[Event "US Open-58"]
[Site "Cleveland"]
[Date "1957.08.13"]
[Round "9"]
[White "Pehnec, B."]
[Black "Kaufman, Allen J"]
[Result "1-0"]
[ECO "B68"]
[PlyCount "59"]
[EventDate "1957.08.05"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. Qd2 Be7 8. 0-0-0 Nc6 9. f4 Bd7 10. Nf3 Qc7 11. e5 dxe5 12. fxe5 Nd5 13. Nxd5 exd5 14. Qxd5 Be6 15. Qe4 Rc8 16. Bc4 Bxc4 17. Qxc4 b5 18. Qe4 0-0 19. Bxe7 Qxe7 20. Rd6 Qc7 21. Rhd1 Nb4 22. c3 Nxa2+ 23. Kb1 Qa5 24. Ng5 g6 25. e6 Nxc3+ 26. bxc3 Qxc3 27. exf7+ Kg7 28. Qd4+ Kh6 29. Qh4+ Kg7 30. Qxh7# 1-0

[Event "US Open-58"]
[Site "Cleveland"]
[Date "1957.08.12"]
[Round "8"]
[White "Potter, Robert BM"]
[Black "Pehnec, B."]
[Result "0-1"]
[ECO "C29"]
[PlyCount "70"]
[EventDate "1957.08.05"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. d3 Nxc3 6. bxc3 Be7 7. Nf3 0-0 8. Be2 Bg4 9. 0-0 Nd7 10. d4 f6 11. h3 Be6 12. Qe1 fxe5 13. dxe5 Bc5+ 14. Kh1 Bf5 15. Bd3 Qe7 16. Bg5 Qe8 17. Qg3 Be4 18. Rae1 Qg6 19. Qg4 Bf5 20. e6 Bxd3 21. cxd3 Nf6 22. Qh4 h6 23. Bf4 c6 24. Ne5 Qh7 25. Rf3 Rae8 26. Nf7 Be7 27. Rg3 Ne4 28. Nxh6+ Qxh6 29. Bxh6 Nf2+ 30. Kg1 Bxh4 31. Rxg7+ Kh8 32. Rd7 Rg8 33. Rf1 Rxe6 34. Rxf2 Bxf2+ 35. Kxf2 Rxh6 0-1

[Event "US Open-58"]
[Site "Cleveland"]
[Date "1957.08.11"]
[Round "7"]
[White "Pehnec, B."]
[Black "Santasiere, Anthony Edward"]
[Result "0-1"]
[ECO "B05"]
[PlyCount "110"]
[EventDate "1957.08.05"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 e6 6. c4 Nb6 7. exd6 cxd6 8. 0-0 Be7 9. b3 Nc6 10. Nc3 d5 11. c5 Nd7 12. a3 0-0 13. b4 a6 14. Re1 f5 15. h3 Bh5 16. Ne5 Bxe2 17. Nxc6 Bxd1 18. Nxd8 Bxd8 19. Nxd1 Bf6 20. Rxe6 Rae8 21. Rxe8 Rxe8 22. Kf1 Bxd4 23. Bb2 Re4 24. Bxd4 Rxd4 25. Ne3 g6 26. Rd1 Rxd1+ 27. Nxd1 Kf7 28. Ke2 Ke6 29. Ke3 g5 30. Nc3 Ne5 31. a4 f4+ 32. Kd2 d4 33. Ne4 Kd5 34. Nxg5 h6 35. Nh7 Kc4 36. Nf6 f3 37. gxf3 Nxf3+ 38. Kd1 Kxb4 39. Ne4 Ng5 40. Nd6 Kxc5 41. Nxb7+ Kb4 42. h4 Nf3 43. h5 Kxa4 44. Ke2 Nh4 45. Kd3 Nf5 46. Ke4 Kb4 47. Nd8 Kc3 48. Kxf5 d3 49. Nf7 d2 50. Nxh6 d1Q 51. Ng4 a5 52. h6 a4 53. Nf6 Qd8 54. h7 a3 55. Kg6 Qh8 0-1

