[Event "Mar del Plata International-27"]
[Site "Mar del Plata"]
[Date "1966.03.15"]
[Round "4"]
[White "Guimard, Carlos Enrique"]
[Black "Stein, Leonid"]
[Result "1/2-1/2"]

1. d4 Nf6 2. Nf3 d6 3. g3 g6 4. Bg2 Bg7 5. O-O O-O 6. c4 Nc6 7. Nc3 e5 8. dxe5 dxe5 9. Bg5 Be6 10. Qa4 h6 11. Rad1 Qb8 12. Bxf6 Bxf6 13. Rd2 Qe8 14. Rfd1 Bg7 15. Qb5 a6 16. Qxb7 Ra7 17. Qb3 Na5 18. Qb4 Nxc4 19. Rd8 Qxd8 20. Rxd8 Rxd8 21. Qe7 Raa8 22. h4 Bf8 23. Qxc7 Rdc8 24. Qb7 Rab8 25. Qxa6 Rb6 26. Qa7 Rxb2 27. h5 Nd6 28. Qe3 Rc2 29. hxg6 R2xc3 30. Qxe5 Rc1+ 31. Kh2 R8c5 32. gxf7+ Bxf7 33. Qf4 R1c4 34. Nd4 Rh5+ 35. Bh3 Nf5 36. e3 Nxd4 37. exd4 Be6 38. Qe4 Rxh3+ 39. Kg2 Kf7 40. Qf3+ Ke7 41. d5 Bg4 42. d6+ Kxd6 43. Qxf8+ Kd5 44. Qd8+ 1/2-1/2