[Event "Piatigorsky-Cup 2nd"]
[Site "Santa Monica"]
[Date "1966.07.28"]
[Round "8"]
[White "Ivkov, Borislav"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nf6 5. Nxf6+ gxf6 6. Be2 Bf5 7. Nf3 e6 8. O-O Bg7 9. c4 O-O 10. Be3 Nd7 11. d5 Bg6 12. Qb3 Qc7 13. Rfd1 c5 14. Nh4 Rad8 15. Rd2 b6 16. Rad1 Rfe8 17. Qa4 Nf8 18. dxe6 Nxe6 19. Rd7 Qe5 20. Nf3 Qxb2 21. Rxd8 Rxd8 22. Rxd8+ Nxd8 23. Bf1 Ne6 24. Qxa7 Bf8 25. Qb8 Kg7 26. a4 Qb4 27. Bd2 Qb1 28. a5 bxa5 1/2-1/2