[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1973.03.12"]
[Round "1"]
[White "Oakes, GB."]
[Black "Grefe, John Alan"]
[Result "0-1"]
[ECO "E62"]
[PlyCount "88"]
[EventDate "1973.03.??"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. Nf3 g6 2. g3 d6 3. d4 Bg7 4. Bg2 Nf6 5. c4 0-0 6. Nc3 Nc6 7. e4 Bg4 8. 0-0 Nd7 9. Be3 e5 10. d5 Nd4 11. h3 Nxf3+ 12. Bxf3 Bxh3 13. Re1 Nf6 14. Kh2 Qc8 15. Rh1 Ng4+ 16. Bxg4 Bxg4 17. f3 Bd7 18. Qd2 f5 19. Bh6 Rf7 20. Kg2 Qf8 21. exf5 gxf5 22. Rh4 Bxh6 23. Qxh6 Qxh6 24. Rxh6 a6 25. a4 Re8 26. b4 Rg7 27. b5 Rg6 28. Rh4 a5 29. Kf2 Re7 30. Re1 Reg7 31. Rg1 Be8 32. Ne2 Rf6 33. Nc3 c6 34. Rb1 cxd5 35. Nxd5 Rfg6 36. Re1 Bd7 37. Rh2 Be6 38. Rd1 Bxd5 39. Rxd5 Rc7 40. Rh4 Kg7 41. Rd2 f4 42. Rg4 Rxg4 43. fxg4 Rxc4 44. Rxd6 Rc2+ 0-1

