[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.21"]
[Round "1"]
[White "Dueckstein, Andreas"]
[Black "Enevoldsen, Jens"]
[Result "1-0"]
[ECO "B16"]
[EventDate "1964.07.21"]
[PlyCount "65"]

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ gxf6 6.Nf3 Bg4 7.Be2 e6 8.h3
Bh5 9.O-O Nd7 10.c4 Nb6 11.Qb3 Bxf3 12.Bxf3 Qxd4 13.Be3 Qd7 14.Bxb6 axb6 
15.Qxb6 Ra6 16.Qb3 Qc7 17.Rad1 Bc5 18.Rd2 Rb6 19.Qc3 Qe5 20.Rfd1 O-O 21.
Qc2 f5 22.a3 Ra8 23.Re2 Qf6 24.Rd7 Bd4 25.b4 Rxa3 26.Bh5 Ra1+ 27.Kh2 Be5+ 
28.g3 Rxb4 29.Rxe5 Qxe5 30.Qd2 f4 31.Qxb4 fxg3+ 32.Kg2 Qxh5 33.Rd8+ 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.21"]
[Round "1"]
[White "Kuijpers, Franciscus"]
[Black "Pirc, Vasja"]
[Result "0-1"]
[ECO "B09"]
[EventDate "1964.07.21"]
[PlyCount "66"]

1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.Be2 c5 7.d5 b5 8.e5 dxe5 9.
fxe5 Ng4 10.Bxb5 Nxe5 11.O-O Bg4 12.Be2 Nxf3+ 13.Bxf3 Bxf3 14.Qxf3 Nd7 15.
Bf4 Qb6 16.Rab1 Rae8 17.Qh3 e5 18.dxe6 Qxe6 19.Qxe6 Rxe6 20.Nd5 c4 21.Rfd1
Nb6 22.Bd6 Rd8 23.Ne7+ Kh8 24.Ba3 Re8 25.Re1 c3 26.Rxe6 fxe6 27.Nc6 Nc4 
28.Bb4 cxb2 29.Na5 Rb8 30.Nxc4 Rxb4 31.Nd2 Bc3 32.Nb3 Ra4 33.Kf2 Rxa2 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.21"]
[Round "1"]
[White "Larsen, Bent"]
[Black "Donner, Jan"]
[Result "1/2-1/2"]
[ECO "B40"]
[EventDate "1964.07.21"]
[PlyCount "95"]

1.e4 c5 2.Nf3 e6 3.Nc3 a6 4.g3 b5 5.Bg2 Bb7 6.O-O b4 7.Na4 Bxe4 8.d4 cxd4 
9.Qxd4 Nf6 10.Be3 Nc6 11.Qd2 Be7 12.Rfd1 d5 13.c4 O-O 14.Rac1 dxc4 15.Nb6 
Rb8 16.Qe1 Qc7 17.Nxc4 Qb7 18.Bg5 Bd5 19.Ne3 Rfd8 20.Nxd5 Nxd5 21.Qe4 Rbc8
22.Bf1 h6 23.Bxe7 Ncxe7 24.Bd3 g6 25.Rxc8 Qxc8 26.Ne5 a5 27.Qf3 Rf8 28.h4 
Qc7 29.Re1 Kg7 30.h5 g5 31.Ng4 Ng8 32.Re5 Qc1+ 33.Kg2 Qxb2 34.Rxd5 exd5 
35.Qf5 Re8 36.Nxh6 Nxh6 37.Qxg5+ Kf8 38.Qxh6+ Qg7 39.Qb6 Qe5 40.Qxa5 Qd4 
41.Qb5 Re6 42.Bf5 Rf6 43.g4 Kg7 44.Qb8 Rh6 45.Qh2 Rf6 46.Qg3 Kf8 47.Qb8+ 
Kg7 48.Qg3 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.21"]
[Round "1"]
[White "Lehmann, Heinz"]
[Black "Barcza, Gedeon"]
[Result "1-0"]
[ECO "E54"]
[EventDate "1964.07.21"]
[PlyCount "49"]

1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 e6 6.Nf3 Bb4 7.Bd3 dxc4 8.Bxc4 
O-O 9.O-O b6 10.Bg5 Bb7 11.Ne5 Nc6 12.Bxf6 gxf6 13.Nxc6 Bxc6 14.d5 Bxc3 
15.dxc6 Bxb2 16.Qg4+ Kh8 17.Rad1 Qc7 18.Bxe6 Rg8 19.Qh3 Rg7 20.Rd7 Qf4 21.
Rxf7 Rxf7 22.Bxf7 Qc7 23.Bg6 Be5 24.Rd1 Rg8 25.Rd7 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.21"]
[Round "1"]
[White "Van Geet, Dick Daniel"]
[Black "Van Scheltinga, Theodore"]
[Result "0-1"]
[ECO "A00"]
[EventDate "1964.07.21"]
[PlyCount "94"]

1.Nc3 d5 2.e4 dxe4 3.Nxe4 Nd7 4.Bc4 Ndf6 5.Ng5 e6 6.d4 Bd6 7.Qe2 Ne7 8.
N1f3 h6 9.Ne4 Nxe4 10.Qxe4 Bd7 11.Ne5 Bxe5 12.dxe5 Bc6 13.Qg4 Nf5 14.f3 
Qe7 15.Bd3 g6 16.Bd2 O-O-O 17.Qb4 Qh4+ 18.Qxh4 Nxh4 19.Rg1 g5 20.O-O-O 
Rhg8 21.Rdf1 a6 22.Rf2 Rd7 23.h3 Bd5 24.a3 c5 25.b4 c4 26.Be2 Ng6 27.f4 c3
28.Be3 gxf4 29.Bxf4 Nxf4 30.Rxf4 Rg5 31.Bd1 Rxe5 32.Rh4 Rg5 33.g4 Rg6 34.
Rg3 Rc7 35.Rh5 f5 36.Rd3 Be4 37.Re3 b5 38.Be2 Kb7 39.Bd3 Bxd3 40.cxd3 fxg4
41.hxg4 Rxg4 42.Rxe6 Rg1+ 43.Kc2 Rg2+ 44.Kc1 Rf7 45.Re1 Ra2 46.Kb1 Rff2 
47.Re7+ Kc8 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.22"]
[Round "2"]
[White "Donner, Jan"]
[Black "Barcza, Gedeon"]
[Result "1/2-1/2"]
[ECO "E54"]
[EventDate "1964.07.21"]
[PlyCount "78"]

1.d4 e6 2.c4 Bb4+ 3.Nc3 c5 4.e3 Nf6 5.Bd3 d5 6.Nf3 O-O 7.O-O cxd4 8.exd4 
dxc4 9.Bxc4 b6 10.Qe2 Bb7 11.Bg5 Nbd7 12.Rac1 Qb8 13.Rfe1 Bxc3 14.bxc3 h6 
15.Bh4 Qf4 16.Bg3 Qg4 17.Bd3 Nh5 18.Qe3 Nxg3 19.hxg3 Rfd8 20.Red1 Rac8 21.
a4 Qh5 22.Nd2 Nf6 23.f3 Rc7 24.Nb3 Nd5 25.Qe1 a5 26.c4 Nb4 27.c5 bxc5 28.
Nxa5 Nxd3 29.Rxd3 Ba6 30.Rdd1 Rdc8 31.dxc5 Rxc5 32.Nb3 Rc4 33.Qe3 Qf5 34.
Rxc4 Rxc4 35.g4 Qg5 36.Qxg5 hxg5 37.Rd8+ Kh7 38.Ra8 Bb7 39.Ra7 Bd5 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.22"]
[Round "2"]
[White "Enevoldsen, Jens"]
[Black "Van Geet, Dick Daniel"]
[Result "1/2-1/2"]
[ECO "A46"]
[EventDate "1964.07.21"]
[PlyCount "36"]

1.d4 Nf6 2.Nf3 c5 3.g3 g6 4.Bg2 Bg7 5.O-O O-O 6.c4 cxd4 7.Nxd4 d5 8.cxd5 
Nxd5 9.Nb5 a6 10.Qxd5 Qxd5 11.Bxd5 axb5 12.Nc3 b4 13.Ne4 Rd8 14.Bb3 Nc6 
15.Ng5 e6 16.Nf3 Na5 17.Bg5 f6 18.Be3 Bd7 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.22"]
[Round "2"]
[White "Larsen, Bent"]
[Black "Kuijpers, Franciscus"]
[Result "1-0"]
[ECO "A25"]
[EventDate "1964.07.21"]
[PlyCount "80"]

1.g3 e5 2.Bg2 Nc6 3.c4 g6 4.Nc3 Bg7 5.e3 d6 6.Nge2 Nge7 7.d4 O-O 8.d5 Nb8 
9.h4 h5 10.e4 Nd7 11.Bg5 Nf6 12.Qd2 a6 13.a4 Bd7 14.a5 Kh7 15.b4 Nfg8 16.
O-O Bh6 17.c5 f6 18.Bxh6 Nxh6 19.Rfb1 Qe8 20.b5 axb5 21.cxd6 cxd6 22.Qb2 
Qb8 23.Nxb5 Rc8 24.Nbc3 Rc7 25.a6 Qc8 26.Qb6 Nf7 27.a7 Qd8 28.f4 Nc8 29.
Qf2 b6 30.Nb5 Bxb5 31.Rxb5 Rcxa7 32.Rxa7 Rxa7 33.Bh3 Ra1+ 34.Kg2 Ra2 35.
Rb3 Qe8 36.Qf3 Nh6 37.Kf1 Ra1+ 38.Kf2 exf4 39.Qxf4 Ra4 40.Qxf6 Ng8 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.22"]
[Round "2"]
[White "Pirc, Vasja"]
[Black "Dueckstein, Andreas"]
[Result "1/2-1/2"]
[ECO "D02"]
[EventDate "1964.07.21"]
[PlyCount "60"]

1.Nf3 Nc6 2.d4 d5 3.g3 Bg4 4.Bg2 e6 5.O-O Nf6 6.b3 g6 7.Bb2 Bxf3 8.Bxf3 
Bg7 9.Nd2 h5 10.e4 dxe4 11.Nxe4 Nxe4 12.Bxe4 Nxd4 13.Bxb7 Rb8 14.Bg2 O-O 
15.Qd3 Nf3+ 16.Qxf3 Bxb2 17.Rad1 Qe7 18.a4 Qc5 19.Qc6 Qxc6 20.Bxc6 Rfd8 
21.Kg2 Kf8 22.f4 Ke7 23.Kf3 Rd6 24.Bb5 Rbd8 25.Rd3 Rxd3+ 26.Bxd3 c5 27.Rd1
e5 28.fxe5 Bxe5 29.Be2 Rxd1 30.Bxd1 h4 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.22"]
[Round "2"]
[White "Van Scheltinga, Theodore"]
[Black "Lehmann, Heinz"]
[Result "1/2-1/2"]
[ECO "A09"]
[EventDate "1964.07.21"]
[PlyCount "77"]

1.Nf3 d5 2.c4 dxc4 3.e3 Nf6 4.Bxc4 e6 5.b3 Be7 6.Bb2 O-O 7.O-O c5 8.d4 Nc6
9.Nbd2 Qa5 10.dxc5 Rd8 11.Qc1 Bd7 12.e4 Qxc5 13.e5 Nd5 14.Ne4 Qa5 15.Bxd5 
Qxd5 16.Qf4 Be8 17.Nf6+ gxf6 18.exf6 Bf8 19.Qg3+ Kh8 20.Ba3 Rd6 21.Rac1 e5
22.Rc4 Bd7 23.Bxd6 Qxd6 24.Qg5 Re8 25.Rh4 Qd3 26.Qh5 Qg6 27.Qxg6 fxg6 28.
Ng5 h5 29.h3 Nd4 30.Rd1 Bc6 31.Kh1 Nf5 32.Rc4 Bh6 33.Nf7+ Kg8 34.Nd8 Rxd8 
35.Rxd8+ Kf7 36.Ra8 a6 37.Rxc6 bxc6 38.Rxa6 Nd4 39.b4 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.23"]
[Round "3"]
[White "Barcza, Gedeon"]
[Black "Van Scheltinga, Theodore"]
[Result "1-0"]
[ECO "A30"]
[EventDate "1964.07.21"]
[PlyCount "97"]

1.Nf3 Nf6 2.g3 b6 3.Bg2 Bb7 4.O-O c5 5.c4 e6 6.Nc3 Be7 7.d4 cxd4 8.Qxd4 
Nc6 9.Qf4 Qb8 10.b3 Qxf4 11.Bxf4 O-O 12.Rfd1 Rfd8 13.Nb5 d5 14.Nc7 Rac8 
15.cxd5 Nxd5 16.Nxd5 exd5 17.Bh3 Ra8 18.Bc7 Rf8 19.Rxd5 Bf6 20.Rc1 Nb4 21.
Rd2 Nd5 22.Be5 Rfe8 23.Bxf6 Nxf6 24.Nd4 g6 25.Bg2 Bxg2 26.Kxg2 Ne4 27.Rdc2
Rad8 28.Nb5 Rd7 29.Nc7 Ree7 30.Na6 Re5 31.Nb8 Rb7 32.Nc6 Rd5 33.Nb4 Rdd7 
34.Nd3 Kg7 35.f3 Nd6 36.Kf2 Nb5 37.Ne5 Rd5 38.Nc4 Re7 39.e4 Rdd7 40.Rd2 
Rc7 41.Rcc2 Rc5 42.Ne3 Rh5 43.h4 Na3 44.Rc8 Ra5 45.Rdd8 f5 46.Nd5 Rb7 47.
e5 Nb5 48.e6 Rxa2+ 49.Ke3 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.23"]
[Round "3"]
[White "Dueckstein, Andreas"]
[Black "Larsen, Bent"]
[Result "0-1"]
[ECO "B45"]
[EventDate "1964.07.21"]
[PlyCount "70"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 d6 5.Nc3 e6 6.g3 Nxd4 7.Qxd4 Ne7 8.Be3 
Nc6 9.Qd2 Be7 10.f4 O-O 11.Bg2 Rb8 12.a4 a6 13.O-O Qc7 14.g4 Bd7 15.Ne2 
Rfc8 16.a5 Nd8 17.Rac1 d5 18.b4 Qc4 19.c3 Bb5 20.Nd4 dxe4 21.Bxe4 Nc6 22.
Rfd1 Nxd4 23.Bxd4 Ba4 24.Bd3 Qd5 25.Re1 Bxb4 26.Be4 Qxd4+ 27.Qxd4 Bc5 28.
Rb1 Bb5 29.Kf2 Kf8 30.Rec1 Ke7 31.Ke3 Bxd4+ 32.cxd4 Rxc1 33.Rxc1 Kd6 34.
Bxh7 g6 35.f5 gxf5 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.23"]
[Round "3"]
[White "Kuijpers, Franciscus"]
[Black "Donner, Jan"]
[Result "1-0"]
[ECO "B41"]
[EventDate "1964.07.21"]
[PlyCount "95"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nd2 d6 6.Bd3 Nf6 7.O-O Be7 8.Kh1 e5
9.Ne2 O-O 10.f4 Nc6 11.Nf3 Bg4 12.Qe1 Qc7 13.Qg3 Bxf3 14.Qxf3 Rad8 15.Ng3 
g6 16.f5 Nd4 17.Qd1 d5 18.fxg6 hxg6 19.exd5 Rxd5 20.Bg5 Rd6 21.c3 Nc6 22.
Qe2 Kg7 23.Rf2 Qd7 24.Bf5 Qd8 25.Raf1 Nh7 26.Be3 gxf5 27.Nxf5+ Kh8 28.Nxd6
Qxd6 29.Rf5 Qg6 30.Qf3 f6 31.Qd5 Rd8 32.Qc4 Rg8 33.Qe2 Bf8 34.R5f2 Bg7 35.
Qc4 Rd8 36.Bb6 Rd7 37.Qe6 Nf8 38.Qh3+ Kg8 39.Bc5 Qd3 40.Qg4 Qg6 41.Qc4+ 
Qf7 42.Qg4 Ne6 43.Rxf6 Qxf6 44.Rxf6 Nxc5 45.Rf1 Re7 46.h4 e4 47.h5 Kh8 48.
Qc8+ 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.23"]
[Round "3"]
[White "Lehmann, Heinz"]
[Black "Enevoldsen, Jens"]
[Result "1/2-1/2"]
[ECO "A20"]
[EventDate "1964.07.21"]
[PlyCount "113"]

1.c4 Nf6 2.g3 e5 3.Bg2 d6 4.Nc3 g6 5.Nf3 c5 6.O-O Bg7 7.e3 O-O 8.d4 Nc6 9.
h3 Qe7 10.d5 Nd8 11.e4 a6 12.Re1 Kh8 13.a3 Ng8 14.b4 b6 15.bxc5 bxc5 16.
Rb1 f5 17.Na4 fxe4 18.Ng5 e3 19.Bxe3 Bf5 20.Rb6 Bh6 21.h4 Bxg5 22.Bxg5 Qc7
23.Qb3 Nf7 24.Bd2 Nf6 25.Rc6 Rab8 26.Qc3 Qd8 27.Rxa6 Ra8 28.Rxa8 Qxa8 29.
Nb2 Rb8 30.Nd3 Kg8 31.Nf4 Qa4 32.Ne6 Rb3 33.Qc1 Qxa3 34.Bg5 Qxc1 35.Rxc1 
Nd7 36.Kh2 Nxg5 37.hxg5 Rb1 38.Rc3 Nf8 39.Nc7 Rb2 40.Nb5 Rxf2 41.Nxd6 Nd7 
42.Ra3 Bg4 43.Ra8+ Kg7 44.Kg1 Rb2 45.Re8 Rb1+ 46.Kh2 Rb6 47.Re7+ Kf8 48.
Re8+ Kg7 49.Nb5 Kf7 50.Rc8 Be2 51.Rc6 Ke7 52.Na7 Rb2 53.d6+ Ke6 54.Kg1 Bg4
55.Nb5 Rb1+ 56.Kh2 Rb2 57.Kg1 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.23"]
[Round "3"]
[White "Van Geet, Dick Daniel"]
[Black "Pirc, Vasja"]
[Result "0-1"]
[ECO "A00"]
[EventDate "1964.07.21"]
[PlyCount "112"]

1.Nc3 d5 2.e4 d4 3.Nce2 e5 4.Ng3 Be6 5.c3 c5 6.Bb5+ Nd7 7.Qh5 Bd6 8.Nf5 
Bxf5 9.Qxf5 Ne7 10.Qg4 Ng6 11.h4 a6 12.h5 axb5 13.hxg6 Nf6 14.Qe2 fxg6 15.
Qxb5+ Qd7 16.Qxd7+ Kxd7 17.d3 dxc3 18.bxc3 c4 19.Bg5 cxd3 20.Bxf6 gxf6 21.
Rh3 Ra4 22.Re3 Kc6 23.Rd1 Bc5 24.Rexd3 Rxe4+ 25.Ne2 Ra8 26.R1d2 Rea4 27.
Rd7 Rxa2 28.Rxa2 Rxa2 29.Rxh7 Ra1+ 30.Kd2 Bxf2 31.Rh6 Kd5 32.Rxg6 Bh4 33.
c4+ Kc5 34.Nc1 Bg5+ 35.Rxg5 Rxc1 36.Rg6 Rxc4 37.Rxf6 Rg4 38.Rf2 Kd4 39.Ke1
b5 40.Rd2+ Kc3 41.Rd5 b4 42.Rc5+ Kd4 43.Rb5 Kc4 44.Rxe5 Rxg2 45.Kd1 Kc3 
46.Rc5+ Kb2 47.Rc6 b3 48.Rb6 Ka2 49.Ra6+ Kb1 50.Rb6 b2 51.Ra6 Rg5 52.Kd2 
Rd5+ 53.Ke2 Kc2 54.Rc6+ Kb3 55.Rb6+ Kc3 56.Rb8 Rd4 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.24"]
[Round "4"]
[White "Donner, Jan"]
[Black "Van Scheltinga, Theodore"]
[Result "1/2-1/2"]
[ECO "D26"]
[EventDate "1964.07.21"]
[PlyCount "81"]

1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O Nc6 7.Qe2 cxd4 8.Rd1 
Be7 9.exd4 O-O 10.Nc3 Na5 11.Bd3 b6 12.Bg5 Bb7 13.Rac1 Nd5 14.Qe4 g6 15.
Qh4 f6 16.Bh6 Rf7 17.Qh3 Nxc3 18.bxc3 Ba3 19.Rc2 Qd7 20.Re1 Re8 21.Rce2 
Bd5 22.Nd2 b5 23.Ne4 Nc4 24.Qh4 Be7 25.Qg3 f5 26.Nd2 Nxd2 27.Rxd2 Rc8 28.
Rc2 a6 29.h4 Qd8 30.Bg5 Bxg5 31.hxg5 Qc7 32.Qe3 Qa5 33.Qd2 Rfc7 34.Rec1 
Qa3 35.f3 Qd6 36.f4 Qf8 37.Qe3 Qa3 38.Qd2 Kf7 39.Kf2 Kg8 40.Kg1 Qd6 41.Qe3
1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.24"]
[Round "4"]
[White "Enevoldsen, Jens"]
[Black "Barcza, Gedeon"]
[Result "1-0"]
[ECO "B41"]
[EventDate "1964.07.21"]
[PlyCount "107"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 Nf6 6.Nc3 Qc7 7.Be2 Bb4 8.O-O 
Bxc3 9.bxc3 Nxe4 10.Bd3 Nc5 11.Bc2 d6 12.f4 f5 13.Ba3 O-O 14.Qe2 Rf6 15.
Rad1 Nbd7 16.Nb3 b5 17.Qd2 Nxb3 18.axb3 bxc4 19.Qxd6 Qb6+ 20.Rf2 cxb3 21.
Qxb6 Nxb6 22.Rd8+ Kf7 23.Bxb3 Bd7 24.Rxa8 Nxa8 25.Rd2 Ke8 26.Rd6 Nc7 27.c4
Rf7 28.Rb6 Kd8 29.Rb8+ Bc8 30.Ba4 e5 31.fxe5 Ne6 32.Bb4 Kc7 33.Bd6+ Kd8 
34.Bc6 Nf4 35.g3 Ng6 36.e6 Rc7 37.Bd7 Rxc4 38.Bxc8 Rxc8 39.e7+ Nxe7 40.
Bxe7+ Kd7 41.Rxc8 Kxc8 42.Kf2 Kd7 43.Bf8 g6 44.Ke3 Ke6 45.Kd4 g5 46.Bb4 
Kf6 47.Bc3 Ke6 48.Bd2 h6 49.Bb4 h5 50.Bd2 Kf6 51.Kd5 Kg6 52.Ke5 g4 53.Ba5 
h4 54.Bd8 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.24"]
[Round "4"]
[White "Kuijpers, Franciscus"]
[Black "Dueckstein, Andreas"]
[Result "0-1"]
[ECO "C17"]
[EventDate "1964.07.21"]
[PlyCount "100"]

1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Ba5 6.dxc5 Bxc3+ 7.bxc3 Ne7 8.Nf3 
Nd7 9.Bd3 Qc7 10.O-O Nxc5 11.Re1 Bd7 12.Bf1 Na4 13.Nd4 a6 14.Qg4 Ng6 15.
Bd2 O-O 16.Qh5 f5 17.Re3 Rf7 18.Nf3 Nf8 19.Ng5 Re7 20.Qh4 Be8 21.Qd4 b5 
22.c4 dxc4 23.Bb4 Rd7 24.Qh4 Nc5 25.f4 h6 26.Nh3 a5 27.Be1 Ne4 28.Nf2 Ng6 
29.Qh3 Nxf2 30.Bxf2 Nxf4 31.Qf3 Nd5 32.Ree1 Rb8 33.c3 Ne7 34.Qe2 Rd5 35.a4
Rc8 36.axb5 Bxb5 37.Qa2 a4 38.Rab1 Kh7 39.Rb2 Ng6 40.Bd4 Nf4 41.Qb1 Qd7 
42.Qd1 Nd3 43.Bxd3 cxd3 44.Ra2 Ra8 45.g4 Rxd4 46.cxd4 Qxd4+ 47.Rf2 a3 48.
h3 fxg4 49.Qxg4 d2 50.Rd1 Qxg4+ 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.24"]
[Round "4"]
[White "Larsen, Bent"]
[Black "Van Geet, Dick Daniel"]
[Result "1-0"]
[ECO "A03"]
[EventDate "1964.07.21"]
[PlyCount "101"]

1.f4 d5 2.Nf3 Bg4 3.e3 Nc6 4.Bb5 Qd6 5.O-O a6 6.Be2 Nf6 7.d4 Ne4 8.c4 e6 
9.Nc3 Rd8 10.c5 Qd7 11.Nxe4 dxe4 12.Ne5 Bxe2 13.Qxe2 Qd5 14.Bd2 f6 15.Nxc6
Qxc6 16.b4 Be7 17.Rfc1 O-O 18.a4 Ra8 19.Qc4 Qd5 20.Qxd5 exd5 21.f5 c6 22.
Be1 g6 23.Bg3 Kf7 24.Rf1 g5 25.b5 axb5 26.axb5 cxb5 27.Rab1 Ra5 28.Bc7 Ra3
29.Rxb5 Rxe3 30.Rxb7 Rc3 31.Bd6 Re8 32.Ra1 e3 33.Kf1 Kf8 34.Rxe7 Rxe7 35.
Ke2 Rc2+ 36.Kd3 Rd2+ 37.Kc3 Kf7 38.Bxe7 Kxe7 39.Re1 Rxg2 40.Rxe3+ Kd7 41.
Re6 Rxh2 42.Rxf6 g4 43.Rd6+ Kc7 44.Rxd5 Rh5 45.Re5 Kd7 46.Re4 Rg5 47.f6 h5
48.Re7+ Kd8 49.c6 g3 50.c7+ Kc8 51.f7 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.24"]
[Round "4"]
[White "Pirc, Vasja"]
[Black "Lehmann, Heinz"]
[Result "0-1"]
[ECO "E69"]
[EventDate "1964.07.21"]
[PlyCount "76"]

1.c4 Nf6 2.g3 g6 3.Bg2 Bg7 4.Nc3 O-O 5.Nf3 d6 6.d4 Nbd7 7.O-O e5 8.e4 c6 
9.h3 a6 10.Re1 Re8 11.b3 b5 12.cxb5 axb5 13.d5 cxd5 14.Nxd5 Bb7 15.Bg5 Qb8
16.Nxf6+ Nxf6 17.Bxf6 Bxf6 18.a4 d5 19.exd5 e4 20.Nd4 bxa4 21.Rxa4 Bxd5 
22.Rxa8 Bxa8 23.Nc2 Qxb3 24.Ne3 Qb4 25.Qb1 Qc5 26.Rc1 Qa7 27.Qc2 Bd4 28.
Re1 Kg7 29.Qd2 Rc8 30.Rd1 Bxe3 31.Qxe3 Qxe3 32.fxe3 Rc3 33.Re1 f5 34.Kf2 
Bd5 35.Re2 g5 36.Rd2 Be6 37.Rb2 Kf6 38.Rb5 Rc2+ 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.25"]
[Round "5"]
[White "Barcza, Gedeon"]
[Black "Pirc, Vasja"]
[Result "1/2-1/2"]
[ECO "A34"]
[EventDate "1964.07.21"]
[PlyCount "61"]

1.Nf3 c5 2.c4 g6 3.Nc3 Bg7 4.e3 Nf6 5.d4 cxd4 6.exd4 d5 7.Be2 O-O 8.O-O 
Nc6 9.Bf4 dxc4 10.d5 Na5 11.Be5 a6 12.Qd4 b5 13.Rfd1 Nb7 14.a4 b4 15.Na2 
a5 16.Bxc4 Nd6 17.Bb3 Ba6 18.Re1 Nf5 19.Qd1 Qb6 20.Nd4 Nxd4 21.Qxd4 Qxd4 
22.Bxd4 Bb7 23.Rxe7 Bxd5 24.Bxd5 Nxd5 25.Bxg7 Kxg7 26.Re5 Rfd8 27.Nc1 Nb6 
28.Nb3 Nxa4 29.Rxa5 Rxa5 30.Nxa5 Nxb2 31.Nc6 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.25"]
[Round "5"]
[White "Dueckstein, Andreas"]
[Black "Donner, Jan"]
[Result "0-1"]
[ECO "B42"]
[EventDate "1964.07.21"]
[PlyCount "136"]

1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Bc5 6.Nb3 Ba7 7.O-O Nc6 8.N1d2 
Nge7 9.Qh5 Ng6 10.Kh1 d5 11.Nf3 Nb4 12.Bg5 f6 13.Bd2 Nxd3 14.cxd3 O-O 15.
Rac1 e5 16.Nh4 Nxh4 17.Qxh4 Be6 18.Qg3 Qd7 19.f4 dxe4 20.dxe4 exf4 21.Bxf4
Rac8 22.h3 Qa4 23.Bh6 Qd7 24.Rfd1 Qf7 25.Bf4 Rfe8 26.e5 f5 27.Rxc8 Rxc8 
28.Be3 Bxb3 29.axb3 Bxe3 30.Qxe3 Re8 31.Re1 Qe6 32.Qf3 b6 33.Qd3 a5 34.Qb5
h6 35.Kh2 Rd8 36.Qc4 Qxc4 37.bxc4 Rc8 38.b3 Rc5 39.g4 fxg4 40.hxg4 Kf7 41.
e6+ Ke7 42.Kg3 b5 43.cxb5 Rxb5 44.Re3 Rb6 45.Kf4 Rxe6 46.Rc3 Rf6+ 47.Ke5 
Rg6 48.Rc7+ Kd8 49.Rc4 Rg5+ 50.Ke6 Rb5 51.Kf7 Rxb3 52.Kxg7 Rb6 53.Kf7 Ra6 
54.Ra4 Kd7 55.Ra1 a4 56.Kg7 a3 57.Rd1+ Kc7 58.Rc1+ Kb7 59.Rb1+ Ka7 60.Ra1 
a2 61.Rxa2 Rxa2 62.Kxh6 Rh2+ 63.Kg6 Kb7 64.g5 Kc7 65.Kf7 Kd7 66.g6 Rf2+ 
67.Kg8 Ke7 68.g7 Rg2 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.25"]
[Round "5"]
[White "Lehmann, Heinz"]
[Black "Larsen, Bent"]
[Result "1/2-1/2"]
[ECO "B61"]
[EventDate "1964.07.21"]
[PlyCount "82"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 Bd7 7.Qd2 Rc8 8.Be2 
a6 9.Bxf6 gxf6 10.O-O e6 11.Kh1 Nxd4 12.Qxd4 Be7 13.f4 Qc7 14.f5 Qc5 15.
Qd3 O-O 16.Rf4 Kh8 17.Bh5 exf5 18.exf5 Bd8 19.Qh3 Ba5 20.Ne4 Qe5 21.Rh4 
Bxf5 22.Bg4 Bxe4 23.Bxc8 Qxb2 24.Rf1 Qb5 25.Rg1 Bg6 26.c4 Qc5 27.Bxb7 Re8 
28.Qf3 Kg7 29.Rf1 f5 30.Bd5 Re5 31.Rh3 Bd2 32.Qa3 f4 33.Qxa6 Re3 34.Rhf3 
Rxf3 35.gxf3 Bc3 36.Qb7 Qe3 37.Rg1 Bd4 38.Rf1 Qe2 39.Rc1 Qxa2 40.Qe7 Be3 
41.Rf1 Qa3 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.25"]
[Round "5"]
[White "Van Geet, Dick Daniel"]
[Black "Kuijpers, Franciscus"]
[Result "0-1"]
[ECO "A01"]
[EventDate "1964.07.21"]
[PlyCount "72"]

1.b3 c5 2.Bb2 Nc6 3.Nf3 Nf6 4.d4 e6 5.g3 cxd4 6.Nxd4 Bc5 7.Nxc6 bxc6 8.Bg2
O-O 9.O-O d5 10.Nc3 Ba6 11.Na4 Be7 12.Qd2 Rc8 13.Rfd1 c5 14.e3 Qc7 15.Qc1 
Bb5 16.c4 dxc4 17.Nc3 Ba6 18.e4 Nd7 19.f4 cxb3 20.axb3 Nb8 21.e5 c4 22.f5 
Bb7 23.f6 Bc5+ 24.Kh1 Bxg2+ 25.Kxg2 Qxe5 26.fxg7 Rfd8 27.Re1 Qc7 28.Ne4 
Be7 29.Qh6 Qb7 30.Bf6 Bxf6 31.Rxa7 Bxg7 32.Qe3 Qxb3 33.Qg5 Qb2+ 34.Kh3 Rd5
35.Qe7 Rf8 36.Ng5 Nc6 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.25"]
[Round "5"]
[White "Van Scheltinga, Theodore"]
[Black "Enevoldsen, Jens"]
[Result "1-0"]
[ECO "A99"]
[EventDate "1964.07.21"]
[PlyCount "98"]

1.Nf3 f5 2.d4 Nf6 3.g3 e6 4.Bg2 Be7 5.c4 d6 6.Nc3 O-O 7.O-O Qe8 8.b3 Nc6 
9.d5 Nd8 10.Nb5 Nxd5 11.Nxd6 cxd6 12.cxd5 e5 13.Ba3 Nf7 14.Rc1 Qb5 15.Nd2 
Qa5 16.Nc4 Qa6 17.Bb4 Bd7 18.Qd2 e4 19.f4 Rac8 20.g4 Nh6 21.g5 Nf7 22.Bh3 
Rfe8 23.Bc3 Nh8 24.Qd4 Bf8 25.Ne3 Rxc3 26.Rxc3 g6 27.Qd2 Bb5 28.Rc2 Qb6 
29.Kh1 Nf7 30.Nc4 Bxc4 31.Rxc4 Bg7 32.e3 Qd8 33.Qg2 Qa5 34.Rd1 b5 35.Rc6 
b4 36.Qe2 Qa3 37.Ra6 Qb2 38.Qxb2 Bxb2 39.Bf1 Rc8 40.Bc4 Rc7 41.Rc6 Rb7 42.
Ba6 Rb6 43.Rd2 Bc3 44.Rc2 Nd8 45.Rxb6 axb6 46.Kg2 Kf8 47.Kf2 h5 48.Ke2 Ke7
49.Bc8 Nf7 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.27"]
[Round "6"]
[White "Donner, Jan"]
[Black "Enevoldsen, Jens"]
[Result "1-0"]
[ECO "D13"]
[EventDate "1964.07.21"]
[PlyCount "145"]

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 Bf5 5.cxd5 cxd5 6.Qb3 Qb6 7.Nxd5 Nxd5 8.
Qxd5 Qb4+ 9.Nd2 e6 10.Qb3 Nc6 11.e3 Qxb3 12.axb3 Be7 13.Be2 O-O-O 14.O-O 
Kb8 15.Nf3 f6 16.Bd2 Bd6 17.Bc3 Bc7 18.b4 Ne7 19.Ra2 Rc8 20.Rfa1 Bb6 21.
Nd2 Nd5 22.Nc4 Rxc4 23.Bxc4 Nxc3 24.bxc3 Rc8 25.Bb3 Rxc3 26.Rb2 Kc7 27.h3 
Kd6 28.Rd1 g5 29.Ba2 h5 30.Bb1 Bxb1 31.Rbxb1 Kd7 32.Rdc1 Ra3 33.Rc2 f5 34.
Kf1 f4 35.exf4 gxf4 36.Rd1 Rb3 37.Rc4 f3 38.gxf3 Rxf3 39.Kg2 Rb3 40.d5 Rb2
41.dxe6+ Kxe6 42.Rf1 Kf5 43.Kg3 Kg5 44.f4+ Kf5 45.Rf3 h4+ 46.Kxh4 Rg2 47.
Rc8 Bd4 48.Rd3 Bf6+ 49.Kh5 Rg7 50.Rc5+ Kxf4 51.Rc4+ Kf5 52.Rf3+ Ke6 53.Rg4
Rh7+ 54.Kg6 Rg7+ 55.Kh6 Rf7 56.Rgf4 Rf8 57.Rf5 Rh8+ 58.Kg6 Rg8+ 59.Kh5 
Rh8+ 60.Kg4 Rh4+ 61.Kg3 Rh6 62.Rb5 Rh7 63.Re3+ Kd6 64.Re4 a6 65.Rf5 Rg7+ 
66.Kf3 Rg6 67.h4 Rh6 68.h5 b6 69.Rg4 Ke6 70.Ke4 Kf7 71.Kd5 a5 72.b5 Ke7 
73.Re4+ 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.27"]
[Round "6"]
[White "Dueckstein, Andreas"]
[Black "Van Geet, Dick Daniel"]
[Result "1-0"]
[ECO "B00"]
[EventDate "1964.07.21"]
[PlyCount "74"]

1.e4 Nc6 2.Nf3 d6 3.d4 Bg4 4.Bb5 a6 5.Ba4 b5 6.Bb3 e6 7.c3 Na5 8.Bc2 c5 9.
a4 b4 10.Nbd2 Qc7 11.O-O Ne7 12.h3 Bh5 13.cxb4 cxb4 14.Bd3 Qb6 15.Re1 Nec6
16.g4 Bg6 17.Nc4 Nxc4 18.Bxc4 Be7 19.a5 Nxa5 20.Qa4+ Qc6 21.Qxc6+ Nxc6 22.
d5 Ne5 23.Bb5+ Nd7 24.Bc6 Rc8 25.Rxa6 Kd8 26.Be3 Bxe4 27.Ng5 Bxg5 28.Bxg5+
f6 29.Bxd7 Kxd7 30.dxe6+ Ke8 31.Bxf6 d5 32.Bxg7 Rg8 33.Ra7 Bf3 34.Kh2 h5 
35.Kg3 hxg4 36.hxg4 Be4 37.f3 Bd3 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.27"]
[Round "6"]
[White "Kuijpers, Franciscus"]
[Black "Lehmann, Heinz"]
[Result "1/2-1/2"]
[ECO "B93"]
[EventDate "1964.07.21"]
[PlyCount "142"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4 Qc7 7.Bd3 g6 8.O-O Bg7
9.Kh1 O-O 10.Qe1 Nbd7 11.Nf3 e5 12.Qh4 b5 13.fxe5 dxe5 14.a3 Bb7 15.Bg5 
Nh5 16.Rae1 Nc5 17.Nd1 Rae8 18.Nc3 f6 19.Bc1 Nf4 20.Rd1 Rd8 21.Bxf4 exf4 
22.Ng1 Nxd3 23.cxd3 f5 24.Rc1 Qd7 25.Rxf4 Bf6 26.Qh6 Qxd3 27.exf5 Bg7 28.
Qh4 gxf5 29.Qh5 Qd2 30.Nce2 Rd6 31.Qh3 Rh6 32.Qb3+ Bd5 33.Qd1 Rg6 34.Rf2 
Qxd1 35.Rxd1 Bb3 36.Rd7 Rc6 37.Nd4 Bxd4 38.Rxd4 Rc1 39.h3 Be6 40.Rdf4 Rd8 
41.Kh2 Rd3 42.Nf3 Rc4 43.Rxc4 bxc4 44.Re2 Bd5 45.Ne5 Rd4 46.Kg3 Kg7 47.Nf3
Rd3 48.Re7+ Kg6 49.Ra7 Bxf3 50.gxf3 Rd6 51.Rc7 Rd4 52.Rc6+ Kg5 53.h4+ Rxh4
54.Rxa6 Rd4 55.Ra8 f4+ 56.Kh3 Rd3 57.Ra5+ Kg6 58.Kg4 Rb3 59.Ra6+ Kg7 60.
Ra4 Rxb2 61.Rxc4 Rg2+ 62.Kf5 h5 63.Rxf4 Kh6 64.Rb4 Rg5+ 65.Kf4 h4 66.Ke3 
Kh5 67.Kf2 Rc5 68.Rb2 Ra5 69.Rb3 Ra4 70.Ke3 Ra5 71.Kf4 Ra4+ 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.27"]
[Round "6"]
[White "Larsen, Bent"]
[Black "Barcza, Gedeon"]
[Result "1/2-1/2"]
[ECO "A03"]
[EventDate "1964.07.21"]
[PlyCount "121"]

1.f4 d5 2.Nf3 g6 3.c3 Bg7 4.d3 c5 5.g3 d4 6.Bg2 Nc6 7.Qb3 Nh6 8.Nbd2 O-O 
9.Ne4 b6 10.Nfg5 Na5 11.Qa3 Bb7 12.h4 c4 13.b4 cxb3 14.c4 Nf5 15.axb3 Nxg3
16.Nxg3 Bxg2 17.Rg1 Bb7 18.h5 Qd7 19.hxg6 hxg6 20.f5 Nc6 21.Bf4 e6 22.fxe6
fxe6 23.Bd6 Rfe8 24.O-O-O Ne7 25.Nf3 Nf5 26.Nxf5 exf5 27.Rxg6 Re6 28.Ne5 
Qxd6 29.Qxd6 Rxd6 30.Rxd6 Bxe5 31.Rg1+ Kf8 32.Re6 Bf4+ 33.Kd1 Kf7 34.Reg6 
Be5 35.R6g5 Ke6 36.Rg6+ Bf6 37.Rh6 Rf8 38.b4 Rf7 39.Rg8 f4 40.Kc2 Kd6 41.
Rg4 f3 42.exf3 Ke5 43.Rh5+ Ke6 44.Rf4 Bg7 45.Rxf7 Kxf7 46.b5 Kg6 47.Rh3 
Be5 48.Kd2 a5 49.bxa6 Bxa6 50.Rh1 Bd6 51.Ke2 Bb7 52.Rh8 Kg5 53.Rg8+ Kf5 
54.Rg4 Bc5 55.Rh4 Bc6 56.Rh5+ Kf4 57.Rh4+ Kg5 58.Rg4+ Kf5 59.Rh4 Bd7 60.
Rh7 Be8 61.Rh8 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.27"]
[Round "6"]
[White "Pirc, Vasja"]
[Black "Van Scheltinga, Theodore"]
[Result "1/2-1/2"]
[ECO "E08"]
[EventDate "1964.07.21"]
[PlyCount "61"]

1.Nf3 d5 2.g3 Nf6 3.Bg2 e6 4.O-O Be7 5.d4 O-O 6.c4 Nbd7 7.Qc2 c6 8.b3 Ne4 
9.Nbd2 f5 10.Ne1 Bf6 11.Bb2 Nxd2 12.Qxd2 dxc4 13.bxc4 c5 14.d5 Nb6 15.Rc1 
Bxb2 16.Qxb2 Qd6 17.Nd3 exd5 18.cxd5 Nd7 19.f3 Qxd5 20.f4 Qd4+ 21.Qxd4 
cxd4 22.Rc4 Nf6 23.Rxd4 Rb8 24.Rb1 b6 25.Ra4 Rf7 26.Ne5 Rc7 27.Nc6 Bd7 28.
Rxa7 Rxc6 29.Rxd7 Rc2 30.Rb7 Rxb7 31.Bxb7 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.28"]
[Round "7"]
[White "Barcza, Gedeon"]
[Black "Kuijpers, Franciscus"]
[Result "0-1"]
[ECO "A49"]
[EventDate "1964.07.21"]
[PlyCount "118"]

1.Nf3 Nf6 2.g3 g6 3.b3 Bg7 4.Bb2 O-O 5.Bg2 d6 6.d4 e5 7.dxe5 Ng4 8.h3 Nxe5
9.Nxe5 dxe5 10.Qxd8 Rxd8 11.Nd2 Nd7 12.O-O-O Rb8 13.a4 Re8 14.Nc4 h5 15.
Rd2 e4 16.Rhd1 Bxb2+ 17.Kxb2 Nf6 18.Na5 Bf5 19.e3 Kf8 20.b4 Ke7 21.Rd4 
Rec8 22.Rc4 c6 23.Nb3 b6 24.Nd4 Bd7 25.Ka3 c5 26.bxc5 bxc5 27.Nb5 Be6 28.
Rc3 a6 29.Nd6 Rd8 30.Rxc5 Rxd6 31.Rc7+ Rd7 32.Rdxd7+ Bxd7 33.Bf1 a5 34.Ra7
Rc8 35.Kb3 Rc5 36.Bb5 Rf5 37.Rxa5 Rxf2 38.Bxd7 Nxd7 39.Rb5 Re2 40.a5 Rxe3+
41.Kb2 Rf3 42.a6 Rf6 43.Ra5 Nb6 44.a7 e3 45.Kc3 Re6 46.Ra1 Kd7 47.Kd3 Kc7 
48.Ke2 Kb7 49.Ra5 Ka8 50.g4 hxg4 51.hxg4 Nc8 52.Rd5 Nd6 53.Ra5 f5 54.gxf5 
Nxf5 55.Ra1 Nd4+ 56.Kd3 e2 57.Re1 Nf3 58.Rxe2 Rxe2 59.Kxe2 Ne5 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.28"]
[Round "7"]
[White "Enevoldsen, Jens"]
[Black "Pirc, Vasja"]
[Result "1-0"]
[ECO "B23"]
[EventDate "1964.07.21"]
[PlyCount "51"]

1.e4 c5 2.f4 Nc6 3.Nc3 d6 4.Bb5 Bd7 5.Nf3 g6 6.O-O Bg7 7.Bxc6 Bxc6 8.Qe2 
e6 9.d3 Ne7 10.Bd2 O-O 11.Rae1 Qc7 12.h4 b5 13.h5 b4 14.Nd1 Rae8 15.hxg6 
fxg6 16.Ng5 Bd7 17.g4 Nc6 18.c3 Bf6 19.Nf3 Qa5 20.Qh2 bxc3 21.Bxc3 Qxa2 
22.Bxf6 Rxf6 23.e5 Rf7 24.Ng5 Rg7 25.Nc3 Qb3 26.Nce4 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.28"]
[Round "7"]
[White "Lehmann, Heinz"]
[Black "Dueckstein, Andreas"]
[Result "1/2-1/2"]
[ECO "A10"]
[EventDate "1964.07.21"]
[PlyCount "120"]

1.Nf3 e6 2.g3 f5 3.Bg2 Nf6 4.O-O Be7 5.c4 O-O 6.Nc3 d6 7.d3 e5 8.e4 Nc6 9.
Nd5 fxe4 10.dxe4 Bg4 11.Qd3 Qd7 12.Ne1 Nd4 13.f3 Nxd5 14.cxd5 Bh5 15.Be3 
c5 16.dxc6 Nxc6 17.Qd2 Bf7 18.Nd3 Rfd8 19.f4 exf4 20.Nxf4 Ne5 21.b3 Bf6 
22.Rac1 Qb5 23.Bh3 Re8 24.Nd5 Bxd5 25.exd5 Nd3 26.Rc4 Ne5 27.Rb4 Qa6 28.
Bf5 Re7 29.Qc2 Ng6 30.Bxg6 hxg6 31.Qxg6 Qe2 32.Re4 Bd4 33.Rxe7 Bxe3+ 34.
Rxe3 Qxe3+ 35.Kh1 Re8 36.Qf7+ Kh7 37.Rf4 Qc1+ 38.Kg2 Re2+ 39.Rf2 Rxf2+ 40.
Qxf2 Qg5 41.Qd4 Qf5 42.Qd2 a6 43.h4 Qe4+ 44.Kh2 b5 45.Qd1 g6 46.Qd2 Qf5 
47.a4 Qf3 48.axb5 axb5 49.b4 Qe4 50.Kg1 Qf3 51.Kh2 Qe4 52.Qa2 Kh6 53.Qb2 
Kh7 54.Qd2 Qf3 55.Qg2 Qg4 56.Qb2 Qe4 57.Qd2 Qf3 58.Qa2 Qe4 59.Qa7+ Kh6 60.
Qa1 Kh7 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.28"]
[Round "7"]
[White "Van Geet, Dick Daniel"]
[Black "Donner, Jan"]
[Result "0-1"]
[ECO "A00"]
[EventDate "1964.07.21"]
[PlyCount "68"]

1.Nc3 c5 2.g4 d5 3.Bg2 e6 4.d3 Nc6 5.Bf4 Nge7 6.Bg3 Ng6 7.Nf3 Bd6 8.Qd2 h5
9.gxh5 Rxh5 10.Nb5 Bb8 11.c4 d4 12.O-O-O a6 13.Na3 e5 14.e3 Kf8 15.exd4 
exd4 16.h4 Bg4 17.Rde1 Qf6 18.Ng5 Bf4 19.Bxf4 Qxf4 20.Be4 Nce5 21.Nb1 Re8 
22.Kc2 Bd7 23.Bxb7 f6 24.Ne4 Nf3 25.Qxf4 Nxe1+ 26.Rxe1 Nxf4 27.Rg1 a5 28.
Nbd2 a4 29.Nf3 Rb8 30.Ba6 Rb6 31.Bb5 Bxb5 32.cxb5 Rxb5 33.Rg4 Nd5 34.a3 f5
0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.28"]
[Round "7"]
[White "Van Scheltinga, Theodore"]
[Black "Larsen, Bent"]
[Result "1/2-1/2"]
[ECO "A56"]
[EventDate "1964.07.21"]
[PlyCount "102"]

1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 Nbd7 6.Bd3 g6 7.Nge2 a6 8.h3 h5 9.
O-O Bh6 10.Bxh6 Rxh6 11.Qd2 Rh8 12.a3 Kf8 13.b4 Kg7 14.Na4 b5 15.cxb5 axb5
16.Nac3 Ba6 17.Qe3 Rb8 18.a4 cxb4 19.axb5 Bb7 20.Na2 Qa5 21.Qd2 Ra8 22.
Qxb4 Nc5 23.Qxa5 Rxa5 24.Nb4 Rxa1 25.Rxa1 Nxd3 26.Nxd3 Nxe4 27.Nb4 Rc8 28.
Nc6 Ra8 29.Rxa8 Bxa8 30.f3 Nc5 31.Nc3 Kf8 32.Ne4 Nxe4 33.fxe4 Ke8 34.g4 
hxg4 35.hxg4 Kd7 36.g5 Kc7 37.Kf2 Bb7 38.Ke3 Bc8 39.b6+ Kxb6 40.Nd8 Kc5 
41.Nxf7 Bd7 42.Kd3 Be8 43.Nd8 Kb6 44.Ne6 Bf7 45.Kc4 Be8 46.Kc3 Bd7 47.Nf8 
Be8 48.Kb4 Ka6 49.Ne6 Kb6 50.Nf8 Ka6 51.Nh7 Kb6 1/2-1/2

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.29"]
[Round "8"]
[White "Donner, Jan"]
[Black "Pirc, Vasja"]
[Result "1-0"]
[ECO "A53"]
[EventDate "1964.07.21"]
[PlyCount "127"]

1.d4 Nf6 2.c4 d6 3.Nc3 c6 4.e4 e5 5.Nf3 Bg4 6.Be2 Nbd7 7.Be3 Be7 8.O-O O-O
9.Ne1 Bxe2 10.Qxe2 Re8 11.Nc2 Bf8 12.d5 c5 13.a3 Rc8 14.b4 cxb4 15.axb4 a6
16.Rfc1 Qc7 17.Na3 Nb6 18.f3 Nfd7 19.Nd1 Na8 20.Nb2 b6 21.Nd3 Rb8 22.Nb1 
Qb7 23.Qa2 Nc7 24.Nd2 Ra8 25.Rab1 Reb8 26.c5 bxc5 27.bxc5 Qa7 28.Rxb8 Rxb8
29.Nc4 dxc5 30.Ncxe5 Nxe5 31.Nxe5 Rb5 32.d6 Ne6 33.d7 Qc7 34.f4 Bd6 35.Rd1
Nd8 36.Qxa6 Rb6 37.Qa8 Bxe5 38.fxe5 Rb8 39.Qd5 c4 40.Rd4 Rb1+ 41.Kf2 Rb2+ 
42.Kf3 Qb6 43.e6 fxe6 44.Qxc4 Qa5 45.e5 Qxe5 46.Rg4 Rb7 47.Rd4 Rc7 48.Qd3 
Qf6+ 49.Kg3 h6 50.h3 Qe5+ 51.Bf4 Qe1+ 52.Kh2 Rb7 53.Bxh6 Rb1 54.Bd2 Qe5+ 
55.Bf4 Qe1 56.Qe3 Qh1+ 57.Kg3 Re1 58.Qf3 Ra1 59.Bd2 Qg1 60.Rc4 Qb6 61.Qd3 
Qb5 62.Qd4 Ra3+ 63.Kh2 e5 64.Qc5 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.29"]
[Round "8"]
[White "Dueckstein, Andreas"]
[Black "Barcza, Gedeon"]
[Result "1-0"]
[ECO "B17"]
[EventDate "1964.07.21"]
[PlyCount "79"]

1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Bc4 Ngf6 6.Ng5 e6 7.Qe2 Nb6 8.Bb3 
c5 9.N1f3 h6 10.dxc5 Bxc5 11.Ne4 Nxe4 12.Qxe4 O-O 13.Bd2 Nd7 14.O-O-O Qb6 
15.g4 Be7 16.g5 Nc5 17.Qe2 Nxb3+ 18.axb3 hxg5 19.Rhg1 f6 20.h4 Qa6 21.Qxa6
bxa6 22.hxg5 fxg5 23.Bxg5 Bc5 24.Ne5 Rxf2 25.Bh6 Rf7 26.Rd8+ Kh7 27.Rh8+ 
Kxh8 28.Nxf7+ Kg8 29.Rxg7+ Kf8 30.Kd2 Bd4 31.Ne5 Bxe5 32.Rxa7+ Ke8 33.Rxa8
Kd7 34.Ra7+ Kc6 35.Re7 Bxb2 36.c3 Ba3 37.b4 Bd7 38.Kc2 Kd6 39.Rxd7+ Kxd7 
40.Kb3 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.29"]
[Round "8"]
[White "Kuijpers, Franciscus"]
[Black "Van Scheltinga, Theodore"]
[Result "0-1"]
[ECO "C73"]
[EventDate "1964.07.21"]
[PlyCount "86"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6 6.d4 f5 7.exf5 e4 8.Ne5 
Bxf5 9.Nxc6 Qf6 10.Qh5+ g6 11.Qg5 Qe6 12.Qg3 Qd5 13.Qc3 Bg7 14.Nd2 e3 15.
Nf3 exf2+ 16.Kxf2 Nf6 17.Re1+ Ne4+ 18.Kg1 Kd7 19.Rxe4 Bxe4 20.Nb4 Qb7 21.
Qb3 Rhf8 22.d5 Bxf3 23.gxf3 Rae8 24.Bd2 Kc8 25.Qd3 Qb5 26.c4 Qc5+ 27.Kg2 
Qd4 28.Re1 Rxe1 29.Qxd4 Bxd4 30.Bxe1 Bxb2 31.Bd2 Re8 32.Kf1 Be5 33.Nxa6 
Kb7 34.Nb4 Bxh2 35.Nc6 Ra8 36.Ba5 Bf4 37.a3 Bc1 38.a4 h5 39.Kg2 Bf4 40.Kh3
g5 41.Kg2 g4 42.fxg4 hxg4 43.Kf1 Rh8 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.29"]
[Round "8"]
[White "Larsen, Bent"]
[Black "Enevoldsen, Jens"]
[Result "1-0"]
[ECO "A00"]
[EventDate "1964.07.21"]
[PlyCount "101"]

1.g3 Nf6 2.Bg2 e5 3.Nf3 d6 4.c4 g6 5.Nc3 Bg7 6.d4 exd4 7.Nxd4 O-O 8.O-O 
Nbd7 9.b3 c6 10.Bb2 Nc5 11.Qc2 a5 12.Rad1 Qb6 13.Rd2 a4 14.Nxa4 Nxa4 15.
bxa4 Qb4 16.Rfd1 Qxa4 17.Nb3 Ne8 18.Bxg7 Kxg7 19.c5 d5 20.Rd4 Qa3 21.Qc3 
Kg8 22.R1d2 Nc7 23.Rh4 Re8 24.e3 Ra4 25.Rxa4 Qxa4 26.h4 Qg4 27.Nd4 Re7 28.
a4 Ne8 29.a5 Nc7 30.Rb2 Qd1+ 31.Kh2 Qa1 32.Rc2 Qxc3 33.Rxc3 Na6 34.Bf1 Nb8
35.Rb3 Rc7 36.Rb6 Nd7 37.a6 bxa6 38.Rxc6 Rxc6 39.Nxc6 Bb7 40.Ne7+ Kf8 41.
c6 Kxe7 42.cxb7 Nb8 43.g4 Kd6 44.Kg3 Kc5 45.Bd3 a5 46.Bc2 Kb4 47.Kf4 a4 
48.Bxa4 Kxa4 49.Kg5 Kb3 50.Kh6 Kc2 51.Kxh7 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.29"]
[Round "8"]
[White "Van Geet, Dick Daniel"]
[Black "Lehmann, Heinz"]
[Result "0-1"]
[ECO "B06"]
[EventDate "1964.07.21"]
[PlyCount "108"]

1.Nc3 g6 2.d4 Bg7 3.e4 c5 4.Be3 cxd4 5.Bxd4 Nf6 6.e5 Ng8 7.e6 f6 8.exd7+ 
Qxd7 9.Bb5 Nc6 10.Qf3 a6 11.Ba4 b5 12.Bb3 Bb7 13.Qd5 Qxd5 14.Bxd5 e6 15.
Bf3 Nge7 16.Bb6 Nc8 17.Bc5 Rb8 18.O-O-O Ne5 19.Bxb7 Rxb7 20.Nge2 Nd7 21.
Be3 f5 22.f4 Kf7 23.Bd4 e5 24.fxe5 Nxe5 25.Rhf1 Re8 26.Ne4 Bh6+ 27.Kb1 Nc4
28.N2c3 Rbe7 29.b3 Ne3 30.Bxe3 Bxe3 31.Nd6+ Nxd6 32.Rxd6 Bh6 33.Rfd1 Bg7 
34.Nd5 Re1 35.Nc7 Rxd1+ 36.Rxd1 Re2 37.Nxa6 Rxg2 38.Nc7 Be5 39.Nxb5 Rxh2 
40.a4 Bf4 41.a5 Re2 42.a6 Re8 43.a7 Ra8 44.c4 h5 45.c5 h4 46.Rd7+ Kg8 47.
Nc3 h3 48.Nd5 Bg5 49.Nb6 h2 50.Rd1 Rxa7 51.b4 Bf6 52.c6 Ra1+ 53.Kc2 Rxd1 
54.c7 Rd8 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.31"]
[Round "9"]
[White "Barcza, Gedeon"]
[Black "Van Geet, Dick Daniel"]
[Result "1-0"]
[ECO "A10"]
[EventDate "1964.07.21"]
[PlyCount "39"]

1.c4 g5 2.d4 Bg7 3.Nc3 Nc6 4.d5 Ne5 5.Bxg5 Nxc4 6.Rc1 c6 7.e4 b5 8.dxc6 
Nxb2 9.c7 Qxc7 10.Nxb5 Qa5+ 11.Qd2 Qxd2+ 12.Bxd2 Rb8 13.Be3 Bb7 14.Bxa7 
Rd8 15.f3 f5 16.Rb1 fxe4 17.Bd4 e5 18.Bxb2 d5 19.Ba3 Bc6 20.Rc1 1-0

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.31"]
[Round "9"]
[White "Enevoldsen, Jens"]
[Black "Kuijpers, Franciscus"]
[Result "0-1"]
[ECO "C26"]
[EventDate "1964.07.21"]
[PlyCount "92"]

1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 4.d3 d6 5.f4 Ng4 6.f5 Bf2+ 7.Kf1 h5 8.h3 Ne3+ 
9.Bxe3 Bxe3 10.Qe1 Bxg1 11.Kxg1 h4 12.Qe2 c6 13.Kh2 Nd7 14.Rad1 Qf6 15.a4 
a5 16.Rhf1 Kd8 17.Kh1 Kc7 18.Rb1 Qe7 19.Qg4 Qf8 20.Qf3 Nf6 21.Rfd1 Nh5 22.
Ne2 Qe7 23.c3 Bd7 24.b4 g6 25.fxg6 fxg6 26.d4 Qg5 27.dxe5 Qxe5 28.bxa5 
Rxa5 29.Qf7 Qe8 30.Qf2 Rc5 31.Rd4 Rh7 32.Bd3 Qe7 33.Rdb4 Bc8 34.Qd4 Ng3+ 
35.Nxg3 hxg3 36.a5 Qe6 37.Bf1 g5 38.Kg1 g4 39.Qe3 Qe5 40.c4 Rh4 41.R4b3 
gxh3 42.gxh3 Rxe4 43.Qxg3 Rxa5 44.Rf3 Qxg3+ 45.Rxg3 Re7 46.Rf3 Be6 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.31"]
[Round "9"]
[White "Lehmann, Heinz"]
[Black "Donner, Jan"]
[Result "0-1"]
[ECO "B11"]
[EventDate "1964.07.21"]
[PlyCount "92"]

1.e4 c6 2.Nc3 d5 3.Nf3 Bg4 4.h3 Bxf3 5.Qxf3 Nf6 6.g4 e6 7.Bg2 Bb4 8.O-O 
O-O 9.d3 Nbd7 10.Ne2 Bd6 11.Qe3 Qc7 12.Kh1 dxe4 13.dxe4 e5 14.b3 Nc5 15.
Bb2 Ne6 16.Rad1 Rfd8 17.Qc3 Nd7 18.Rd2 Ndf8 19.Rfd1 Ng6 20.Bf1 Be7 21.Ng3 
Bc5 22.Rxd8+ Rxd8 23.Rxd8+ Qxd8 24.Qe1 Qb6 25.Nf5 Bxf2 26.Qd2 Bc5 27.h4 
Qc7 28.a4 h6 29.Kh2 a5 30.Bc4 Ngf4 31.Bc3 b6 32.Kg3 Bd4 33.Bxd4 exd4 34.
Kf3 Ng6 35.Bxe6 fxe6 36.Nxd4 Nxh4+ 37.Ke2 Qg3 38.Qe1 Qxg4+ 39.Kd3 c5 40.
Nb5 Nf3 41.Qf1 Ne5+ 42.Ke3 h5 43.Nd6 Qg3+ 44.Ke2 h4 45.Nc8 Nc6 46.Qf2 Qc7 
0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.31"]
[Round "9"]
[White "Pirc, Vasja"]
[Black "Larsen, Bent"]
[Result "0-1"]
[ECO "A30"]
[EventDate "1964.07.21"]
[PlyCount "56"]

1.Nf3 Nf6 2.g3 c5 3.c4 Nc6 4.Bg2 g6 5.b3 Bg7 6.Bb2 O-O 7.Nc3 d6 8.O-O Bf5 
9.d4 Qa5 10.e3 Rad8 11.Qd2 cxd4 12.Nxd4 Nxd4 13.exd4 d5 14.c5 b6 15.cxb6 
axb6 16.Rfe1 Rd7 17.Re2 Rc8 18.Na4 Qxd2 19.Rxd2 Rc6 20.f3 Bh6 21.Re2 Rdc7 
22.Bf1 Bd3 23.Re5 Bxf1 24.Rxf1 e6 25.Re2 Nd7 26.b4 Bg7 27.Rd2 Rc4 28.a3 
Ra7 0-1

[Event "4th IBM tournament"]
[Site "Amsterdam NED"]
[Date "1964.07.31"]
[Round "9"]
[White "Van Scheltinga, Theodore"]
[Black "Dueckstein, Andreas"]
[Result "0-1"]
[ECO "D25"]
[EventDate "1964.07.21"]
[PlyCount "76"]

1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 Bg4 5.Bxc4 e6 6.h3 Bh5 7.Nc3 Nf6 8.g4 Bg6 
9.Ne5 Nbd7 10.Nxg6 hxg6 11.Qf3 Rb8 12.Bb3 Nb6 13.h4 c5 14.dxc5 Bxc5 15.Bd2
Nfd7 16.Qg3 Be7 17.h5 Nc5 18.Bc2 Bd6 19.Qg2 gxh5 20.gxh5 Nc4 21.Rd1 Nxb2 
22.Bc1 Nxd1 23.Qxg7 Ke7 24.Nxd1 Qa5+ 25.Bd2 Qxa2 26.Bg6 Rbf8 27.Bc3 Qd5 
28.Bf6+ Kd7 29.Rh4 Rhg8 30.Qh7 Kc8 31.Rd4 Qh1+ 32.Ke2 fxg6 33.hxg6 Qc6 34.
g7 Re8 35.e4 Nd7 36.Qg6 Nxf6 37.Qxf6 Qb5+ 38.Rd3 Be5 0-1

