[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1976.??.??"]
[Round "2"]
[White "Bisguier, Arthur Bernard"]
[Black "Porterfield, Michael"]
[Result "1-0"]
[ECO "B12"]
[WhiteElo "2440"]
[PlyCount "45"]
[EventDate "1976.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. c4 e6 5. Nc3 dxc4 6. Bxc4 Nd7 7. Nge2 Ne7 8. 0-0 Nb6 9. Bb3 Qd7 10. Ng3 0-0-0 11. Be3 Bg6 12. a4 Kb8 13. Qe2 Nbd5 14. a5 Nf5 15. Nxf5 Bxf5 16. a6 Nb4 17. Rfd1 b6 18. Bf4 Nd5 19. Nxd5 cxd5 20. Bg5 f6 21. exf6 Re8 22. Ba4 Qd6 23. Rac1 1-0

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1976.??.??"]
[Round "7"]
[White "Dorsch, Thomas"]
[Black "Porterfield, Michael"]
[Result "1-0"]
[ECO "B14"]
[PlyCount "73"]
[EventDate "1976.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. e4 c6 2. c4 d5 3. exd5 cxd5 4. d4 Nf6 5. Nc3 e6 6. Nf3 Be7 7. c5 b6 8. b4 a5 9. Na4 Nfd7 10. a3 axb4 11. axb4 bxc5 12. bxc5 Nc6 13. Be2 0-0 14. 0-0 Ba6 15. Bf4 Re8 16. Bxa6 Rxa6 17. Nc3 Qa8 18. Nb5 Rxa1 19. Qxa1 Qxa1 20. Rxa1 e5 21. dxe5 Nxc5 22. Nd6 Bxd6 23. exd6 Ne6 24. Bg3 Ncd4 25. Nxd4 Nxd4 26. Kf1 f6 27. Ra5 Rd8 28. Rxd5 Ne6 29. Ke2 Kf7 30. Kd3 g6 31. Ra5 Rd7 32. Kc4 Nd8 33. Kd5 Ke8 34. Rc5 Kf7 35. Rc7 Ke8 36. f3 h5 37. Bf2 1-0

[Event "Phoenix Del Web Townhouse Summer"]
[Site "Phoenix"]
[Date "1976.??.??"]
[Round "?"]
[White "Gollub, Dan"]
[Black "Porterfield, Michael"]
[Result "1/2-1/2"]
[ECO "B22"]
[PlyCount "183"]
[EventDate "1976.??.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 exd5 5. Ngf3 Nc6 6. c3 cxd4 7. cxd4 Bd6 8. Bd3 Nf6 9. 0-0 0-0 10. h3 Re8 11. Re1 Rxe1+ 12. Qxe1 Bd7 13. Nb3 Qb6 14. Be3 Nb4 15. Bb1 Re8 16. Nc5 Bc8 17. a3 Nc6 18. Qc1 Qc7 19. b4 Ne7 20. Ba2 h6 21. Nd3 Ng6 22. Qxc7 Bxc7 23. Rc1 Bd6 24. Nfe5 Ne7 25. g4 Rd8 26. Kg2 Nd7 27. Bf4 Nf8 28. Nf3 Ne6 29. Bxd6 Rxd6 30. b5 Bd7 31. a4 a6 32. Nde5 Be8 33. bxa6 Rxa6 34. Bb3 Bxa4 35. Bxa4 Rxa4 36. Rb1 Ra7 37. h4 Nc7 38. g5 hxg5 39. hxg5 b5 40. Rb3 Rb7 41. Nh2 Ne6 42. Nhf3 Nf5 43. Rb4 Nd6 44. Nd3 Ne4 45. g6 f6 46. Nh4 Nd6 47. Nc5 Re7 48. Rb2 Nxd4 49. Rd2 N4f5 50. Nxf5 Nxf5 51. Rxd5 Nh4+ 52. Kg3 Nxg6 53. Rd8+ Kh7 54. Rb8 Ne5 55. Rxb5 Ra7 56. Rb7 Ra3+ 57. Kg2 Kh6 58. Ne6 g6 59. Nf8 Ra4 60. f3 Ra8 61. Rh7+ Kg5 62. Rh8 Ra2+ 63. Kg3 Kf5 64. Rh3 g5 65. Nh7 Ra6 66. Kg2 Kg6 67. Nxf6 Kxf6 68. f4 Ra2+ 69. Kg3 gxf4+ 70. Kxf4 Ng6+ 71. Kg3 Ra3+ 72. Kg2 Ra2+ 73. Kg3 Kg5 74. Rh7 Ra3+ 75. Kf2 Ne5 76. Rh8 Ng4+ 77. Ke2 Kf4 78. Re8 Ne5 79. Kd2 Ke4 80. Rd8 Nf3+ 81. Kc2 Nd4+ 82. Kb2 Rb3+ 83. Kc1 Kd3 84. Rd7 Rb4 85. Rd8 Rb7 86. Rd5 Ra7 87. Rd8 Ra6 88. Rd7 Kc3 89. Rc7+ Nc6 90. Kd1 Kd3 91. Rd7+ Nd4 92. Ke1 1/2-1/2

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1976.??.??"]
[Round "5"]
[White "Porterfield, Michael"]
[Black "Dreman, I."]
[Result "1-0"]
[ECO "B43"]
[PlyCount "75"]
[EventDate "1976.??.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bd3 d6 7. 0-0 Qc7 8. a4 g6 9. Be3 Bg7 10. Nb3 Nc6 11. a5 0-0 12. f4 Qe7 13. e5 Nd7 14. exd6 Qxd6 15. Ne4 Qc7 16. c3 Nf6 17. Bc5 Re8 18. Bb6 Qb8 19. Nxf6+ Bxf6 20. Qf3 Bd8 21. Be3 Ne7 22. Be4 Nf5 23. Bc5 Bc7 24. Nd2 Nd6 25. b4 f5 26. Bc2 Bd7 27. Bb3 Bc6 28. Qe3 Ne4 29. Nxe4 Bxe4 30. Rad1 Qc8 31. Rd2 Rd8 32. Rxd8+ Bxd8 33. Rd1 Bc7 34. Qd4 Bb8 35. Qf6 Bd5 36. Rxd5 Ba7 37. Rd8+ Qxd8 38. Bxe6# 1-0

[Event "Phoenix Del Web Townhouse Summer"]
[Site "Phoenix"]
[Date "1976.??.??"]
[Round "?"]
[White "Porterfield, Michael"]
[Black "Roy, David W"]
[Result "0-1"]
[ECO "A55"]
[PlyCount "84"]
[EventDate "1976.??.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 c6 3. c4 Nd7 4. Nc3 Ngf6 5. Nf3 e5 6. Be2 Be7 7. 0-0 Qc7 8. Rb1 a5 9. a3 exd4 10. Qxd4 a4 11. Bf4 0-0 12. c5 Ne8 13. cxd6 Bxd6 14. e5 Bc5 15. Qe4 Qa5 16. Ng5 g6 17. e6 fxe6 18. Qxe6+ Kg7 19. Qc4 Ndf6 20. Nce4 Nxe4 21. Qxe4 Bf5 22. Qe5+ Nf6 23. Ne6+ Bxe6 24. Qxe6 Rae8 25. Qh3 Rxe2 26. Bh6+ Kg8 27. Bxf8 Bxf8 28. b4 Qf5 29. Qxf5 gxf5 30. Rfe1 Ra2 31. Re3 Nd5 32. Rf3 f4 33. g3 Bh6 34. Re1 Kf7 35. Re4 Rb2 36. Rd4 Ke6 37. gxf4 Rb1+ 38. Kg2 Rb3 39. f5+ Kf6 40. Re4 Bc1 41. Re1 Bxa3 42. Ra1 Nc3 0-1

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1975.03.07"]
[Round "8"]
[White "Slifko, D."]
[Black "Porterfield, Michael"]
[Result "0-1"]
[ECO "B80"]
[PlyCount "62"]
[EventDate "1975.03.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g3 Be7 7. Bg2 a6 8. 0-0 Qc7 9. Qd2 Bd7 10. b3 Nc6 11. Nde2 0-0 12. f4 Rfd8 13. h3 b5 14. a3 Rab8 15. Kh2 a5 16. Bb2 b4 17. axb4 axb4 18. Nd1 Ra8 19. Rb1 Ra2 20. Ne3 Be8 21. g4 Nd7 22. Ng3 Bf8 23. f5 Nde5 24. g5 Qb6 25. Qf2 Bd7 26. Qf4 Bc8 27. Ng4 Ba6 28. Rfd1 Rc8 29. Nh5 Nxg4+ 30. Qxg4 Ne5 31. Qf4 Rxc2 0-1

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1975.03.05"]
[Round "2"]
[White "Goichberg, William"]
[Black "Porterfield, Michael"]
[Result "1/2-1/2"]
[ECO "B13"]
[PlyCount "100"]
[EventDate "1975.03.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3 Nc6 5. c3 Nf6 6. Bf4 Bg4 7. Qb3 Qc8 8. h3 Bd7 9. Nf3 e6 10. Nbd2 Be7 11. 0-0 a6 12. Ne5 b5 13. Rae1 Na5 14. Qc2 b4 15. c4 dxc4 16. Ndxc4 Nxc4 17. Nxc4 Bb5 18. Qb3 Qd8 19. Be5 0-0 20. Rc1 Rc8 21. Ne3 Qd7 22. Bxb5 Qxb5 23. Nc4 Rfd8 24. Nd6 Bxd6 25. Bxd6 Rxc1 26. Rxc1 Nd5 27. Rc4 a5 28. a4 Qb7 29. Be5 f6 30. Bg3 Rc8 31. Qc2 Rxc4 32. Qxc4 Kf7 33. b3 Ne7 34. Qc7 Qxc7 35. Bxc7 Nc6 36. Bb6 Ke7 37. Bc5+ Kd7 38. Kf1 Nd8 39. Ke2 Nb7 40. Bf8 g6 41. Kd3 Kc6 42. Kc4 f5 43. f4 Nd8 44. Be7 Nb7 45. Bf8 Nd8 46. g4 h5 47. g5 Nb7 48. Be7 Kd7 49. Bc5 Kc6 50. Be7 Kd7 1/2-1/2

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1975.03.04"]
[Round "4"]
[White "Porterfield, Michael"]
[Black "Madsen, Craig"]
[Result "0-1"]
[ECO "E93"]
[PlyCount "136"]
[EventDate "1975.03.03"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 d6 2. d4 g6 3. Nf3 Bg7 4. c4 Nf6 5. Nc3 0-0 6. Be2 e5 7. d5 Nbd7 8. Bg5 h6 9. Bh4 g5 10. Bg3 Nh5 11. Nd2 Nf4 12. 0-0 Nc5 13. Re1 f5 14. f3 Ng6 15. exf5 Bxf5 16. Nde4 Nxe4 17. Nxe4 Qe8 18. Bd3 Nf4 19. Bc2 Qg6 20. Rc1 h5 21. Nf2 Bh6 22. Bxf5 Rxf5 23. Bxf4 Rxf4 24. Re4 Raf8 25. Qc2 Qg7 26. Rce1 g4 27. Rxf4 exf4 28. fxg4 hxg4 29. Re6 Qd4 30. Rg6+ Bg7 31. Rxg4 Re8 32. g3 f3 33. Re4 Rxe4 34. Qxe4 Qxb2 35. Qxf3 Qxa2 36. Qe4 Qa1+ 37. Kg2 Qe5 38. Qxe5 Bxe5 39. Nd3 Bc3 40. Nc1 Kg7 41. Kf3 Kf6 42. Na2 Bd2 43. Ke2 Bh6 44. Nc3 a6 45. Kd3 Ke5 46. h3 Bg5 47. Ne2 b5 48. cxb5 axb5 49. Nc3 b4 50. Nb5 Bd8 51. Kc4 b3 52. Kxb3 Kxd5 53. Kc3 c6 54. Na7 c5 55. Nb5 Ba5+ 56. Kc2 Be1 57. g4 Bh4 58. Nc7+ Ke5 59. Kc3 d5 60. Ne8 c4 61. Ng7 Be1+ 62. Kc2 d4 63. Nf5 d3+ 64. Kd1 Bb4 65. Ne3 Kd4 66. Nf5+ Ke4 67. Ng3+ Ke5 68. Nf1 c3 0-1

