[Event "Piatigorsky-Cup 2nd"]
[Site "Santa Monica"]
[Date "1966.07.25"]
[Round "6"]
[White "Portisch, Lajos"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 c5 7. d5 a6 8. a4 Qa5 9. Bd2 e6 10. Nf3 exd5 11. cxd5 Re8 12. O-O Qc7 13. Qc2 Bg4 14. h3 Bxf3 15. Bxf3 Nbd7 16. a5 Re7 17. Ra4 Rae8 18. Be2 h6 19. Kh2 g5 20. Bg4 Nxg4+ 21. hxg4 Be5+ 22. g3 Nf6 23. f3 Qd7 24. Raa1 h5 25. gxh5 Nxh5 26. Ne2 g4 27. Nf4 gxf3 28. Qd3 Qg4 29. Qxf3 Qxf3 30. Rxf3 Nf6 31. Bc3 Nxe4 32. Bxe5 Rxe5 33. Rb3 R8e7 34. Rb6 Rd7 35. Re1 Nf6 36. Rxe5 Ng4+ 37. Kh3 Nxe5 38. Nh5 Kf8 39. Nf6 Rc7 40. Rxd6 Nc4 41. Rd7 Rxd7 42. Nxd7+ Ke7 43. Nxc5 1/2-1/2