[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "12"]
[White "Portisch, Lajos"]
[Black "Stein, Leonid"]
[Result "1/2-1/2"]
[WhiteElo ""]
[BlackElo ""]
[ECO "D74"]

1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.g3 d5 5.cxd5 Nxd5 6.Bg2 c6 7.O-O O-O 8.Nc3 Nb6
9.e3 a5 10.b3 Na6 11.Bb2 Bf5 12.h3 a4 13.e4 Be6 14.Ne2 Nc7 15.Rb1 Qc8 16.Nf4 axb3
17.axb3 Ra2 18.Qc2 Qd7 19.Ra1 Rfa8 20.Rxa2 Rxa2 21.Ra1 Rxa1+ 22.Bxa1 Qd6
23.Bb2 Bc8 24.Bf1 Ne6 25.Ne2 h6 26.Kh2 Ng5 27.Nd2 e5 28.Qc5 Qd8 29.Qb4 exd4
30.Bxd4 Bxd4 31.Nxd4 Nd7 32.Qd6 Qf6 33.Qxf6 Nxf6 34.Bg2 Ne6 35.Ne2 Nc5 36.f4 Ne8
37.Kg1 Nc7 38.Kf2 Be6 39.Nd4 Kf8 40.Ke3 Ke7  1/2-1/2

