[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "11"]
[White "Ree, Hans"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]
[WhiteElo ""]
[BlackElo ""]
[ECO "B48"]

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qc7 5.Nc3 e6 6.Be3 a6 7.Bd3 Nf6 8.O-O Bd6
9.Kh1 Bf4 10.Bxf4 Qxf4 11.Nde2 Qh4 12.Qd2 b5 13.a3 Ng4 14.Qf4 Nce5 15.h3 g5
16.Qg3 Qxg3 17.Nxg3 Nf6 18.f4 gxf4 19.Rxf4 Rg8 20.Nge2 Ke7 21.Raf1 Rg6 22.Rh4 Bb7
23.Nf4 Rg7 24.Rh6 Ng8 25.Rh4 Rf8 26.Rf2 f5 27.Nh5 Rg5 28.exf5 Nxd3 29.cxd3 Rfxf5
30.Rxf5 Rxf5 31.Kg1 Rg5 32.g4 Kf7 33.Kf2 Rc5 34.Ke3 a5 35.d4 Rg5 36.b4 axb4
37.axb4 Bc6  1/2-1/2

