 31.Bc2 Kf6 32.Qd1 Ke7 33.f4 e5 34.
fxe5 Qxe5 35.Qd2 h5 36.Kf2 h4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "4"]
[White "Donner, Jan"]
[Black "Ree, Hans"]
[WhiteElo "2475"]
[BlackElo "2485"]
[Result "1/2-1/2"]
[ECO "A64"]
[EventDate "1981.05.24"]
[PlyCount "88"]

1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 c5 5.d5 O-O 6.Nc3 d6 7.Nf3 e6 8.O-O exd5 
9.cxd5 a6 10.a4 Nbd7 11.h3 Re8 12.Nd2 Rb8 13.Nc4 Nb6 14.Na3 Bd7 15.a5 Nc8 
16.Nc4 Bb5 17.Qb3 Na7 18.Bd2 Bxc4 19.Qxc4 Qd7 20.e3 Nb5 21.Ra2 b6 22.axb6 
Rxb6 23.Rfa1 Nc7 24.Na4 Rb7 25.Nc3 Reb8 26.Bc1 Rb4 27.Qd3 Qe7 28.Ra4 Nd7 
29.Rxb4 Rxb4 30.Qc2 Rb8 31.Bf1 Nb6 32.e4 Qd7 33.h4 Re8 34.Bxa6 Nxa6 35.
Rxa6 Rb8 36.Qb3 Qb7 37.Qb5 Be5 38.Bh6 f6 39.Nd1 f5 40.exf5 Nxd5 41.Qxb7 
Rxb7 42.fxg6 hxg6 43.f4 Bd4+ 44.Kf1 Nb6 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "4"]
[White "Hort, Vlastimil"]
[Black "Smyslov, Vassily"]
[WhiteElo "2575"]
[BlackElo "2545"]
[Result "1/2-1/2"]
[ECO "D17"]
[EventDate "1981.05.24"]
[PlyCount "60"]

1.c4 c6 2.d4 d5 3.Nc3 Nf6 4.Nf3 dxc4 5.a4 Bf5 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 
e5 9.dxe5 Nxe5 10.Bf4 Rd8 11.Qc1 Bd6 12.Nxd6+ Qxd6 13.Bg2 O-O 14.O-O a5 
15.Rd1 Qe7 16.h3 Rxd1+ 17.Qxd1 Rd8 18.Qb3 Be6 19.Qc2 Ng6 20.Be3 Rd7 21.Rd1
Qb4 22.Rxd7 Nxd7 23.Ne4 Bb3 24.Qd2 Qxd2 25.Bxd2 b6 26.Nc3 Ne7 27.Kf1 Nd5 
28.Bxd5 cxd5 29.Bf4 Nc5 30.Bc7 d4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "4"]
[White "Karpov, Anatoly"]
[Black "Miles, Anthony John"]
[WhiteElo "2690"]
[BlackElo "2590"]
[Result "1-0"]
[ECO "B14"]
[EventDate "1981.05.24"]
[PlyCount "81"]

1.e4 c6 2.c4 d5 3.cxd5 cxd5 4.exd5 Nf6 5.Nc3 Nxd5 6.d4 g6 7.Bb5+ Nc6 8.Qa4
Nxc3 9.bxc3 Bg7 10.Nf3 O-O 11.O-O Be6 12.Bxc6 bxc6 13.Ba3 Qc7 14.Rfe1 Rfe8
15.Ne5 Rab8 16.c4 Rb6 17.Bc5 Rb2 18.Qxc6 Rc8 19.Qa4 Qb7 20.Rad1 Bxe5 21.
Rxe5 Qc6 22.Qxa7 Rb7 23.Qa3 Bxc4 24.Bxe7 Bd5 25.Rde1 Kg7 26.Qe3 Rcb8 27.h4
Rb1 28.Rxb1 Rxb1+ 29.Kh2 h6 30.f3 Bxa2 31.Bc5 Rb8 32.d5 Qf6 33.Rh5 Kg8 34.
Bd4 Qd6+ 35.Be5 Re8 36.Qxh6 Qxe5+ 37.Rxe5 Rxe5 38.d6 Be6 39.Qd2 Bd7 40.Qd4
Re6 41.Qa7 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "4"]
[White "Polugaevsky, Lev"]
[Black "Ljubojevic, Ljubomir"]
[WhiteElo "2620"]
[BlackElo "2605"]
[Result "1/2-1/2"]
[ECO "E04"]
[EventDate "1981.05.24"]
[PlyCount "44"]

1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 dxc4 5.Bg2 c5 6.O-O cxd4 7.Nxd4 Bc5 8.Qa4+ 
Qd7 9.Nb5 O-O 10.Qxc4 Qe7 11.N5c3 a6 12.Bg5 Nbd7 13.Ne4 Ba7 14.Nbc3 h6 15.
Bd2 Rb8 16.Rac1 Rd8 17.Rfd1 b5 18.Qc7 Bb6 19.Qd6 Qxd6 20.Nxd6 Ne5 21.Nxc8 
Rdxc8 22.Be1 Ba5 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "4"]
[White "Portisch, Lajos"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2650"]
[BlackElo "2550"]
[Result "1-0"]
[ECO "A22"]
[EventDate "1981.05.24"]
[PlyCount "55"]

1.c4 e5 2.Nc3 Nf6 3.g3 Bb4 4.Nf3 Qe7 5.Bg2 c6 6.O-O O-O 7.d3 Bxc3 8.bxc3 
h6 9.e4 d6 10.Nh4 Na6 11.f4 exf4 12.Rxf4 Nc5 13.Be3 Nh7 14.Qd2 Ng5 15.Kh1 
Bd7 16.Raf1 Rae8 17.g4 Qd8 18.Nf5 Bxf5 19.gxf5 f6 20.Rg4 Kh7 21.Rg1 Rg8 
22.h4 Nf7 23.d4 Nd7 24.Bf3 Nh8 25.Qg2 Re7 26.Bxh6 Nb6 27.Bxg7 Rf7 28.Rg6 
1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "4"]
[White "Timman, Jan"]
[Black "Langeweg, Christian"]
[WhiteElo "2620"]
[BlackElo "2455"]
[Result "1-0"]
[ECO "B47"]
[EventDate "1981.05.24"]
[PlyCount "83"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6 6.g3 Qc7 7.Bg2 Nf6 8.O-O 
Be7 9.Re1 Nxd4 10.Qxd4 Bc5 11.Bf4 d6 12.Qd2 Ng4 13.Re2 Ne5 14.Na4 Ba7 15.
Rd1 Bd7 16.Nc3 Rd8 17.b3 Bb8 18.Re3 Bc6 19.Ne2 Ba7 20.Rc3 Ng4 21.Rf1 e5 
22.h3 Nf6 23.Bg5 Qa5 24.Bxf6 gxf6 25.a4 h5 26.h4 Bc5 27.Qd1 b5 28.axb5 
axb5 29.Rd3 b4 30.Kh2 Qa8 31.f3 Ke7 32.c3 Bb5 33.c4 Bc6 34.Qe1 Qa2 35.f4 
Qc2 36.Nc1 Ra8 37.Rd2 Qb1 38.fxe5 fxe5 39.Qe2 Rh6 40.Rb2 Qa1 41.Na2 Rxa2 
42.Rxa2 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "5"]
[White "Kavalek, Lubomir"]
[Black "Timman, Jan"]
[WhiteElo "2550"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "B08"]
[EventDate "1981.05.24"]
[PlyCount "29"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 O-O 6.O-O Bg4 7.Be3 Nc6 8.Qd2 e5
9.dxe5 dxe5 10.Rad1 Qc8 11.Qc1 Rd8 12.Rxd8+ Qxd8 13.Rd1 Qf8 14.h3 Bxf3 15.
Bxf3 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "5"]
[White "Langeweg, Christian"]
[Black "Hort, Vlastimil"]
[WhiteElo "2455"]
[BlackElo "2575"]
[Result "1/2-1/2"]
[ECO "D37"]
[EventDate "1981.05.24"]
[PlyCount "43"]

1.d4 Nf6 2.Nf3 e6 3.c4 d5 4.Nc3 Be7 5.Bf4 O-O 6.e3 b6 7.cxd5 exd5 8.Be2 
Be6 9.Ne5 Nfd7 10.O-O Nxe5 11.Bxe5 c6 12.Rc1 Nd7 13.Bg3 a5 14.Bd3 Re8 15.
Ne2 c5 16.Bb5 Qc8 17.Nf4 Rd8 18.dxc5 Nxc5 19.b3 Qb7 20.Qe2 Rac8 21.Nxe6 
fxe6 22.Qg4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "5"]
[White "Ljubojevic, Ljubomir"]
[Black "Portisch, Lajos"]
[WhiteElo "2605"]
[BlackElo "2650"]
[Result "1/2-1/2"]
[ECO "C45"]
[EventDate "1981.05.24"]
[PlyCount "39"]

1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nb3 Bb6 6.a4 a6 7.a5 Ba7 8.Nc3 d6
9.Be2 h6 10.O-O Nf6 11.Kh1 O-O 12.f4 Re8 13.Bf3 Be6 14.Ra4 Bd7 15.h3 Rb8 
16.Kh2 Ne7 17.Ra1 Ng6 18.g3 Bc6 19.Qd3 Nf8 20.Bd2 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "5"]
[White "Miles, Anthony John"]
[Black "Polugaevsky, Lev"]
[WhiteElo "2590"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "A07"]
[EventDate "1981.05.24"]
[PlyCount "45"]

1.g3 d5 2.Nf3 Nf6 3.Bg2 Bf5 4.O-O c6 5.d3 e6 6.Nbd2 h6 7.b3 Be7 8.Bb2 O-O 
9.Ne5 Nbd7 10.c4 Nxe5 11.Bxe5 a5 12.Qc2 Nd7 13.Bc3 Re8 14.a3 b5 15.cxb5 
cxb5 16.Qb2 Bf8 17.Rfc1 b4 18.axb4 axb4 19.Bd4 e5 20.Ba7 Nf6 21.Nf3 e4 22.
Ne5 Ng4 23.Nxg4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "5"]
[White "Ree, Hans"]
[Black "Karpov, Anatoly"]
[WhiteElo "2485"]
[BlackElo "2690"]
[Result "1/2-1/2"]
[ECO "E16"]
[EventDate "1981.05.24"]
[PlyCount "62"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb4+ 5.Bd2 Be7 6.Nc3 Bb7 7.Bg2 O-O 8.O-O 
Na6 9.Rc1 c5 10.Bf4 cxd4 11.Qxd4 d6 12.Qd2 Qc8 13.b3 Rd8 14.Rfd1 Nc5 15.
Qc2 Nce4 16.Na4 h6 17.Ne1 d5 18.cxd5 Bxd5 19.Qxc8 Raxc8 20.Rxc8 Rxc8 21.f3
Nc5 22.Nxc5 Bxc5+ 23.Kf1 Bb7 24.Nd3 Ba3 25.Bc1 Be7 26.f4 Ba6 27.Ne1 g5 28.
Be3 Ng4 29.Bg1 Bc5 30.Bf3 Nf6 31.Rc1 Bxg1 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "5"]
[White "Smyslov, Vassily"]
[Black "Donner, Jan"]
[WhiteElo "2545"]
[BlackElo "2475"]
[Result "1/2-1/2"]
[ECO "E03"]
[EventDate "1981.05.24"]
[PlyCount "111"]

1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4 c5 7.Nf3 a6 8.O-O 
b5 9.Qb3 Bb7 10.a4 Bd5 11.Qd1 cxd4 12.Nxd4 Bxg2 13.Kxg2 Bc5 14.b4 Bxd4 15.
Qxd4 bxa4 16.Rxa4 Qb6 17.Qxb6 Nxb6 18.Ra2 Nfd5 19.Bd2 Nc4 20.b5 O-O 21.
bxa6 Nxd2 22.Nxd2 Nb4 23.Ra4 Nxa6 24.Rc1 Rfb8 25.Rcc4 Nc7 26.Rxa8 Nxa8 27.
Ne4 Kf8 28.Ra4 Nb6 29.Ra7 Nc8 30.Rd7 Nb6 31.Rc7 Nd5 32.Ra7 Ne7 33.h4 h6 
34.g4 Rd8 35.Kg3 Nd5 36.Nc5 Kg8 37.e4 Nf6 38.f3 Rc8 39.Nd3 Rc3 40.Nf2 Kf8 
41.e5 Ne8 42.Ne4 Rc7 43.Ra8 Ke7 44.h5 f6 45.f4 fxe5 46.fxe5 Rc1 47.Kf3 Rc7
48.Ra6 Rc1 49.Ra8 Rf1+ 50.Ke2 Rc1 51.Rb8 Rc7 52.Kd3 Rc1 53.Nc3 Rg1 54.Rb7+
Kd8 55.Rb8+ Ke7 56.Rb7+ 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "6"]
[White "Donner, Jan"]
[Black "Langeweg, Christian"]
[WhiteElo "2475"]
[BlackElo "2455"]
[Result "1-0"]
[ECO "E12"]
[EventDate "1981.05.24"]
[PlyCount "85"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 c5 5.d5 Ba6 6.Qc2 exd5 7.cxd5 g6 8.Nc3 Bg7 
9.e4 Bxf1 10.Kxf1 d6 11.g3 O-O 12.Kg2 a6 13.Bf4 Qc7 14.h3 Nbd7 15.g4 Rfe8 
16.Rhe1 h5 17.g5 Nh7 18.Rad1 b5 19.b3 Nhf8 20.Bg3 Rac8 21.a4 Qa5 22.Nb1 
Qb6 23.Nbd2 Nh7 24.Re2 Qc7 25.Rde1 Nhf8 26.axb5 axb5 27.Qd3 c4 28.bxc4 
bxc4 29.Qc2 c3 30.Nb3 Qb6 31.Rd1 Rc4 32.Nc1 Qc7 33.Nb3 Qb6 34.Nc1 Qc7 35.
Nb3 Rb8 36.Nbd4 Rb2 37.Qd3 Rxe2 38.Nxe2 c2 39.Rc1 Bb2 40.Bxd6 Qc8 41.Nd2 
Rc7 42.Bxc7 Bxc1 43.Bf4 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "6"]
[White "Hort, Vlastimil"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2575"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "D59"]
[EventDate "1981.05.24"]
[PlyCount "36"]

1.d4 Nf6 2.Nf3 e6 3.c4 Bb4+ 4.Bd2 Be7 5.Nc3 d5 6.Bg5 O-O 7.e3 h6 8.Bh4 b6 
9.Rc1 Bb7 10.cxd5 Nxd5 11.Nxd5 Bxd5 12.Bxe7 Qxe7 13.a3 Rc8 14.Bc4 Bxc4 15.
Rxc4 Nd7 16.Rc6 Nb8 17.Rc4 Nd7 18.Rc6 Nb8 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "6"]
[White "Karpov, Anatoly"]
[Black "Polugaevsky, Lev"]
[WhiteElo "2690"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "E18"]
[EventDate "1981.05.24"]
[PlyCount "38"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 8.Bd2 f5 
9.Qc2 Bf6 10.Rad1 Nxc3 11.Bxc3 Be4 12.Qd2 d6 13.Ne1 Bxg2 14.Nxg2 Qe7 15.
Nf4 Nd7 16.d5 Bg5 17.dxe6 Bxf4 18.Qxf4 Qxe6 19.Rfe1 Nc5 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "6"]
[White "Portisch, Lajos"]
[Black "Miles, Anthony John"]
[WhiteElo "2650"]
[BlackElo "2590"]
[Result "1-0"]
[ECO "E41"]
[EventDate "1981.05.24"]
[PlyCount "65"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3+ 7.bxc3 d6 8.e4 e5
9.h3 Qa5 10.Bd2 Bd7 11.O-O h6 12.Ne1 cxd4 13.cxd4 Qa3 14.d5 Nd4 15.Bc1 Qa6
16.Be3 Ba4 17.Qd2 Rc8 18.Bxd4 exd4 19.Rb1 Rc5 20.Nf3 Nd7 21.Qb2 O-O 22.
Nxd4 Rb8 23.Nf5 f6 24.Be2 Ne5 25.Qa3 Kh7 26.Rb4 Ra5 27.Qg3 g6 28.Nd4 Rc5 
29.Qf4 Rc7 30.Rfb1 Rf7 31.c5 Qa5 32.c6 b6 33.Qe3 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "6"]
[White "Ree, Hans"]
[Black "Smyslov, Vassily"]
[WhiteElo "2485"]
[BlackElo "2545"]
[Result "1/2-1/2"]
[ECO "A29"]
[EventDate "1981.05.24"]
[PlyCount "95"]

1.c4 e5 2.Nc3 Nf6 3.Nf3 Nc6 4.g3 d5 5.cxd5 Nxd5 6.Bg2 Nb6 7.O-O Be7 8.a3 
Be6 9.b4 f6 10.d3 O-O 11.Bb2 Qd7 12.Rc1 Rfd8 13.Nd2 Bh3 14.Bxh3 Qxh3 15.
Nce4 a6 16.Nc5 Bxc5 17.Qb3+ Kh8 18.Rxc5 Qg4 19.f3 Qd7 20.f4 Nd4 21.Bxd4 
Qxd4+ 22.Kh1 exf4 23.Rxf4 Qe3 24.Qd1 Re8 25.Ne4 Rad8 26.Qf1 Nd5 27.Rf3 Qh6
28.g4 c6 29.Qg1 Qg6 30.h4 h5 31.g5 f5 32.Ng3 f4 33.Ne4 Rxe4 34.dxe4 Qxe4 
35.Qd1 Re8 36.Kg1 Qxe2 37.Qxe2 Rxe2 38.a4 Kh7 39.b5 axb5 40.axb5 Re6 41.
Ra3 Ne7 42.bxc6 bxc6 43.Kf2 Nd5 44.Ra4 Kg6 45.Rac4 Kf5 46.Rxc6 Rxc6 47.
Rxc6 Ne7 48.Rc7 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "6"]
[White "Timman, Jan"]
[Black "Ljubojevic, Ljubomir"]
[WhiteElo "2620"]
[BlackElo "2605"]
[Result "1/2-1/2"]
[ECO "E15"]
[EventDate "1981.05.24"]
[PlyCount "44"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Nbd2 Bb7 6.Bg2 c5 7.e4 cxd4 8.e5 Ng4 
9.O-O Qc7 10.Re1 h5 11.h3 Nh6 12.Nxd4 Bxg2 13.Kxg2 Nc6 14.Qf3 Rb8 15.Nb5 
Qb7 16.Ne4 Nf5 17.Qxf5 exf5 18.Ned6+ Bxd6 19.Nxd6+ Kd8 20.Nxb7+ Rxb7 21.
Bg5+ Kc8 22.Rad1 Re8 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "7"]
[White "Kavalek, Lubomir"]
[Black "Donner, Jan"]
[WhiteElo "2550"]
[BlackElo "2475"]
[Result "1-0"]
[ECO "D54"]
[EventDate "1981.05.24"]
[PlyCount "71"]

1.c4 e6 2.Nc3 d5 3.d4 Nf6 4.Bg5 Be7 5.e3 O-O 6.Rc1 Ne4 7.Bxe7 Qxe7 8.Nf3 
c6 9.Bd3 Nxc3 10.Rxc3 Nd7 11.Qc2 g6 12.O-O dxc4 13.Bxc4 e5 14.d5 c5 15.Rd1
Qd6 16.Nd2 f5 17.Bb5 a6 18.Bxd7 Bxd7 19.Rxc5 Rac8 20.Rxc8 Rxc8 21.Qb3 b5 
22.e4 Qc5 23.Nf3 Qd6 24.h3 Rc4 25.exf5 gxf5 26.Qe3 e4 27.Qg5+ Kf7 28.Qh5+ 
Kg8 29.Nd4 Qxd5 30.Nc2 Qc6 31.Qg5+ Kf7 32.Qd8 Bc8 33.Rd6 Qxd6 34.Qxd6 Rxc2
35.b4 Kg7 36.h4 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "7"]
[White "Langeweg, Christian"]
[Black "Ree, Hans"]
[WhiteElo "2455"]
[BlackElo "2485"]
[Result "1/2-1/2"]
[ECO "A48"]
[EventDate "1981.05.24"]
[PlyCount "25"]

1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.c3 h6 5.Bh4 d6 6.e3 O-O 7.Nbd2 Nc6 8.Bc4 e5 
9.dxe5 Nxe5 10.Nxe5 dxe5 11.e4 Qd6 12.O-O Be6 13.Qe2 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "7"]
[White "Ljubojevic, Ljubomir"]
[Black "Hort, Vlastimil"]
[WhiteElo "2605"]
[BlackElo "2575"]
[Result "1/2-1/2"]
[ECO "C42"]
[EventDate "1981.05.24"]
[PlyCount "35"]

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1 
Bf5 9.Nbd2 Nxd2 10.Qxd2 Bxd3 11.Qxd3 O-O 12.Bf4 a6 13.c3 Qd7 14.Re3 Rae8 
15.Rae1 Bd8 16.Rxe8 Rxe8 17.Rxe8+ Qxe8 18.Qf5 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "7"]
[White "Miles, Anthony John"]
[Black "Timman, Jan"]
[WhiteElo "2590"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "E12"]
[EventDate "1981.05.24"]
[PlyCount "88"]

1.Nf3 Nf6 2.d4 e6 3.c4 b6 4.a3 c5 5.e3 g6 6.Nc3 Bg7 7.e4 cxd4 8.Nxd4 O-O 
9.Bg5 h6 10.Bh4 d5 11.exd5 exd5 12.Be2 Bb7 13.O-O dxc4 14.Ndb5 Nbd7 15.Nd6
Bc6 16.Bxc4 Ne5 17.Be2 Qe7 18.f4 Neg4 19.Bxg4 Rad8 20.Nc8 Qe3+ 21.Bf2 Rxd1
22.Bxe3 Rxf1+ 23.Rxf1 Nxg4 24.Ne7+ Kh7 25.Nxc6 Nxe3 26.Re1 Nc4 27.Re7 a5 
28.Ne5 Bf6 29.Rb7 Nxe5 30.fxe5 Bxe5 31.Na4 Kg7 32.Nxb6 Bxb2 33.Nc4 Bd4+ 
34.Kf1 Rc8 35.Nd6 Rc1+ 36.Ke2 Kf6 37.Nxf7 h5 38.Nd8 Bc5 39.Rf7+ Ke5 40.
Nc6+ Ke6 41.Nd8+ Kd5 42.Rd7+ Ke4 43.Rc7 Rc3 44.Nb7 Re3+ 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "7"]
[White "Polugaevsky, Lev"]
[Black "Portisch, Lajos"]
[WhiteElo "2620"]
[BlackElo "2650"]
[Result "1/2-1/2"]
[ECO "E04"]
[EventDate "1981.05.24"]
[PlyCount "82"]

1.d4 Nf6 2.c4 e6 3.g3 d5 4.Nf3 dxc4 5.Bg2 a6 6.O-O Nc6 7.e3 Rb8 8.Nfd2 Na7
9.Nxc4 b5 10.Ne5 c5 11.Bc6+ Bd7 12.Nxd7 Nxd7 13.Bg2 Be7 14.a4 Nc8 15.axb5 
axb5 16.Qe2 O-O 17.Rd1 Qb6 18.Bd2 cxd4 19.exd4 Nf6 20.Be3 Qd8 21.d5 e5 22.
Nc3 Nd6 23.Ba7 Rb7 24.Qxe5 Nd7 25.Qf4 Nb6 26.Ra6 Nbc4 27.b3 Bg5 28.Qg4 f5 
29.Qe2 Re8 30.Qc2 Rxa7 31.Rxa7 Ne3 32.Qd3 Nxd1 33.Qxd1 Qf6 34.Ne2 Qb2 35.
Nd4 Bf6 36.Ne6 Rc8 37.Qh5 Qb1+ 38.Bf1 Qxb3 39.Rd7 Qxd5 40.Ng5 Bxg5 41.Qxg5
Qe5 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "7"]
[White "Smyslov, Vassily"]
[Black "Karpov, Anatoly"]
[WhiteElo "2545"]
[BlackElo "2690"]
[Result "1/2-1/2"]
[ECO "E15"]
[EventDate "1981.05.24"]
[PlyCount "25"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Nbd2 Bb7 6.Bg2 c5 7.O-O cxd4 8.Nxd4 
Bxg2 9.Kxg2 Qc8 10.e3 Be7 11.Qf3 Nc6 12.Nxc6 Qxc6 13.Qxc6 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "8"]
[White "Donner, Jan"]
[Black "Ljubojevic, Ljubomir"]
[WhiteElo "2475"]
[BlackElo "2605"]
[Result "0-1"]
[ECO "D35"]
[EventDate "1981.05.24"]
[PlyCount "58"]

1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.cxd5 exd5 5.Bg5 c6 6.e3 Bd6 7.Bd3 Nbd7 8.Qc2 
Nf8 9.Nf3 Ng6 10.h4 h6 11.Bxg6 hxg5 12.Bf5 g4 13.Ne5 Bxf5 14.Qxf5 Rh5 15.
Qd3 Qe7 16.f4 gxf3 17.Nxf3 Ne4 18.Ne2 O-O-O 19.g4 Rh6 20.Rf1 Rxh4 21.Nxh4 
Qxh4+ 22.Kd1 Nf2+ 23.Rxf2 Qxf2 24.Qf5+ Qxf5 25.gxf5 Rh8 26.Kd2 Kd7 27.Rg1 
Rh7 28.Kd3 Ke7 29.e4 Rh3+ 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "8"]
[White "Hort, Vlastimil"]
[Black "Miles, Anthony John"]
[WhiteElo "2575"]
[BlackElo "2590"]
[Result "1/2-1/2"]
[ECO "E59"]
[EventDate "1981.05.24"]
[PlyCount "59"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 c5 7.O-O Nc6 8.a3 Bxc3 
9.bxc3 dxc4 10.Bxc4 Qc7 11.Bd3 e5 12.Qc2 Re8 13.dxe5 Nxe5 14.Nxe5 Qxe5 15.
f3 Bd7 16.a4 Rad8 17.Ra3 Bc6 18.c4 Rd6 19.a5 Red8 20.Re1 h6 21.Bf1 Nh5 22.
Qc3 Qe7 23.Ra2 Qh4 24.Rf2 Rg6 25.Ree2 Re8 26.Rd2 f5 27.Qd3 Qg5 28.Rd1 Rge6
29.Qa3 Qe7 30.Rd3 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "8"]
[White "Karpov, Anatoly"]
[Black "Portisch, Lajos"]
[WhiteElo "2690"]
[BlackElo "2650"]
[Result "1/2-1/2"]
[ECO "E39"]
[EventDate "1981.05.24"]
[PlyCount "96"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O 6.a3 Bxc5 7.Nf3 Nc6 8.Bg5 
Nd4 9.Nxd4 Bxd4 10.e3 Qa5 11.exd4 Qxg5 12.Qd2 Qxd2+ 13.Kxd2 b6 14.f3 Ba6 
15.Rc1 Rac8 16.b3 Rfd8 17.Be2 Kf8 18.Rhe1 d6 19.Rc2 Nd7 20.Kc1 Nf6 21.Kb2 
Rd7 22.Rec1 Bb7 23.Nb5 a6 24.Nc3 Rdc7 25.Bd3 g6 26.b4 Ke7 27.Re1 Kd8 28.f4
Bc6 29.a4 Ra8 30.g3 a5 31.b5 Bb7 32.Nb1 Rac8 33.Nd2 Ke7 34.Nb3 Nd7 35.Bf1 
Bd5 36.Nd2 Ba8 37.Rc3 h5 38.h4 Bb7 39.Rce3 d5 40.Rc1 dxc4 41.Rxc4 Bd5 42.
Rxc7 Rxc7 43.Rc3 Rxc3 44.Kxc3 Nf6 45.Be2 Ne8 46.Nf1 Nf6 47.Nd2 Kd6 48.Bd1 
Ke7 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "8"]
[White "Ree, Hans"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2485"]
[BlackElo "2550"]
[Result "1/2-1/2"]
[ECO "E16"]
[EventDate "1981.05.24"]
[PlyCount "82"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb4+ 5.Bd2 a5 6.Bg2 Bb7 7.O-O O-O 8.Nc3 d6 
9.Qc2 Nbd7 10.Nb5 Bxd2 11.Nxd2 Bxg2 12.Kxg2 Qb8 13.Rad1 c6 14.Nc3 b5 15.
cxb5 cxb5 16.Qd3 b4 17.Nb5 a4 18.Rc1 Ra5 19.Nc7 Rc8 20.Nc4 Rh5 21.Na6 Qa8+
22.f3 Qxa6 23.Nb6 Qxb6 24.Rxc8+ Nf8 25.e4 g5 26.h3 Kg7 27.Rfc1 b3 28.axb3 
axb3 29.R8c3 g4 30.hxg4 Rg5 31.Rxb3 Qa7 32.Qe3 h6 33.Rc6 N8h7 34.Rxd6 Qc7 
35.Rbb6 h5 36.Rdc6 Qd8 37.Rb7 hxg4 38.f4 Rd5 39.Rc4 Rd7 40.Rxd7 Qxd7 41.
Rc2 Qb7 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "8"]
[White "Smyslov, Vassily"]
[Black "Langeweg, Christian"]
[WhiteElo "2545"]
[BlackElo "2455"]
[Result "1-0"]
[ECO "B82"]
[EventDate "1981.05.24"]
[PlyCount "75"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 d6 6.Be3 Nf6 7.f4 e5 8.Nde2 
Ng4 9.Bg1 exf4 10.Nxf4 Be7 11.Qd2 O-O 12.O-O-O Be6 13.Kb1 Qd7 14.Nfd5 Rfd8
15.Bb5 Bf8 16.h3 Nge5 17.Qg5 Kh8 18.Be3 Rdc8 19.Rhf1 Qd8 20.Qxd8 Nxd8 21.
Be2 Bd7 22.Bf4 Be8 23.Bb5 Bc6 24.Ne3 f6 25.Nf5 Ndf7 26.Rd4 g6 27.Ne3 Nd8 
28.Rdd1 Kg7 29.Ned5 Nd7 30.Bc1 Nf7 31.b3 Rab8 32.Bb2 Nfe5 33.a4 a6 34.Be2 
Kf7 35.g4 Kg7 36.a5 Rd8 37.Rf2 Rbc8 38.Rdf1 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "8"]
[White "Timman, Jan"]
[Black "Polugaevsky, Lev"]
[WhiteElo "2620"]
[BlackElo "2620"]
[Result "1-0"]
[ECO "B40"]
[EventDate "1981.05.24"]
[PlyCount "117"]

1.e4 c5 2.Nc3 Nc6 3.Nf3 e6 4.g3 Nf6 5.Bg2 d6 6.O-O Be7 7.d3 O-O 8.Bf4 Bd7 
9.h3 Nd4 10.Nxd4 cxd4 11.Ne2 e5 12.Bd2 Rc8 13.c3 dxc3 14.Bxc3 Bc6 15.f4 
Qb6+ 16.Kh2 Nd7 17.Qd2 Bf6 18.g4 Nc5 19.g5 Be7 20.Ng3 Qd8 21.h4 exf4 22.
Nf5 f6 23.Nxe7+ Qxe7 24.gxf6 Rxf6 25.Bxf6 Qxf6 26.Rxf4 Qd4 27.Rd1 Ne6 28.
Rf5 g6 29.Rf2 d5 30.exd5 Bxd5 31.Bxd5 Qxd5 32.Qe3 Ng7 33.d4 Nf5 34.Qe5 Qd7
35.Qf4 Re8 36.Rc1 Re7 37.Rc5 Rf7 38.Qe5 Qd8 39.Rf4 b6 40.Rc6 Rd7 41.Qe6+ 
Kg7 42.Qe5+ Kg8 43.Rg4 Ng7 44.Re4 Nf5 45.Re6 Kf7 46.Rf6+ Qxf6 47.Qe8+ Kg7 
48.Qxd7+ Kh6 49.Qe6 Qd8 50.d5 Qc7+ 51.Qe5 Qc2+ 52.Re2 Qc4 53.Qe4 Qc7+ 54.
Kg1 Qc1+ 55.Kg2 Qd1 56.Rf2 Kg7 57.Qe5+ Kg8 58.Kh2 Qd3 59.d6 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "9"]
[White "Kavalek, Lubomir"]
[Black "Smyslov, Vassily"]
[WhiteElo "2550"]
[BlackElo "2545"]
[Result "1/2-1/2"]
[ECO "C42"]
[EventDate "1981.05.24"]
[PlyCount "100"]

1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 Be7 6.Bd3 d5 7.O-O Nc6 8.Re1 
Bf5 9.Nbd2 Nxd2 10.Qxd2 Bxd3 11.Qxd3 O-O 12.c3 Qd7 13.Bf4 a6 14.Re3 Rae8 
15.Rae1 Bd8 16.Ne5 Nxe5 17.dxe5 Qb5 18.b3 Qxd3 19.Rxd3 c6 20.c4 Ba5 21.Rb1
dxc4 22.bxc4 Rd8 23.Ra3 Bb4 24.Rab3 Bd2 25.Bxd2 Rxd2 26.Rxb7 Rxa2 27.Rc7 
g5 28.g3 Re2 29.Rxc6 Rxe5 30.Rxa6 Rc8 31.Rc1 Rec5 32.Ra4 g4 33.f3 h5 34.
Kf2 Kg7 35.Rc2 Kg6 36.Ke3 gxf3 37.Kxf3 Rd8 38.Ra6+ f6 39.Re6 Kf5 40.Re3 
Rd4 41.Rec3 h4 42.Ke3 Ke5 43.Kf2 hxg3+ 44.Kxg3 f5 45.Kf3 Kf6 46.Ke3 Ke5 
47.h3 f4+ 48.Kf3 Kf5 49.h4 Kg6 50.Kg4 Kh6 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "9"]
[White "Langeweg, Christian"]
[Black "Karpov, Anatoly"]
[WhiteElo "2455"]
[BlackElo "2690"]
[Result "0-1"]
[ECO "E13"]
[EventDate "1981.05.24"]
[PlyCount "82"]

1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb4 5.Bg5 h6 6.Bh4 g5 7.Bg3 Ne4 8.Qc2 Bb7 
9.e3 Bxc3+ 10.bxc3 Nxg3 11.hxg3 Nc6 12.Nd2 Qe7 13.Qb2 g4 14.Nb3 Qg5 15.c5 
Rb8 16.Qa3 h5 17.Rh4 Ba8 18.Be2 f5 19.Rd1 Qe7 20.Qa4 Kf7 21.c4 a5 22.a3 
Ne5 23.d5 bxc5 24.Nc1 d6 25.Qxa5 exd5 26.cxd5 Ng6 27.Rh1 h4 28.gxh4 Nxh4 
29.Kf1 Ng6 30.Rg1 Rb6 31.Qa4 Bb7 32.Qc2 Qe5 33.Nd3 Qe4 34.Qc3 Ba6 35.Ke1 
Rh2 36.g3 Bxd3 37.Bxd3 Qf3 38.Qc2 Kf6 39.Rf1 Ne5 40.Be2 Qe4 41.Qc3 Kg6 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "9"]
[White "Ljubojevic, Ljubomir"]
[Black "Ree, Hans"]
[WhiteElo "2605"]
[BlackElo "2485"]
[Result "1/2-1/2"]
[ECO "E90"]
[EventDate "1981.05.24"]
[PlyCount "39"]

1.Nf3 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.d4 O-O 6.h3 e5 7.dxe5 dxe5 8.Qxd8 
Rxd8 9.Bg5 Na6 10.Nd5 Rd6 11.Bxf6 Bxf6 12.O-O-O Kg7 13.Rd2 Rd7 14.g4 c6 
15.Nxf6 Kxf6 16.g5+ Ke6 17.h4 Rxd2 18.Kxd2 Kd6 19.Rg1 c5 20.a3 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "9"]
[White "Miles, Anthony John"]
[Black "Donner, Jan"]
[WhiteElo "2590"]
[BlackElo "2475"]
[Result "1-0"]
[ECO "E81"]
[EventDate "1981.05.24"]
[PlyCount "127"]

1.c4 Nf6 2.Nc3 g6 3.d4 Bg7 4.e4 d6 5.f3 O-O 6.Bg5 c5 7.d5 e6 8.Qd2 exd5 9.
Nxd5 Be6 10.Ne2 Bxd5 11.cxd5 Nbd7 12.Nc3 a6 13.Be2 Qc7 14.O-O c4 15.Kh1 b5
16.b4 cxb3 17.axb3 Nb6 18.Rac1 Qb8 19.Na2 Nfd7 20.Nb4 Nc5 21.Nc6 Qb7 22.
Na5 Qd7 23.b4 Nca4 24.Rc6 Rfc8 25.Rfc1 Rxc6 26.dxc6 Qc7 27.Nb7 Bf8 28.Bf4 
Nc8 29.Bd1 Nab6 30.Bb3 Be7 31.Qb2 Bf8 32.Bg5 Bg7 33.Qa2 Na7 34.Qd2 Bf8 35.
Bf4 Nc4 36.Bxc4 bxc4 37.Rxc4 Nb5 38.Rc1 Rc8 39.h3 Qb6 40.Be3 Qc7 41.Qa2 
Ra8 42.Qf2 Be7 43.Bb6 Qc8 44.Qa2 Qe6 45.Qxe6 fxe6 46.c7 Rc8 47.Nd8 d5 48.
Nc6 Kf7 49.e5 Ke8 50.g3 Bf8 51.f4 d4 52.Nxd4 Nxd4 53.Bxd4 Bxb4 54.Bb6 Kd7 
55.Kg2 a5 56.Kf3 a4 57.Rc4 Be7 58.Rxa4 Kc6 59.Ba5 Kb5 60.Ra2 h5 61.Ke4 Bf8
62.Kf3 Be7 63.g4 hxg4+ 64.Kxg4 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "9"]
[White "Polugaevsky, Lev"]
[Black "Hort, Vlastimil"]
[WhiteElo "2620"]
[BlackElo "2575"]
[Result "1/2-1/2"]
[ECO "D18"]
[EventDate "1981.05.24"]
[PlyCount "39"]

1.d4 Nf6 2.c4 c6 3.Nc3 d5 4.Nf3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O 
Nbd7 9.Nh4 Bg6 10.Qb3 a5 11.f4 Nd5 12.Nxg6 hxg6 13.e4 Nc5 14.dxc5 Nxc3 15.
Bxe6 Ne2+ 16.Kf2 Nd4 17.Bxf7+ Kf8 18.Qc4 Rxh2 19.Bg8 Qe7 20.Kg1 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "9"]
[White "Portisch, Lajos"]
[Black "Timman, Jan"]
[WhiteElo "2650"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "A22"]
[EventDate "1981.05.24"]
[PlyCount "40"]

1.c4 e5 2.Nc3 Nf6 3.g3 Bb4 4.Nf3 e4 5.Nd4 Nc6 6.Nc2 Bxc3 7.dxc3 h6 8.Bg2 
d6 9.Ne3 O-O 10.O-O Re8 11.Qc2 Re5 12.Bd2 Ne7 13.f4 exf3 14.exf3 Nf5 15.
Ng4 Re8 16.Rae1 Be6 17.b3 a5 18.Rf2 h5 19.Nxf6+ Qxf6 20.Rfe2 a4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "10"]
[White "Donner, Jan"]
[Black "Polugaevsky, Lev"]
[WhiteElo "2475"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "E39"]
[EventDate "1981.05.24"]
[PlyCount "51"]

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O 6.a3 Bxc5 7.Nf3 Nc6 8.Bg5 
Nd4 9.Nxd4 Bxd4 10.e3 Qa5 11.exd4 Qxg5 12.g3 d6 13.Qd2 Qa5 14.Bg2 Qc7 15.
b3 Bd7 16.O-O Rac8 17.Rfc1 Rfe8 18.Ne4 Nxe4 19.Bxe4 Bc6 20.d5 exd5 21.Bxd5
Bxd5 22.Qxd5 Re5 23.Qd4 a5 24.Re1 h5 25.Rad1 a4 26.bxa4 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "10"]
[White "Hort, Vlastimil"]
[Black "Portisch, Lajos"]
[WhiteElo "2575"]
[BlackElo "2650"]
[Result "1/2-1/2"]
[ECO "C92"]
[EventDate "1981.05.24"]
[PlyCount "27"]

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 Bb7 10.d4 Re8 11.Ng5 Rf8 12.Nf3 Re8 13.Ng5 Rf8 14.Nf3 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "10"]
[White "Karpov, Anatoly"]
[Black "Timman, Jan"]
[WhiteElo "2690"]
[BlackElo "2620"]
[Result "1/2-1/2"]
[ECO "A15"]
[EventDate "1981.05.24"]
[PlyCount "64"]

1.Nf3 Nf6 2.c4 b6 3.g3 Bb7 4.Bg2 g6 5.d4 c5 6.O-O Bg7 7.Nc3 Ne4 8.Nxe4 
Bxe4 9.d5 O-O 10.Bh3 Bxf3 11.exf3 e5 12.f4 exf4 13.Bxf4 Bxb2 14.Rb1 Bf6 
15.Qa4 d6 16.Rb3 h5 17.Re1 g5 18.Rbe3 gxf4 19.Re8 b5 20.Qxb5 Qb6 21.Rxf8+ 
Kxf8 22.Re8+ Kg7 23.gxf4 Qxb5 24.cxb5 Bc3 25.Bf1 Ba5 26.Rc8 Kf6 27.Kg2 Ke7
28.Kf3 Bd8 29.a4 a6 30.bxa6 Kd7 31.Bh3+ Ke7 32.Bf1 Kd7 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "10"]
[White "Langeweg, Christian"]
[Black "Kavalek, Lubomir"]
[WhiteElo "2455"]
[BlackElo "2550"]
[Result "0-1"]
[ECO "E12"]
[EventDate "1981.05.24"]
[PlyCount "40"]

1.d4 Nf6 2.Nf3 e6 3.c4 b6 4.Nc3 Bb7 5.a3 g6 6.d5 exd5 7.cxd5 Bg7 8.g3 O-O 
9.Bg2 c5 10.O-O d6 11.h3 a6 12.a4 Nbd7 13.Nd2 Re8 14.Nc4 Ne5 15.Na3 Qb8 
16.f4 Ned7 17.Rb1 b5 18.axb5 axb5 19.Naxb5 Ba6 20.Na3 Bxe2 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "10"]
[White "Ree, Hans"]
[Black "Miles, Anthony John"]
[WhiteElo "2485"]
[BlackElo "2590"]
[Result "1-0"]
[ECO "A57"]
[EventDate "1981.05.24"]
[PlyCount "63"]

1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.e3 g6 6.Nc3 Bg7 7.d6 Bb7 8.Nf3 O-O 9.
bxa6 Nxa6 10.Bc4 Nb4 11.O-O e6 12.Qe2 Ne4 13.Nxe4 Bxe4 14.Nd2 Bb7 15.e4 
Qb6 16.Nb3 Qxd6 17.Be3 Na6 18.Rfd1 Qc7 19.Qd2 d6 20.Qxd6 Qxd6 21.Rxd6 Bxb2
22.Rad1 Kg7 23.Rb6 Rfb8 24.Rd7 Bd5 25.exd5 Rxb6 26.dxe6 Rf8 27.Ra7 Rd8 28.
g4 Rb4 29.Rxf7+ Kh8 30.e7 Rd1+ 31.Kg2 Nc7 32.Bh6 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "10"]
[White "Smyslov, Vassily"]
[Black "Ljubojevic, Ljubomir"]
[WhiteElo "2545"]
[BlackElo "2605"]
[Result "1/2-1/2"]
[ECO "D30"]
[EventDate "1981.05.24"]
[PlyCount "36"]

1.d4 Nf6 2.Nf3 e6 3.c4 d5 4.Bg5 c6 5.Nbd2 Nbd7 6.e3 Be7 7.Bd3 O-O 8.O-O b6
9.Qe2 Bb7 10.Rac1 c5 11.Rfd1 a6 12.Bb1 cxd4 13.Nxd4 Rc8 14.cxd5 Rxc1 15.
Rxc1 Nxd5 16.Bxe7 Qxe7 17.e4 Nf4 18.Qe3 Qd6 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "11"]
[White "Kavalek, Lubomir"]
[Black "Karpov, Anatoly"]
[WhiteElo "2550"]
[BlackElo "2690"]
[Result "1/2-1/2"]
[ECO "A07"]
[EventDate "1981.05.24"]
[PlyCount "33"]

1.Nf3 d5 2.g3 Nf6 3.Bg2 c6 4.b3 Bf5 5.Bb2 e6 6.O-O h6 7.c4 Be7 8.d3 O-O 9.
Nbd2 Nbd7 10.Ne5 Nxe5 11.Bxe5 Bd6 12.Bb2 Bh7 13.Nf3 Qe7 14.Rc1 e5 15.cxd5 
cxd5 16.d4 e4 17.Ne5 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "11"]
[White "Ljubojevic, Ljubomir"]
[Black "Langeweg, Christian"]
[WhiteElo "2605"]
[BlackElo "2455"]
[Result "1/2-1/2"]
[ECO "B44"]
[EventDate "1981.05.24"]
[PlyCount "46"]

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 Qa5 11.Be3 Rd8 12.Qb3 Nd7 13.Rac1 Nc5 14.Qd1 Rb8 15.
Qd2 Bd7 16.Rfd1 Be8 17.f3 Bf8 18.Bf1 Be7 19.Qf2 Nb4 20.Rd2 Rdc8 21.Nab1 
Nc6 22.Na3 Nb4 23.Nab1 Nc6 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "11"]
[White "Miles, Anthony John"]
[Black "Smyslov, Vassily"]
[WhiteElo "2590"]
[BlackElo "2545"]
[Result "1/2-1/2"]
[ECO "D13"]
[EventDate "1981.05.24"]
[PlyCount "23"]

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Nc3 Nc6 6.Bf4 a6 7.e3 Bg4 8.Be2 e6
9.O-O Bd6 10.Bxd6 Qxd6 11.Ne1 Bxe2 12.Qxe2 1/2-1/2

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "11"]
[White "Polugaevsky, Lev"]
[Black "Ree, Hans"]
[WhiteElo "2620"]
[BlackElo "2485"]
[Result "0-1"]
[ECO "E11"]
[EventDate "1981.05.24"]
[PlyCount "148"]

1.d4 e6 2.c4 Nf6 3.Nf3 Bb4+ 4.Bd2 Qe7 5.g3 O-O 6.Bg2 Bxd2+ 7.Qxd2 Ne4 8.
Qc2 f5 9.O-O d6 10.Nh4 g5 11.Nf3 Nd7 12.Ne1 Nef6 13.Nc3 Ng4 14.Nf3 Qg7 15.
e4 f4 16.Nb5 fxg3 17.hxg3 Nb8 18.e5 a6 19.Na3 dxe5 20.Qe4 h5 21.Nxe5 Nxe5 
22.Qxe5 Qxe5 23.dxe5 Nd7 24.f4 h4 25.Bh3 hxg3 26.Bxe6+ Kg7 27.Rad1 Nxe5 
28.Bxc8 gxf4 29.Bxb7 Rab8 30.Be4 Rxb2 31.Rd5 f3 32.Nc2 g2 33.Rxe5 gxf1=Q+ 
34.Kxf1 Rxa2 35.Kf2 Rf4 36.Bd3 Rxc4 37.Bxc4 Rxc2+ 38.Kxf3 Rxc4 39.Ra5 Rc6 
40.Ke4 Kf6 41.Kd5 Rd6+ 42.Kc5 Ke6 43.Ra1 Kd7 44.Rh1 Rc6+ 45.Kb4 Kc8 46.Ka5
Rb6 47.Rh5 Kb7 48.Rg5 Rb1 49.Rh5 Rd1 50.Kb4 Kb6 51.Rh6+ c6 52.Rh8 a5+ 53.
Kc4 Rc1+ 54.Kb3 Rg1 55.Rh5 Rd1 56.Kc4 Rc1+ 57.Kb3 Rc5 58.Rh8 Rg5 59.Kc4 
Rg4+ 60.Kb3 Kb5 61.Rh5+ c5 62.Rh8 a4+ 63.Ka3 Rg3+ 64.Kb2 Kb4 65.Rb8+ Kc4 
66.Ra8 Rg2+ 67.Ka3 Kc3 68.Rxa4 c4 69.Ra8 Rg7 70.Ka2 Kc2 71.Ka1 c3 72.Ka2 
Rb7 73.Ra6 Rd7 74.Ra8 Kd2 0-1

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "11"]
[White "Portisch, Lajos"]
[Black "Donner, Jan"]
[WhiteElo "2650"]
[BlackElo "2475"]
[Result "1-0"]
[ECO "E88"]
[EventDate "1981.05.24"]
[PlyCount "73"]

1.c4 Nf6 2.Nc3 g6 3.e4 d6 4.d4 Bg7 5.f3 O-O 6.Be3 e5 7.d5 c6 8.Bd3 cxd5 9.
cxd5 Ne8 10.Nge2 Bh6 11.Bf2 Nd7 12.O-O Nc5 13.Bc2 a5 14.a3 Bd7 15.b4 axb4 
16.axb4 Rxa1 17.Qxa1 Na6 18.Rb1 Nec7 19.Bb6 Qb8 20.Qa3 Rc8 21.Bd3 Bg5 22.
Kh1 Na8 23.Bg1 N8c7 24.Nc1 Ne8 25.N1a2 Nec7 26.Na4 Bb5 27.Nb6 Bxd3 28.Qxd3
Rd8 29.Nc3 Ne8 30.Nc4 Nac7 31.b5 Ng7 32.Ra1 Nce8 33.g3 f5 34.Ra7 Rd7 35.b6
Rf7 36.Na5 Nf6 37.Nxb7 1-0

[Event "21th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1981.05.??"]
[Round "11"]
[White "Timman, Jan"]
[Black "Hort, Vlastimil"]
[WhiteElo "2620"]
[BlackElo "2575"]
[Result "1/2-1/2"]
[ECO "D41"]
[EventDate "1981.05.24"]
[PlyCount "23"]

1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.
cxd4 Nc6 9.Bc4 Bb4+ 10.Bd2 Bxd2+ 11.Qxd2 O-O 12.O-O 1/2-1/2

