[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.??.??"]
[Round "6"]
[White "Portisch, Lajos"]
[Black "Smyslov, Vassily"]
[Result "1/2-1/2"]
[WhiteElo "2630"]
[BlackElo "2620"]
[ECO "E56"]

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

