[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.27"]
[Round "11"]
[White "Geller, Efim P"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. O-O Be6 9. f4 Qc7 10. Kh1 b5 11. a4 b4 12. Nd5 Bxd5 13. exd5 O-O 14. Bd2 a5 15. c3 Na6 16. cxb4 Nxb4 17. Bxb4 axb4 18. Bb5 Ne4 19. Rc1 Qa7 20. Qc2 f5 21. Nd2 exf4 22. Nxe4 fxe4 23. Qxe4 Qe3 24. Rce1 Qxe4 25. Rxe4 Bf6 26. Rxb4 Rfc8 27. b3 g5 28. g3 Be5 29. gxf4 gxf4 30. Bc6 Ra5 31. Rc4 Kg7 32. Kg2 Kf6 33. Kf3 Ra7 34. Rfc1 Rg8 35. b4 Rg6 36. Be8 Rh6 37. Rc7 Rxc7 38. Rxc7 Rxh2 39. b5 Kg5 40. Rf7 Rh3+ 41. Ke2 Re3+ 42. Kd2 1/2-1/2