[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.27"]
[Round "12"]
[White "Ivkov, Borislav"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Qc2 Nxc3 9. Qxc3 c5 10. Rd1 d6 11. b3 Bf6 12. Bb2 Qe7 13. Qd2 Rd8 14. dxc5 bxc5 15. Bxf6 Qxf6 1/2-1/2