[Event "Piatigorsky-Cup 2nd"]
[Site "Santa Monica"]
[Date "1966.07.27"]
[Round "7"]
[White "Donner, Jan Hein"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. cxd5 exd5 5. Bg5 c6 6. e3 Nbd7 7. Bd3 Be7 8. Qc2 O-O 9. Nf3 Re8 10. O-O Nf8 11. Rab1 a5 12. a3 Ng6 13. b4 axb4 14. axb4 Ne4 15. Bxe7 Qxe7 16. Rfc1 Bg4 17. Ne1 Rad8 18. Na4 b5 19. Nc5 Nd6 20. Ra1 Nc4 21. Rcb1 Ra8 22. Qc1 Nh4 23. Rxa8 Rxa8 24. Ra1 Qd8 25. g3 Nf3+ 26. Nxf3 Bxf3 27. Bf5 h5 28. Bh3 h4 29. Bg2 Rxa1 30. Qxa1 Bxg2 31. Kxg2 Qc8 32. h3 hxg3 33. Kxg3 Nd6 34. Kg2 Nf5 35. Qd1 Nh4+ 36. Kg3 Nf5+ 1/2-1/2