[Event "USA-ch"]
[Site "Chicago"]
[Date "1974.??.??"]
[Round "6"]
[White "Commons, Kim S"]
[Black "Grefe, John Alan"]
[Result "0-1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. d4 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Nd2 c5 10. Rb1 b6 11. b4 Kh8 12. bxc5 bxc5 13. Nb3 Ne8 14. Bd2 f5 15. f3 Nf6 16. Qc2 Neg8 17. Nb5 a6 18. Na3 Nh5 19. g3 Ra7 20. Na5 Raf7 21. Nc6 Qf6 22. Qc1 g5 23. Bd3 Qg6 24. Rb8 f4 25. g4 Nhf6 26. h3 h5 27. Qc2 Qh7 28. Ba5 Nd7 29. Ra8 Rf6 30. Rf2 Rh6 31. Rh2 Ndf6 32. Nd8 Bd7 33. Rxa6 hxg4 34. hxg4 Bxg4 35. fxg4 Nxg4 36. Rxh6 Qxh6 37. Qg2 N8f6 38. Qh1 Qxh1+ 39. Kxh1 Nf2+ 40. Kg2 Nxd3 41. Ne6 Rg8 42. Nb5 Nxe4 43. Nxd6 Nxd6 44. Rxd6 g4 45. Rd7 f3+ 46. Kg3 f2 47. Rf7 Bh6 48. d6 Bf4+ 49. Nxf4 exf4+ 50. Kg2 f3+ 51. Kf1 Rb8 52. Bc3+ Kg8 53. Rg7+ Kf8 0-1