[Event "IBM"]
[Site "Amsterdam"]
[Date "1967.??.??"]
[Round "4"]
[White "Portisch, Lajos"]
[Black "Enevoldsen, Jens"]
[Result "1/2-1/2"]
[WhiteElo ""]
[BlackElo ""]
[ECO "A25"]

1.c4 e5 2.Nc3 Nc6 3.g3 d6 4.Bg2 Be6 5.d3 Qd7 6.Rb1 Nge7 7.b4 d5 8.b5 Nd8
9.Nf3 dxc4 10.dxc4 Qxd1+ 11.Kxd1 f6 12.Nd2 Nf5 13.Bd5 c6 14.bxc6 bxc6 15.Bg2 Rc8
16.Nce4 Be7 17.e3 Nh6 18.f3 Nhf7 19.Re1 Rc7 20.Bf1 Nb7 21.Rb3 Na5 22.Rb8+ Kd7
23.Rxh8 Nxh8 24.Nb3 Nb7 25.Bd2 Nf7 26.g4 Ba3 27.Bc3 Nfd6 28.Ned2 e4 29.fxe4 Bxg4+
30.Be2 Bxe2+ 31.Kxe2 c5 32.e5 fxe5 33.Bxe5 Ke6 34.Bc3 g6 35.e4 Rf7 36.Ke3 a5
37.Rg1 Kd7 38.Rd1 a4 39.Nc1 Bxc1 40.Rxc1 Kc6 41.h4 Nd8 42.Rb1 Ne6 43.Be5 Nc8
44.Rf1 Rxf1 45.Nxf1 Nb6 46.Kd3 Nd7 47.Bg3 h5 48.Ne3 g5 49.hxg5 Nxg5 50.Nd5 h4  1/2-1/2

