[Event "US Open-72"]
[Site "Ventura"]
[Date "1971.??.??"]
[Round "12"]
[White "De Fotis, Gregory"]
[Black "Riggs, H."]
[Result "1-0"]
[ECO "B20"]
[PlyCount "71"]
[EventDate "1971.08.08"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. g3 c5 2. Bg2 g6 3. e4 Bg7 4. d3 Nc6 5. f4 d6 6. Nf3 Nf6 7. 0-0 0-0 8. Nh4 d5 9. e5 Ne8 10. c3 Be6 11. g4 g5 12. Nf5 Bxf5 13. gxf5 gxf4 14. Bxf4 Nxe5 15. Re1 Nc6 16. Qb3 e5 17. fxe6 fxe6 18. Bg3 c4 19. Qxb7 Na5 20. Qa6 Qb6+ 21. Qxb6 axb6 22. Na3 Kf7 23. dxc4 Nf6 24. cxd5 exd5 25. Rad1 Nc6 26. Rxd5 Ne7 27. Rde5 Rae8 28. Nc4 Nc8 29. Bc6 Rxe5 30. Nxe5+ Kg8 31. Ba4 h5 32. Bh4 Nd6 33. Bb3+ Kh7 34. Bc2+ Kg8 35. Bf2 Rd8 36. Bxb6 1-0

[Event "US Open-72"]
[Site "Ventura"]
[Date "1971.??.??"]
[Round "5"]
[White "Dorsch, Thomas"]
[Black "Riggs, H."]
[Result "1-0"]
[ECO "B40"]
[PlyCount "91"]
[EventDate "1971.08.08"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. d4 e6 3. Nf3 cxd4 4. c3 Nf6 5. Bg5 Be7 6. Bxf6 Bxf6 7. cxd4 Qb6 8. Qd2 Nc6 9. e5 Be7 10. Nc3 d5 11. Be2 0-0 12. 0-0 f6 13. Bd3 Kh8 14. Ne2 fxe5 15. dxe5 Bd7 16. a3 Rxf3 17. gxf3 Nxe5 18. Kh1 Nxf3 19. Qe3 Rf8 20. Nf4 Qd6 21. Qxf3 Rxf4 22. Qg2 e5 23. Rad1 Qh6 24. Be2 d4 25. Rc1 Bc6 26. f3 Rh4 27. Bb5 Bg5 28. Rc2 Bf4 29. Bxc6 bxc6 30. Rff2 d3 31. Rc3 d2 32. Rd3 Qf6 33. h3 h6 34. Rd7 Rh5 35. Qf1 Qh4 36. Kg1 Rg5+ 37. Rg2 Rxg2+ 38. Qxg2 Qe1+ 39. Qf1 Qg3+ 40. Qg2 Qe1+ 41. Qf1 Bh2+ 42. Kg2 Qg3+ 43. Kh1 Qf4 44. Rd8+ Kh7 45. Qd3+ e4 46. Qxd2 1-0

[Event "US Open-72"]
[Site "Ventura"]
[Date "1971.??.??"]
[Round "3"]
[White "Gheorghiu, Florin"]
[Black "Riggs, H."]
[Result "1-0"]
[ECO "A05"]
[PlyCount "89"]
[EventDate "1971.08.08"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. b3 Bg7 4. Bb2 0-0 5. Bg2 c5 6. c4 d5 7. cxd5 Nxd5 8. Bxg7 Kxg7 9. 0-0 Nc6 10. d4 cxd4 11. Nxd4 Ndb4 12. Nxc6 Nxc6 13. Nc3 Qa5 14. Rc1 Rd8 15. Qc2 Bf5 16. Qb2 Kg8 17. Rfd1 Rxd1+ 18. Rxd1 Rd8 19. Rd2 Be6 20. h3 h5 21. h4 Rd4 22. e3 Rxd2 23. Qxd2 Qd8 24. Qxd8+ Nxd8 25. Kf1 Kf8 26. Ke2 Ke8 27. Kd3 Kd7 28. Kd4 b6 29. f4 Nc6+ 30. Bxc6+ Kxc6 31. e4 Bc8 32. Nd5 Kd6 33. e5+ Kd7 34. f5 e6 35. fxg6 fxg6 36. Nf4 Bb7 37. Ke3 g5 38. hxg5 Ke7 39. Nxh5 Kf7 40. Nf4 Bc8 41. Kf3 Bd7 42. Kg4 Kg7 43. Kh5 Be8+ 44. g6 Bd7 45. Kg5 1-0

[Event "US Open-72"]
[Site "Ventura"]
[Date "1971.??.??"]
[Round "9"]
[White "Riggs, H."]
[Black "Formanek, Edward W"]
[Result "0-1"]
[ECO "C16"]
[PlyCount "72"]
[EventDate "1971.08.08"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Ne7 5. a3 Bxc3+ 6. bxc3 b6 7. a4 Ba6 8. Bxa6 Nxa6 9. a5 Nb8 10. Qg4 Nf5 11. Ne2 h5 12. Qf3 Nc6 13. Nf4 Nxa5 14. Nxh5 Nc4 15. g4 Qh4 16. Nf4 Ne7 17. h3 Kd7 18. Ng2 Qh7 19. Qd3 a5 20. Ne3 b5 21. Ba3 Qxd3 22. cxd3 Nxa3 23. Rxa3 b4 24. cxb4 axb4 25. Rxa8 Rxa8 26. 0-0 Nc6 27. Rb1 Ra3 28. Nc2 Rxd3 29. Nxb4 Rxd4 30. Nxc6 Kxc6 31. Rb3 Re4 32. Rc3+ Kb6 33. Rf3 c5 34. Rxf7 c4 35. Rf3 d4 36. Kf1 c3 0-1

[Event "US Open-72"]
[Site "Ventura"]
[Date "1971.??.??"]
[Round "11"]
[White "Riggs, H."]
[Black "Gavora, Les"]
[Result "1-0"]
[ECO "B88"]
[PlyCount "57"]
[EventDate "1971.08.08"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 e6 7. Be3 Be7 8. 0-0 a6 9. Bb3 0-0 10. f4 Qc7 11. f5 Nxd4 12. Bxd4 b5 13. a3 Bd7 14. Qe2 Qb7 15. g4 h6 16. h4 Nh7 17. f6 Bxf6 18. Rxf6 gxf6 19. Rf1 Kg7 20. Qf3 Rg8 21. Bxf6+ Nxf6 22. Qxf6+ Kh7 23. g5 hxg5 24. Qxf7+ Rg7 25. Qh5+ Kg8 26. hxg5 Qb6+ 27. Kg2 Qd8 28. g6 Qe7 29. Nd5 1-0

[Event "US Open-72"]
[Site "Ventura"]
[Date "1971.??.??"]
[Round "8"]
[White "Riggs, H."]
[Black "Nash, Edmund"]
[Result "1-0"]
[ECO "B29"]
[PlyCount "69"]
[EventDate "1971.08.08"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 Nxc3 5. dxc3 d5 6. c4 d4 7. Bd3 Nc6 8. 0-0 Bg4 9. Re1 e6 10. h3 Bh5 11. Bf4 Be7 12. Qe2 Qc7 13. Bh2 Bd8 14. a3 Ne7 15. Be4 Rb8 16. Qd3 Bg6 17. Nd2 Nc8 18. Bxg6 hxg6 19. c3 dxc3 20. Qxc3 Ne7 21. Ne4 Nf5 22. b4 Be7 23. Rad1 0-0 24. g4 Nh6 25. Nf6+ Kh8 26. Rd7 Qc6 27. b5 Qb6 28. Rxe7 gxf6 29. exf6 Rbc8 30. Qe3 Kh7 31. Bf4 Ng8 32. Qg3 Nxf6 33. Qh4+ Nh5 34. gxh5 g5 35. Qxg5 1-0

