[Event "World U20-ch04"]
[Site "Toronto"]
[Date "1957.08.09"]
[Round "6"]
[White "Lombardy, William James"]
[Black "Aldrete, Jorge"]
[Result "1-0"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 d5 9. Bb5 Bd7 10. exd5 Nxd4 11. Bxd7+ Qxd7 12. Bxd4 Rd8 13. O-O b6 14. Rad1 O-O 15. Rfe1 Rfe8 16. Be5 Qf5 17. Qd3 Qxd3 18. Rxd3 Rd7 19. f4 Red8 20. Red1 Nh5 21. g3 f5 22. Ne2 Nf6 23. c4 Ne4 24. Nd4 Nc5 25. Re3 Rc8 26. Rc1 Ne4 27. b3 Rxd5 28. Bxg7 Kxg7 29. Nf3 Rd6 30. Kf1 Rcd8 31. Ke1 h6 32. b4 Kf6 33. Ra3 Rd3 34. Rxd3 Rxd3 35. Ne5 Rd2 36. c5 bxc5 37. bxc5 Rxh2 38. Rc4 Rxa2 39. c6 Nd6 40. c7 Nc8 41. Rc6+ e6 42. Rc3 Ra6 43. Rb3 1-0