[Event "Oklahoma City op 66th"]
[Site "Oklahoma"]
[Date "2011.07.09"]
[Round "2"]
[White "Irwin, Philip R"]
[Black "Berry, James E"]
[Result "0-1"]
[ECO "A38"]
[WhiteElo "1885"]
[BlackElo "2016"]
[PlyCount "74"]
[EventDate "2011.07.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. Nf3 Nf6 6. 0-0 0-0 7. a3 d5 8. cxd5 Nxd5 9. Nxd5 Qxd5 10. d3 Qh5 11. Rb1 Bh3 12. Qd2 Bxg2 13. Kxg2 h6 14. b4 cxb4 15. axb4 Rfd8 16. Bb2 e5 17. b5 Nd4 18. Bxd4 exd4 19. Qf4 Qd5 20. Kg1 Re8 21. Rfe1 Rac8 22. Rb4 g5 23. Qd2 Rc3 24. Ra1 Rec8 25. Ne1 Bf8 26. Rbb1 Rb3 27. Qa5 Bc5 28. Qa4 Rc3 29. Rc1 Bb6 30. Rd1 Re8 31. Rd2 Rb3 32. Qc4 Qxb5 33. Qxb5 Rxb5 34. Rc2 Rc5 35. Ra4 Rxc2 36. Nxc2 Rxe2 37. Nxd4 Rd2 0-1

[Event "Oklahoma City op 66th"]
[Site "Oklahoma"]
[Date "2011.07.09"]
[Round "1"]
[White "Winters, William"]
[Black "Irwin, Philip R"]
[Result "0-1"]
[ECO "B12"]
[BlackElo "1885"]
[PlyCount "60"]
[EventDate "2011.07.09"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "CBM 143 Extra"]
[Source "ChessBase"]
[SourceDate "2011.08.29"]
[SourceVersion "1"]
[SourceVersionDate "2011.08.29"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. f3 e6 4. Ne2 dxe4 5. fxe4 Qh4+ 6. Ng3 Nf6 7. Bd3 c5 8. Be3 cxd4 9. Bb5+ Bd7 10. Bxd7+ Nbxd7 11. Qxd4 Bc5 12. Qd3 Nxe4 13. 0-0 Nxg3 14. Bxc5 Nxf1 15. Nc3 Nxc5 16. Qb5+ Nd7 17. Rxf1 Qd4+ 18. Kh1 Qb6 19. Qh5 Nf6 20. Qg5 Kf8 21. b3 h6 22. Qf4 Qc6 23. Rf3 Rd8 24. h4 Qd6 25. Qc1 Ke7 26. Rd3 Qb4 27. Rg3 Qxh4+ 28. Rh3 Qb4 29. Qe3 Nd5 30. Qe5 Nxc3 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.30"]
[Round "10"]
[White "Irwin, Philip R"]
[Black "Schuller, John J"]
[Result "0-1"]
[ECO "A22"]
[WhiteElo "1896"]
[BlackElo "1916"]
[PlyCount "80"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. c4 e5 2. g3 Nf6 3. Bg2 d6 4. Nc3 c6 5. e4 Be7 6. Nge2 Nbd7 7. 0-0 0-0 8. d3 Re8 9. h3 a6 10. a4 a5 11. Be3 Kh8 12. Kh2 Ng8 13. f4 Rf8 14. Qd2 g6 15. Rf2 Bf6 16. Raf1 Qe7 17. d4 Bg7 18. fxe5 dxe5 19. d5 f6 20. Nc1 Qb4 21. b3 f5 22. exf5 gxf5 23. dxc6 bxc6 24. Bxc6 Ra6 25. Bb5 Rg6 26. Nd5 Qxd2 27. Bxd2 Ndf6 28. Bxa5 Ne4 29. Rc2 Rh6 30. Nb6 Bb7 31. Nd5 Ngf6 32. Kg1 Rxh3 33. Rxf5 Nxd5 34. Rxf8+ Bxf8 35. cxd5 Bc5+ 36. Kf1 Rh1+ 37. Ke2 Rxc1 38. Bc6 Ba6+ 39. Kf3 Nf6 40. b4 Rf1+ 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.29"]
[Round "9"]
[White "Fast, Nathaniel S"]
[Black "Irwin, Philip R"]
[Result "1-0"]
[ECO "A11"]
[WhiteElo "2131"]
[BlackElo "1896"]
[PlyCount "97"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 c6 3. Bg2 d5 4. Nf3 Bf5 5. 0-0 e6 6. d3 Nbd7 7. Nc3 Bd6 8. cxd5 Nxd5 9. Nxd5 cxd5 10. e4 Bg4 11. exd5 0-0 12. dxe6 fxe6 13. h3 Bxf3 14. Bxf3 Qb6 15. Qe2 Rxf3 16. Qxf3 Rf8 17. Qe4 Ne5 18. Bf4 Rf5 19. Rac1 g5 20. Rc8+ Kg7 21. Bxe5+ Rxe5 22. Qa4 Rb5 23. Qg4 Rf5 24. b3 Bc5 25. Qe2 Qd6 26. Kg2 Qd7 27. Rb8 Bd4 28. Qe4 Rd5 29. Re1 e5 30. Rc1 Qf7 31. Qf3 Rd7 32. Qxf7+ Rxf7 33. Rc2 Rd7 34. Kf1 b6 35. Rbc8 Bc5 36. b4 Bxb4 37. R8c7 Rxc7 38. Rxc7+ Kg6 39. Rxa7 h5 40. g4 hxg4 41. hxg4 Kf6 42. Ke2 Bc5 43. Rh7 Kg6 44. Rh5 Bd4 45. a4 Kf6 46. Rh6+ Kg7 47. Rc6 Kf7 48. Kf3 Ke7 49. Ke4 1-0

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.29"]
[Round "8"]
[White "Irwin, Philip R"]
[Black "Kelly, Joey M"]
[Result "1-0"]
[ECO "A14"]
[WhiteElo "1896"]
[PlyCount "85"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. c4 e6 2. g3 d5 3. Bg2 Nf6 4. Nf3 Be7 5. 0-0 b6 6. Nc3 Bb7 7. cxd5 Nxd5 8. Nxd5 Bxd5 9. Qa4+ Qd7 10. Qc2 c5 11. Rd1 0-0 12. d4 Rd8 13. dxc5 Qc8 14. Ng5 Bxg5 15. Bxg5 f6 16. Be3 Na6 17. Bxd5 exd5 18. Rac1 bxc5 19. Bxc5 Qb7 20. Bd4 Rac8 21. Qf5 Rxc1 22. Rxc1 Nc7 23. Qg4 Rf8 24. Qd7 Rf7 25. Qd8+ Rf8 26. Qxc7 Qxc7 27. Rxc7 Ra8 28. Rxa7 Rxa7 29. Bxa7 Kf7 30. Bd4 Ke7 31. b4 Kd8 32. a4 Kc7 33. a5 Kc6 34. a6 f5 35. b5+ Kc7 36. b6+ Kb8 37. Kg2 g6 38. b7 h6 39. Be5+ Ka7 40. b8Q+ Kxa6 41. Bd4 Ka5 42. Bc5 Ka4 43. Qb4# 1-0

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.28"]
[Round "5"]
[White "Irwin, Philip R"]
[Black "Griffin, Raymond"]
[Result "1/2-1/2"]
[ECO "A10"]
[WhiteElo "1896"]
[PlyCount "34"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. c4 e6 2. g3 f5 3. Bg2 Nf6 4. Nc3 Be7 5. d3 0-0 6. Nf3 Nc6 7. e4 fxe4 8. dxe4 d6 9. 0-0 Qe8 10. Nd4 e5 11. Ndb5 Bd8 12. Nd5 Nxd5 13. cxd5 Ne7 14. Qe2 a6 15. Nc3 Ng6 16. Be3 Bf6 17. Rac1 Bd7 1/2-1/2

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.28"]
[Round "6"]
[White "Landolfi, Michael"]
[Black "Irwin, Philip R"]
[Result "0-1"]
[ECO "D60"]
[WhiteElo "1771"]
[BlackElo "1896"]
[PlyCount "66"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. Bg5 h6 4. Bh4 Be7 5. e3 d5 6. c4 0-0 7. Nc3 Nbd7 8. Bd3 dxc4 9. Bxc4 c6 10. 0-0 Nd5 11. Bxe7 Qxe7 12. Nxd5 exd5 13. Bd3 Re8 14. Rc1 Qd6 15. Qd2 Nf6 16. Qc2 Bg4 17. Ne5 Bh5 18. f3 Nd7 19. Nxd7 Qxd7 20. Rfe1 f6 21. b4 Re7 22. Bf5 Qe8 23. Kf2 Qd8 24. a4 Be8 25. Qd3 Qd6 26. g3 Qxb4 27. Ra1 Qb2+ 28. Qe2 Qb4 29. Reb1 Qd6 30. Qc2 Bd7 31. Bg6 Qe6 32. Ra3 f5 33. Bh5 g6 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.27"]
[Round "3"]
[White "Bailey, Daniel F"]
[Black "Irwin, Philip R"]
[Result "0-1"]
[ECO "D38"]
[BlackElo "1896"]
[PlyCount "64"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bg5 Bb7 6. e3 h6 7. Bh4 0-0 8. Be2 d5 9. 0-0 Nbd7 10. cxd5 exd5 11. Rc1 Re8 12. Nb5 c6 13. a3 Be7 14. Nc3 Ne4 15. Bxe7 Qxe7 16. Qc2 Rac8 17. Bd3 c5 18. Rfe1 Ng5 19. Qe2 Qf6 20. Bb5 Re7 21. Ba6 Nxf3+ 22. gxf3 Bxa6 23. Qxa6 Rce8 24. Kf1 Qxf3 25. Kg1 cxd4 26. Ne2 dxe3 27. Rf1 Nc5 28. Qb5 Ne4 29. Qxd5 exf2+ 30. Rxf2 Qxf2+ 31. Kh1 Qxe2 32. Qb3 Nf2+ 0-1

[Event "North American op 30th"]
[Site "Stillwater"]
[Date "2011.05.27"]
[Round "1"]
[White "Irwin, Philip R"]
[Black "Atalik, Suat"]
[Result "0-1"]
[ECO "A10"]
[WhiteElo "1896"]
[BlackElo "2616"]
[PlyCount "96"]
[EventDate "2011.05.27"]
[EventType "swiss"]
[EventRounds "11"]
[EventCountry "USA"]
[SourceTitle "CBM 142 Extra"]
[Source "ChessBase"]
[SourceDate "2011.06.27"]
[SourceVersion "1"]
[SourceVersionDate "2011.06.27"]
[SourceQuality "1"]

1. c4 b6 2. Nc3 Bb7 3. e4 e5 4. g3 f5 5. Bg2 Nf6 6. d3 fxe4 7. dxe4 Bb4 8. Bg5 Bxc3+ 9. bxc3 d6 10. Nh3 Nbd7 11. 0-0 0-0 12. f3 Ba6 13. Qe2 Qe8 14. Rfd1 Nc5 15. Nf2 Qh5 16. Be3 Nfd7 17. Ng4 Qf7 18. Bxc5 Bxc4 19. Qd2 Nxc5 20. Ne3 Rae8 21. Nxc4 Qxc4 22. Qd5+ Qxd5 23. exd5 g5 24. Re1 Rf6 25. Re3 Ref8 26. Rf1 Kg7 27. c4 h5 28. Rc3 Kh6 29. Re3 a6 30. Bh3 Rg6 31. Bg2 Kg7 32. Ree1 Rgf6 33. Re3 Kf7 34. Ree1 Ke7 35. Re3 Kd8 36. Ree1 Kc8 37. Re3 Kb7 38. Ree1 Rh6 39. Re3 h4 40. Ree1 Ka7 41. Re3 Rhh8 42. Ree1 b5 43. cxb5 h3 44. Bh1 axb5 45. Re3 Kb6 46. Kf2 Ra8 47. Re2 Ra3 48. Rd1 Rha8 0-1

[Event "North American op 28th"]
[Site "Stillwater"]
[Date "2010.05.31"]
[Round "9"]
[White "Irwin, Philip R"]
[Black "Berry, James E"]
[Result "1/2-1/2"]
[ECO "A36"]
[BlackElo "2009"]
[PlyCount "52"]
[EventDate "2010.05.28"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "USA"]
[SourceTitle "CBM 136 Extra"]
[Source "ChessBase"]
[SourceDate "2010.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2010.07.15"]
[SourceQuality "1"]

1. c4 c5 2. g3 g6 3. Bg2 Bg7 4. Nc3 Nc6 5. a3 Nf6 6. Rb1 0-0 7. b4 d6 8. b5 Na5 9. d3 Rb8 10. Nf3 b6 11. 0-0 Bb7 12. Bb2 e6 13. e3 d5 14. Ne5 Qc7 15. Ne2 dxc4 16. Nxc4 Bxg2 17. Kxg2 Nxc4 18. dxc4 Qb7+ 19. Kg1 Qe4 20. Rc1 h5 21. Qc2 Qf3 22. Nf4 Rbd8 23. Rcd1 Ne4 24. Bxg7 Kxg7 25. Rd3 Nf6 26. Qd1 Qa8 1/2-1/2

[Event "North American op 28th"]
[Site "Stillwater"]
[Date "2010.05.31"]
[Round "10"]
[White "Madison, Jeremy M"]
[Black "Irwin, Philip R"]
[Result "1/2-1/2"]
[ECO "B12"]
[WhiteElo "1968"]
[PlyCount "58"]
[EventDate "2010.05.28"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "USA"]
[SourceTitle "CBM 136 Extra"]
[Source "ChessBase"]
[SourceDate "2010.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2010.07.15"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nc3 e6 5. h4 h6 6. Bd3 Bxd3 7. Qxd3 Ne7 8. Nf3 Nd7 9. Bd2 a6 10. Na4 Nc8 11. b4 Ncb6 12. Nb2 Be7 13. g4 Qc7 14. a4 Nf8 15. a5 Nbd7 16. c3 b5 17. axb6 Qxb6 18. Ra5 Bd8 19. Ke2 Qb7 20. Ra2 Ng6 21. h5 Ne7 22. Rha1 Nb8 23. Na4 Nd7 24. Nb2 Nb8 25. Bf4 Nc8 26. Nd2 Qb5 27. Nb3 Be7 28. Qxb5 cxb5 29. Nd3 Nb6 1/2-1/2

[Event "North American op 28th"]
[Site "Stillwater"]
[Date "2010.05.30"]
[Round "8"]
[White "Irwin, Philip R"]
[Black "Steiner, Tim C"]
[Result "1-0"]
[ECO "A26"]
[BlackElo "2147"]
[PlyCount "57"]
[EventDate "2010.05.28"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "USA"]
[SourceTitle "CBM 136 Extra"]
[Source "ChessBase"]
[SourceDate "2010.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2010.07.15"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e4 d6 6. Nge2 e5 7. d3 Nc6 8. 0-0 Be6 9. Nd5 Qd7 10. Bg5 Nh5 11. Qd2 f5 12. Bh6 Nf6 13. Bxg7 Kxg7 14. f4 Rf7 15. b4 Raf8 16. b5 Ne7 17. Nxf6 Rxf6 18. exf5 Bxf5 19. Bxb7 c6 20. bxc6 Nxc6 21. Bxc6 Qxc6 22. Qe3 Re6 23. Nc3 Bh3 24. Rf2 exf4 25. Qxa7+ Kh6 26. Nd5 g5 27. Qd4 Qe8 28. Qc3 f3 29. Nc7 1-0

[Event "North American op 28th"]
[Site "Stillwater"]
[Date "2010.05.29"]
[Round "4"]
[White "Snap, Charles"]
[Black "Irwin, Philip R"]
[Result "0-1"]
[ECO "D00"]
[WhiteElo "1646"]
[PlyCount "68"]
[EventDate "2010.05.28"]
[EventType "swiss"]
[EventRounds "10"]
[EventCountry "USA"]
[SourceTitle "CBM 136 Extra"]
[Source "ChessBase"]
[SourceDate "2010.07.02"]
[SourceVersion "2"]
[SourceVersionDate "2010.07.15"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. f3 exf3 5. Nxf3 Bf5 6. Bc4 e6 7. 0-0 Nf6 8. Ne5 Bg6 9. Bg5 Be7 10. Ne2 Nd5 11. Bd2 Nd7 12. Nxg6 hxg6 13. Bd3 Qc7 14. Ng3 Bd6 15. Qf3 N7f6 16. Be1 Ne7 17. h3 Nf5 18. Nxf5 gxf5 19. Kf2 0-0-0 20. Ke2 Nh5 21. c3 Nf4+ 22. Kd2 Nxd3 23. Qxd3 g6 24. Kc2 e5 25. dxe5 Bxe5 26. Qc4 Rd5 27. Bf2 Rhd8 28. Rae1 Rd2+ 29. Kb1 Kb8 30. Qa4 b6 31. Rxe5 Qxe5 32. Bd4 Qe2 33. Rc1 Qe4+ 34. Ka1 c5 0-1

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "2007.06.10"]
[Round "5"]
[White "Haessel, Dale R"]
[Black "Irwin, Philip R"]
[Result "1-0"]
[ECO "E11"]
[WhiteElo "2151"]
[PlyCount "63"]
[EventDate "2007.06.08"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[SourceTitle "CBM 118 Extra"]
[Source "ChessBase"]
[SourceDate "2007.07.04"]
[SourceVersion "1"]
[SourceVersionDate "2007.07.04"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 Qe7 5. Bg2 Nc6 6. Nf3 0-0 7. 0-0 Bxd2 8. Qxd2 d6 9. Nc3 e5 10. Nd5 Nxd5 11. cxd5 Nxd4 12. Nxd4 exd4 13. Rac1 Re8 14. Rfe1 Bf5 15. Qxd4 Qd7 16. Rc4 a6 17. e3 Rac8 18. Rec1 Re7 19. h4 h6 20. Kh2 Qd8 21. e4 Bd7 22. Qa7 Bb5 23. R4c3 b6 24. Qxb6 cxb6 25. Rxc8 Qxc8 26. Rxc8+ Re8 27. Rc7 f5 28. Bh3 fxe4 29. Be6+ Kh8 30. Rb7 Rf8 31. Kg2 Kh7 32. Rxb6 1-0

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "2006.06.18"]
[Round "5"]
[White "Irwin, Philip R"]
[Black "Hanken, Jerome B"]
[Result "0-1"]
[ECO "D04"]
[BlackElo "2007"]
[PlyCount "72"]
[EventDate "2006.06.16"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. Nf3 g6 2. d4 Bg7 3. e3 Nf6 4. b3 d5 5. Bb2 0-0 6. Nbd2 Nbd7 7. c4 c5 8. Qc2 cxd4 9. Bxd4 dxc4 10. Bxc4 Nb6 11. Be2 Nbd5 12. 0-0 Bf5 13. e4 Nf4 14. Bc4 Be6 15. Rfe1 Bxc4 16. Nxc4 Ne6 17. Be5 Qc8 18. Rac1 Bh6 19. Rcd1 b5 20. Na3 Qb7 21. Qe2 a6 22. Bb2 Nc5 23. e5 Nd5 24. Nd4 e6 25. Qf3 Rac8 26. Nb1 b4 27. Ne2 Qb8 28. Nd2 Nb6 29. Ne4 Nxe4 30. Qxe4 Nd5 31. Qf3 Rc2 32. Rb1 Qb6 33. Bd4 Qa5 34. Qd3 Rfc8 35. Ng3 Rd2 36. Qf3 Rxd4 0-1

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "2006.06.16"]
[Round "2"]
[White "Irwin, Philip R"]
[Black "Gonzalez, Renier"]
[Result "0-1"]
[ECO "A12"]
[BlackElo "2470"]
[PlyCount "54"]
[EventDate "2006.06.16"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[SourceTitle "CBM 112 Extra"]
[Source "ChessBase"]
[SourceDate "2006.07.14"]
[SourceVersion "1"]
[SourceVersionDate "2006.07.14"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 c6 3. g3 Nf6 4. Bg2 Bf5 5. b3 e6 6. Bb2 Nbd7 7. 0-0 h6 8. d3 Be7 9. Nbd2 0-0 10. Re1 Bh7 11. a3 a5 12. Bc3 c5 13. d4 Ne4 14. Nxe4 dxe4 15. Ne5 Nf6 16. e3 Qc7 17. Qe2 Rfd8 18. h4 h5 19. Red1 Bf5 20. Qc2 Bd6 21. Kh2 cxd4 22. exd4 Bxe5 23. dxe5 Ng4+ 24. Kg1 e3 25. Rxd8+ Rxd8 26. Be4 exf2+ 27. Kh1 Ne3 0-1

[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1973.03.12"]
[Round "1"]
[White "Szabo, Laszlo"]
[Black "Irwin, Philip R"]
[Result "1-0"]
[ECO "E90"]
[PlyCount "81"]
[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 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. d4 0-0 6. h3 c5 7. Be3 Na6 8. d5 Nc7 9. Be2 a6 10. a4 Rb8 11. a5 b5 12. axb6 Rxb6 13. Ra2 Nd7 14. 0-0 Rb8 15. Qd2 f5 16. Bh6 fxe4 17. Nxe4 Nf6 18. Bxg7 Nxe4 19. Qe3 Kxg7 20. Qxe4 e5 21. dxe6 Bxe6 22. Rd1 Qf6 23. Rxd6 Rxb2 24. Rxb2 Qxb2 25. Rc6 Rf7 26. Qe5+ Qxe5 27. Nxe5 Re7 28. Rxc5 Bf5 29. Ra5 Ne6 30. Nc6 Re8 31. Rxa6 Nc7 32. Ra7 Rxe2 33. Rxc7+ Kh6 34. c5 Rc2 35. Nd4 Rc1+ 36. Kh2 Be4 37. Re7 Bd5 38. c6 Rc4 39. c7 Bb7 40. Ne6 Bc8 41. Nf8 1-0

