[Event "Piatigorsky-Cup 2nd"]
[Site "Santa Monica"]
[Date "1966.08.01"]
[Round "10"]
[White "Unzicker, Wolfgang"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]

1. Nf3 d5 2. c4 c6 3. d4 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Bg4 10. h3 Bh5 11. Rd1 Nbd7 12. e4 Qe7 13. e5 Nd5 14. Ne4 f5 15. exf6 gxf6 16. Ng3 Bg6 17. Bh6 Rfe8 18. Bd2 a5 19. Bxb4 axb4 20. Bb3 Ra5 21. Re1 Nf8 22. Qd2 Rea8 23. Rac1 Nb6 24. Ne4 Nxa4 25. Rc4 Rb5 26. Bxa4 Rxa4 27. Nc5 Raa5 28. Rxb4 b6 29. Rxb5 Rxb5 30. Ne4 Rb3 31. Qf4 1/2-1/2