[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.06.01"]
[Round "17"]
[White "O'Sullivan, Donal"]
[Black "Durao, Joaquim Manuel"]
[Result "1-0"]
[ECO "D44"]
[PlyCount "71"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 c6 3. d4 e6 4. Nc3 Nf6 5. Bg5 dxc4 6. a4 Bb4 7. e3 b5 8. Qc1 Qb6 9. Bxf6 gxf6 10. Nd2 a6 11. Be2 Bb7 12. 0-0 Nd7 13. b3 cxb3 14. Nxb3 h5 15. Ne4 f5 16. Nec5 Bxc5 17. dxc5 Qc7 18. Rd1 0-0-0 19. Nd4 Nf6 20. axb5 axb5 21. Ra7 Kb8 22. Qa3 Rhg8 23. Ra1 Kc8 24. Nxb5 Rxg2+ 25. Kxg2 cxb5+ 26. Bf3 Bxf3+ 27. Kxf3 Qc6+ 28. Ke2 Nd5 29. Qa6+ Qxa6 30. R1xa6 Nc3+ 31. Kf1 Ne4 32. Rxf7 Kb8 33. Rxe6 Nd2+ 34. Ke2 Ne4 35. Rxf5 Nc3+ 36. Kf3 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.30"]
[Round "16"]
[White "Fairhurst, William Albert"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "D02"]
[PlyCount "37"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Bf4 d5 3. e3 Bg4 4. Nf3 Nbd7 5. Be2 e6 6. 0-0 c5 7. Ne5 Bxe2 8. Qxe2 Bd6 9. Nxf7 Kxf7 10. Bxd6 Qb6 11. dxc5 Qxb2 12. Nd2 b6 13. c6 Ne8 14. cxd7 Nxd6 15. e4 Qe5 16. Nf3 Qh5 17. exd5 Qxd5 18. Rad1 Qc5 19. Rfe1 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.29"]
[Round "15"]
[White "O'Sullivan, Donal"]
[Black "Gligoric, Svetozar"]
[Result "0-1"]
[ECO "E15"]
[PlyCount "76"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 e6 3. d4 b6 4. g3 Ba6 5. Qa4 Be7 6. Bg2 0-0 7. b4 Bxc4 8. Na3 Bd5 9. 0-0 a6 10. Nc2 Nc6 11. Ne5 b5 12. Nxc6 Bxc6 13. Qb3 Bxg2 14. Kxg2 Qc8 15. f3 d6 16. a4 Qb7 17. Be3 Nd5 18. Bf2 Nb6 19. axb5 axb5 20. Na3 c6 21. e4 d5 22. Rfd1 Ra4 23. Nc2 Rfa8 24. e5 Nc4 25. Be1 R8a7 26. f4 Qa8 27. Bc3 Ra2 28. Rxa2 Rxa2 29. Ra1 Rxa1 30. Nxa1 Qa4 31. Kf2 f5 32. Ke2 Qa8 33. Kd3 g5 34. Qc2 Qf8 35. Qb1 Qh6 36. Qg1 Qh5 37. Nc2 Qf3+ 38. Ne3 Kf7 0-1

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.28"]
[Round "14"]
[White "Pachman, Ludek"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E94"]
[PlyCount "61"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Nf3 e5 7. 0-0 exd4 8. Nxd4 Re8 9. f3 Nc6 10. Be3 Ne5 11. Qd2 Be6 12. b3 Qe7 13. Nd5 Bxd5 14. cxd5 Nxd5 15. exd5 Ng4 16. Bf2 Ne3 17. Rfe1 Bxd4 18. Qxd4 Nc2 19. Qd2 Nxe1 20. Rxe1 c6 21. dxc6 bxc6 22. Bf1 Qd7 23. Rd1 Re6 24. Bd4 Rae8 25. Bc3 Qe7 26. Qd4 f6 27. g4 g5 28. Bd3 c5 29. Qd5 Kg7 30. Bc4 Re3 31. Qxg5+ 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.27"]
[Round "13"]
[White "O'Sullivan, Donal"]
[Black "Catozzi, Henry"]
[Result "0-1"]
[ECO "C44"]
[PlyCount "44"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 d3 5. Bxd3 Bc5 6. 0-0 d6 7. b4 Bb6 8. Bf4 Bg4 9. Nbd2 Nge7 10. Qb3 Ng6 11. Bg3 0-0 12. Bb5 Nce5 13. Nd4 a6 14. Bc4 h5 15. f3 Nxc4 16. Nxc4 Be6 17. Kh1 Bxd4 18. cxd4 b5 19. d5 bxc4 20. Qxc4 Bd7 21. Rfc1 h4 22. Bf2 Qg5 0-1

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.25"]
[Round "12"]
[White "Dreyer, Kurt"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "D02"]
[PlyCount "89"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. g3 Bg7 4. Bg2 0-0 5. 0-0 c5 6. c3 d5 7. dxc5 a5 8. Na3 Na6 9. Be3 e6 10. Qa4 Qc7 11. Nb5 Qd8 12. Qh4 Nd7 13. Qxd8 Rxd8 14. Rfd1 Ndxc5 15. Ne1 Bd7 16. Nd4 b5 17. Nb3 Rdc8 18. Nxc5 Nxc5 19. Bxc5 Rxc5 20. e4 Bc6 21. exd5 Bxd5 22. Bxd5 exd5 23. a3 Re8 24. Kf1 Rb8 25. Nc2 Rd8 26. Rd3 Kf8 27. Rad1 Ke7 28. Ne3 Ke6 29. Re1 Kd6 30. Rxd5+ Rxd5 31. Nxd5 Kc5 32. Ne3 b4 33. cxb4+ axb4 34. Rc1+ Kb5 35. axb4 Rd7 36. Rc8 Rb7 37. Rc4 Bxb2 38. Rh4 f5 39. Nc4 Bf6 40. Nd6+ Kc6 41. Nxb7 Bxh4 42. gxh4 Kxb7 43. Ke2 Kc6 44. Kd3 Kb5 45. Kc3 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.24"]
[Round "11"]
[White "O'Sullivan, Donal"]
[Black "Benko, Pal C"]
[Result "0-1"]
[ECO "E81"]
[PlyCount "62"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 c6 7. Bd3 a6 8. a4 e5 9. d5 Ne8 10. b4 a5 11. b5 c5 12. g4 Bf6 13. Nh3 Bh4+ 14. Nf2 f5 15. gxf5 gxf5 16. Rg1+ Kh8 17. Qe2 f4 18. Bd2 Nd7 19. 0-0-0 Ndf6 20. Be1 b6 21. Nh1 Ng8 22. Bxh4 Qxh4 23. Qf2 Qh6 24. Qg2 Ra7 25. Nf2 Rg7 26. Qh1 Rgf7 27. Rg2 Ne7 28. h4 Rg7 29. Rdg1 Rg3 30. Kc2 Rxf3 31. Be2 Rxc3+ 0-1

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.23"]
[Round "10"]
[White "Conrady, Alphonse"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "B60"]
[PlyCount "39"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 Qb6 7. Bxf6 gxf6 8. Nb3 Bg7 9. Nd5 Qd8 10. c3 0-0 11. Bd3 Ne5 12. 0-0 Kh8 13. Bc2 Nc4 14. Qh5 e6 15. Ne3 Nxe3 16. fxe3 Qe7 17. Qh4 h6 18. Rad1 b6 19. e5 dxe5 20. Qe4 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.22"]
[Round "9"]
[White "Schmid, Lothar"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "B65"]
[PlyCount "69"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 Be7 8. 0-0-0 Nxd4 9. Qxd4 0-0 10. f4 h6 11. Bh4 Qa5 12. e5 dxe5 13. Qxe5 Qxe5 14. fxe5 Nd5 15. Bxe7 Nxe7 16. Bb5 a6 17. Bd3 b5 18. Be4 Ra7 19. Rd6 b4 20. Na4 a5 21. Rhd1 Nf5 22. Rd8 Ba6 23. Nc5 Be2 24. R1d2 Bh5 25. Bc6 Rxd8 26. Rxd8+ Kh7 27. Bb7 Ne3 28. Rd4 Bg6 29. c3 bxc3 30. bxc3 h5 31. h3 Nf5 32. Ra4 Ne7 33. Kb2 Bf5 34. Rd4 f6 35. exf6 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.20"]
[Round "8"]
[White "O'Sullivan, Donal"]
[Black "Walther, Edgar"]
[Result "1-0"]
[ECO "B84"]
[PlyCount "105"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e6 7. Be3 Nbd7 8. f4 b5 9. Bf3 Bb7 10. e5 Bxf3 11. Qxf3 dxe5 12. Nc6 Qc7 13. fxe5 Rc8 14. exf6 Qxc6 15. fxg7 Qxf3 16. gxf8Q+ Rxf8 17. gxf3 b4 18. Nd1 Rxc2 19. Rc1 Rxc1 20. Bxc1 Ke7 21. Ne3 Ne5 22. Ke2 a5 23. b3 Rc8 24. f4 Ng6 25. Nc4 a4 26. Bd2 Rb8 27. Kf3 axb3 28. axb3 Nh4+ 29. Ke4 f5+ 30. Kd3 Kf6 31. Bc1 Rd8+ 32. Ke2 Rg8 33. Bb2+ Ke7 34. Bd4 Rg4 35. Bc5+ Kf6 36. Bd6 Ng6 37. Rf1 Rh4 38. Rf2 Kg7 39. Nb2 Kf7 40. Nd3 Ke8 41. Bxb4 Kd7 42. Bd2 Kc6 43. Kf1 Rh3 44. Nc1 Kd5 45. Kg2 Rh4 46. h3 Nf8 47. Bc3 Nd7 48. Bg7 Nc5 49. Rd2+ Kc6 50. Rc2 Kb5 51. Rc4 Nxb3 52. Rc8 Nxc1 53. Kg3 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.19"]
[Round "7"]
[White "Giustolisi, Alberto Mario"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E94"]
[PlyCount "81"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Be2 Nbd7 7. 0-0 e5 8. Be3 Ng4 9. Bg5 f6 10. Bc1 Re8 11. h3 Nh6 12. dxe5 Nxe5 13. Nxe5 dxe5 14. Qxd8 Rxd8 15. Nd5 c6 16. Nxf6+ Bxf6 17. Bxh6 g5 18. Rad1 Be6 19. b3 Kf7 20. Rxd8 Rxd8 21. Rd1 Rxd1+ 22. Bxd1 Be7 23. Bh5+ Kf6 24. Kh2 Bf7 25. Bxf7 Kxf7 26. h4 gxh4 27. Be3 b6 28. f4 exf4 29. Bxf4 Kg6 30. Kh3 Kh5 31. Bb8 a6 32. e5 Kg5 33. Bd6 Bd8 34. e6 Kf6 35. e7 Bxe7 36. Bxe7+ Kxe7 37. Kxh4 Kf6 38. Kh5 Kg7 39. Kg5 c5 40. a4 a5 41. Kf5 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.18"]
[Round "6"]
[White "O'Sullivan, Donal"]
[Black "Plater, Kazimierz"]
[Result "0-1"]
[ECO "B34"]
[PlyCount "52"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nxc6 bxc6 6. Qd4 Nf6 7. e5 Ng8 8. Bd2 Bg7 9. Bc3 Nh6 10. Nd2 0-0 11. Bd3 d6 12. Qf4 d5 13. Nb3 Qc7 14. Nc5 f6 15. Qd2 fxe5 16. f3 Nf5 17. g4 Nh4 18. Be2 Nxf3+ 19. Bxf3 Rxf3 20. h3 e4 21. Bxg7 Qg3+ 22. Kd1 Kxg7 23. Qd4+ e5 24. Qb4 Rf2 25. Kc1 Qe3+ 26. Kb1 Qxh3 0-1

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.17"]
[Round "5"]
[White "Alexander, Conel Hugh O'Donel"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "B88"]
[PlyCount "53"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6 7. 0-0 Be7 8. Be3 0-0 9. Qe2 Nxe4 10. Nxe4 d5 11. Rad1 Qa5 12. Nb3 Qc7 13. Bxd5 exd5 14. Nc3 Be6 15. Nxd5 Bxd5 16. Rxd5 Nb4 17. Rd2 Bf6 18. Qb5 a5 19. c3 Nc6 20. Bc5 Rfe8 21. Bd6 Qc8 22. Nc5 a4 23. Nxa4 Ra5 24. Qb3 Qa8 25. Nb6 Qa6 26. Nd5 Nd4 27. Nxf6+ 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.15"]
[Round "4"]
[White "O'Sullivan, Donal"]
[Black "Dunkelblum, Arthur"]
[Result "0-1"]
[ECO "B40"]
[PlyCount "48"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. e5 Qa5+ 6. Nc3 Qxe5+ 7. Be3 Bb4 8. Bd3 Nd5 9. Qd2 Nc6 10. Nde2 Nxe3 11. fxe3 d5 12. 0-0-0 Bd7 13. Rdf1 Rc8 14. Rf4 0-0 15. Rhf1 Qg5 16. a3 Ba5 17. Qd1 Bc7 18. R4f3 Ne5 19. Rh3 Nxd3+ 20. Qxd3 g6 21. Nf4 Be5 22. Ne4 dxe4 23. Qxd7 Bxf4 24. Rxf4 Qxg2 0-1

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.14"]
[Round "3"]
[White "Llado Lumbera, Jaime"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "B31"]
[PlyCount "71"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. c3 Nf6 5. Qe2 Bg7 6. 0-0 0-0 7. d4 d6 8. e5 Nd7 9. e6 fxe6 10. Ng5 Nb6 11. Nxe6 Bxe6 12. Qxe6+ Rf7 13. dxc5 dxc5 14. Bxc6 bxc6 15. Qxc6 Qd5 16. Qxd5 Nxd5 17. Na3 Rb8 18. Nc4 Nxc3 19. bxc3 Bxc3 20. Be3 Bxa1 21. Rxa1 e6 22. h3 Rb4 23. Rc1 Rc7 24. Kh2 Kg7 25. Bd2 Ra4 26. a3 Rd7 27. Bc3+ Kf8 28. Be5 Rd5 29. f4 g5 30. Rc3 gxf4 31. Bxf4 e5 32. Ne3 Rd7 33. Bxe5 Re4 34. Bg3 Kf7 35. Ng4 Rd5 36. Rf3+ 1-0

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.13"]
[Round "2"]
[White "O'Sullivan, Donal"]
[Black "Van Scheltinga, Theo D"]
[Result "0-1"]
[ECO "E30"]
[PlyCount "76"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 Nc6 5. Bg5 h6 6. Bxf6 Qxf6 7. e4 e5 8. d5 Nd4 9. Be2 Nxe2 10. Qxe2 Bxc3+ 11. bxc3 d6 12. c5 0-0 13. Qe3 Qe7 14. cxd6 cxd6 15. Nd2 b6 16. 0-0 Ba6 17. Rfb1 Rfc8 18. a4 Qg5 19. Qxg5 hxg5 20. a5 Bd3 21. Rb3 b5 22. f3 a6 23. Rc1 Rc5 24. Re1 Bc2 25. Ra3 Rac8 26. Re3 f5 27. exf5 Bxf5 28. Ne4 Bxe4 29. fxe4 Rc4 30. Kf2 Ra4 31. Rxa4 bxa4 32. Kf3 Kf7 33. c4 Rxc4 34. Ra3 g4+ 35. Ke3 g3 36. hxg3 Kg6 37. Ra2 Rb4 38. Kf3 Kg5 0-1

[Event "Zonal Dublin"]
[Site "Dublin"]
[Date "1957.05.12"]
[Round "1"]
[White "Stenborg, Ake"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E87"]
[PlyCount "97"]
[EventDate "1957.05.12"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 e5 7. d5 a5 8. Qd2 Na6 9. Nge2 Ne8 10. g4 f5 11. gxf5 gxf5 12. Bg5 Bf6 13. Rg1 Kh8 14. 0-0-0 Bxg5 15. Rxg5 f4 16. Rg1 Qh4 17. Qe1 Qxe1 18. Rxe1 Rf6 19. Kd2 Rh6 20. Rh1 Rh4 21. Nc1 Nc5 22. Nd3 Nxd3 23. Kxd3 Bd7 24. Re2 Nf6 25. Rg1 Rg8 26. Rxg8+ Kxg8 27. Rf2 Kf7 28. a3 a4 29. Be2 Rh3 30. Kd2 Ng8 31. Bd1 Ne7 32. Nxa4 Rh5 33. Nc3 Rg5 34. b4 Ng6 35. a4 Nh4 36. a5 Ke7 37. b5 Kd8 38. Be2 Bh3 39. Kc2 Rg2 40. Rxg2 Bxg2 41. a6 bxa6 42. bxa6 Kc8 43. Nb5 Bxf3 44. Bxf3 Nxf3 45. Kd3 Nxh2 46. c5 Ng4 47. Nxc7 Kb8 48. Ne8 dxc5 49. d6 1-0

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.13"]
[Round "7"]
[White "Dunphy, William"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "B22"]
[PlyCount "49"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. d4 cxd4 3. c3 d5 4. exd5 Qxd5 5. cxd4 Nc6 6. Nf3 Bg4 7. Be2 e6 8. Nc3 Bb4 9. 0-0 Qd7 10. Be3 Nf6 11. Ne5 Nxe5 12. dxe5 Qxd1 13. Bxd1 Bxd1 14. exf6 Bxc3 15. bxc3 Ba4 16. fxg7 Rg8 17. Bd4 Ke7 18. Bc5+ Kf6 19. Bf8 Bb5 20. Rfe1 Bc6 21. g3 e5 22. Rad1 Kf5 23. h3 h5 24. Rd6 h4 25. g4+ 1-0

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.12"]
[Round "6"]
[White "O'Sullivan, Donal"]
[Black "Reid, John"]
[Result "1-0"]
[ECO "C44"]
[PlyCount "83"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Bc4 d5 6. exd5 Na5 7. Qa4+ c6 8. dxc6 Nxc6 9. 0-0 Bd7 10. Qb3 Be7 11. Bxf7+ Kf8 12. Bxg8 Rxg8 13. Nxc3 Na5 14. Qd5 Bg4 15. Bg5 Bxg5 16. Nxg5 Qxd5 17. Nxd5 h6 18. Ne4 Rd8 19. f3 Bf5 20. Ne3 Bc8 21. Rad1 Ke7 22. Rd5 Rxd5 23. Nxd5+ Ke6 24. Rd1 Rd8 25. Nf4+ Ke7 26. Ng6+ Ke8 27. Nd6+ Rxd6 28. Rxd6 Nc4 29. Rd4 Nxb2 30. Kf2 b5 31. Ne5 a6 32. Nc6 Bf5 33. Rd8+ Kf7 34. Ra8 Bb1 35. Rxa6 Nd3+ 36. Ke3 Ne1 37. Ne5+ Ke7 38. g3 Nc2+ 39. Kd2 Nb4 40. Ra5 Nxa2 41. Rxb5 Bh7 42. Rb7+ 1-0

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.11"]
[Round "5"]
[White "Donner, Jan Hein"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E60"]
[PlyCount "52"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 c5 5. Nf3 0-0 6. 0-0 cxd4 7. Nxd4 Nc6 8. Nc2 Na5 9. Nca3 Qc7 10. Qa4 a6 11. Nc3 d6 12. Qc2 Bd7 13. b3 Rac8 14. Bb2 b5 15. cxb5 axb5 16. Qd2 b4 17. Ncb5 Qd8 18. Qxb4 Rb8 19. Bc3 Nxb3 20. Qxb3 Qb6 21. Rab1 Qa6 22. Rb2 Rfc8 23. Rfb1 Ne8 24. Bxg7 Nxg7 25. e3 Ne6 26. Qd1 Nc5 1-0

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.10"]
[Round "4"]
[White "O'Sullivan, Donal"]
[Black "Stanton, William"]
[Result "1-0"]
[ECO "D61"]
[PlyCount "71"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Nbd7 7. Qc2 c6 8. a3 h6 9. h4 Re8 10. Bd3 dxc4 11. Bxc4 Nd5 12. Bxe7 Qxe7 13. Ne5 Nxe5 14. dxe5 Nxc3 15. Qxc3 b6 16. Rd1 Bb7 17. Rd6 c5 18. Qd3 Red8 19. Bb3 Bc6 20. Bc2 g6 21. h5 Rxd6 22. exd6 Qg5 23. hxg6 fxg6 24. Rh3 Qxg2 25. Rg3 Qh1+ 26. Kd2 Qd5 27. Rxg6+ Kf7 28. Rxh6 Rd8 29. Qxd5 Bxd5 30. e4 Kg7 31. Rh3 Bc6 32. e5 a6 33. Rh7+ Kg8 34. Re7 Bd7 35. Bb3 b5 36. Rxd7 1-0

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.09"]
[Round "3"]
[White "Heidenfeld, Wolfgang"]
[Black "O'Sullivan, Donal"]
[Result "1/2-1/2"]
[ECO "B22"]
[PlyCount "122"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. c3 Nf6 3. e5 Nd5 4. d4 d6 5. exd6 Qxd6 6. Nf3 Nc6 7. c4 Nf6 8. d5 Ne5 9. Be2 g6 10. 0-0 Bg7 11. Nc3 Bd7 12. Kh1 Nxf3 13. Bxf3 0-0 14. Be3 b6 15. h3 Rad8 16. Qd2 Ne8 17. Rfe1 e5 18. dxe6 Bxe6 19. Nd5 Bxd5 20. cxd5 Be5 21. Rad1 Ng7 22. Bg5 f6 23. Rxe5 Qxe5 24. Bf4 Qd4 25. Qxd4 cxd4 26. Bc7 Rd7 27. d6 Rc8 28. Rxd4 Rcxc7 29. dxc7 Rxc7 30. b4 Kf7 31. b5 Nf5 32. Rd8 Ke7 33. Rd3 Ke6 34. g4 Ne7 35. Bd1 Ke5 36. Bb3 Ke4 37. Re3+ Kf4 38. Kg2 f5 39. Rf3+ Ke4 40. Re3+ Kf4 41. Be6 fxg4 42. hxg4 h5 43. gxh5 gxh5 44. Rd3 Rc5 45. Rd7 Nf5 46. a4 Nh4+ 47. Kh3 Nf3 48. Bd5 Ne5 49. Rd8 Nd3 50. Kg2 Nb2 51. Bc6 Rc4 52. Rd5 h4 53. Rh5 Rxa4 54. Rxh4+ Ke5 55. Rxa4 Nxa4 56. Bd7 Nc5 57. Bc8 Kd6 58. Kf3 Kc7 59. Ba6 Nxa6 60. bxa6 Kd6 61. Ke4 Ke6 1/2-1/2

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.08"]
[Round "2"]
[White "O'Sullivan, Donal"]
[Black "O'Kelly de Galway, Alberic"]
[Result "0-1"]
[ECO "A57"]
[PlyCount "74"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 g6 5. Nc3 Bg7 6. e4 d6 7. Bd3 0-0 8. Nge2 a6 9. 0-0 axb5 10. Bxb5 Ba6 11. Qd3 Qb6 12. h3 Bxb5 13. Qxb5 Qxb5 14. Nxb5 Nxe4 15. f3 Nf6 16. Nec3 Na6 17. Re1 Rfe8 18. Bf4 Kf8 19. Re2 Nd7 20. Rae1 Ne5 21. Bg3 Reb8 22. f4 Nd3 23. Rb1 Nab4 24. Rd1 Nxb2 25. Rxb2 Rxb5 26. Nxb5 Bxb2 27. a3 Na6 28. Be1 Rb8 29. a4 Ke8 30. Ba5 Kd7 31. Na7 Nb4 32. Nb5 Ra8 33. Bxb4 cxb4 34. Rb1 Bc3 35. Nxc3 bxc3 36. Ra1 c2 37. Kf2 Rxa4 0-1

[Event "Dublin Tostal International"]
[Site "Dublin"]
[Date "1956.05.07"]
[Round "1"]
[White "O'Sullivan, Donal"]
[Black "Golombek, Harry"]
[Result "0-1"]
[ECO "E21"]
[PlyCount "78"]
[EventDate "1956.05.07"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 b6 3. Nc3 Bb7 4. d4 e6 5. Bg5 h6 6. Bxf6 Qxf6 7. e4 Bb4 8. Bd3 c5 9. e5 Qe7 10. 0-0 cxd4 11. Nb5 Qd8 12. a3 Be7 13. Nd6+ Bxd6 14. exd6 Qf6 15. Re1 Bxf3 16. Qxf3 Qxf3 17. gxf3 Nc6 18. Rad1 Rc8 19. b4 0-0 20. f4 f5 21. Bf1 Kf7 22. Bg2 g5 23. Bxc6 Rxc6 24. Rxd4 Rfc8 25. fxg5 hxg5 26. Rc1 e5 27. Rd5 Ke6 28. Re1 e4 29. f3 Rxc4 30. fxe4 Rxe4 31. Rxe4+ Kxd5 32. Re3 Kxd6 33. h3 Rc4 34. Rg3 g4 35. h4 Ke5 36. Re3+ Kf4 37. Rd3 a5 38. Rxd7 axb4 39. axb4 Kg3 0-1

[Event "Cork An Tostal 2nd"]
[Site "Cork"]
[Date "1955.05.13"]
[Round "2"]
[White "O'Sullivan, Donal"]
[Black "O'Kelly de Galway, Alberic"]
[Result "0-1"]
[ECO "E18"]
[PlyCount "64"]
[EventDate "1955.05.12"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 e6 3. d4 b6 4. g3 Bb7 5. Bg2 Be7 6. Nc3 0-0 7. 0-0 c6 8. e4 d5 9. cxd5 cxd5 10. exd5 Nxd5 11. Ne5 Nxc3 12. bxc3 Bxg2 13. Kxg2 Qd5+ 14. Qf3 Qxf3+ 15. Kxf3 Rc8 16. Bb2 Nc6 17. Rfe1 Na5 18. Rad1 Bd6 19. Nd3 b5 20. Re2 Nc4 21. Bc1 Nb6 22. Rc2 Rc7 23. Bf4 Bxf4 24. Nxf4 Rac8 25. Rdc1 b4 26. Ne2 Rc4 27. a3 bxa3 28. Ra2 Ra4 29. Rb1 Kf8 30. Rb4 Rc4 31. Rxc4 Nxc4 32. Nf4 Nd2+ 0-1

[Event "An Tostal"]
[Site "Cork"]
[Date "1955.??.??"]
[Round "?"]
[White "O'Sullivan, Donal"]
[Black "Bernstein, Ossip Samuel"]
[Result "1/2-1/2"]
[ECO "A12"]
[PlyCount "99"]
[EventDate "1955.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. Nf3 d5 2. c4 c6 3. b3 Bf5 4. Nc3 d4 5. Nh4 dxc3 6. Nxf5 g6 7. Ne3 Bg7 8. Rb1 Qa5 9. Qc2 Na6 10. dxc3 Bxc3+ 11. Bd2 Bxd2+ 12. Qxd2 Nb4 13. Rc1 Nf6 14. Nc2 Nxc2+ 15. Rxc2 Qa3 16. Qc3 a5 17. e3 0-0 18. Bd3 Rfd8 19. Rd2 Rd6 20. 0-0 Rad8 21. Rfd1 Qb4 22. Qxb4 axb4 23. f3 e5 24. e4 Nh5 25. g3 Ng7 26. Kf2 h5 27. f4 h4 28. Ke3 hxg3 29. hxg3 exf4+ 30. gxf4 Ne6 31. f5 gxf5 32. exf5 Nc5 33. Bc2 Rxd2 34. Rxd2 Rxd2 35. Kxd2 Kg7 36. Ke3 Kh6 37. Kd4 Nd7 38. c5 Kg5 39. Kc4 Nf6 40. Kxb4 Nd5+ 41. Ka5 Kf4 42. b4 Ke5 43. b5 Kd4 44. bxc6 bxc6 45. a3 Kxc5 46. Ka6 Kd4 47. Kb7 Ne3 48. Bb3 c5 49. Bxf7 Nxf5 50. Bg6 1/2-1/2

[Event "An Tostal"]
[Site "Cork"]
[Date "1955.??.??"]
[Round "?"]
[White "Van Scheltinga, Theo D"]
[Black "O'Sullivan, Donal"]
[Result "1/2-1/2"]
[ECO "E85"]
[PlyCount "110"]
[EventDate "1955.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 e5 7. Nge2 Nh5 8. g4 Qf6 9. Bg2 Nf4 10. Nxf4 exf4 11. Nd5 Qh4+ 12. Bf2 Qd8 13. Nxf4 f5 14. gxf5 gxf5 15. Nh5 fxe4 16. Nxg7 Kxg7 17. fxe4 Nc6 18. Qd2 Bg4 19. 0-0 Qf6 20. Be3 Qg6 21. Kh1 Kh8 22. Rf2 Rf7 23. Rxf7 Qxf7 24. Rf1 Qg7 25. Bh6 Qg6 26. Bg5 Kg8 27. Qf4 Be2 28. Rf2 Nxd4 29. Bh3 Bf3+ 30. Bg2 Rf8 31. Qh4 Bxg2+ 32. Kxg2 Rxf2+ 33. Kxf2 Qf7+ 34. Ke3 Nf3 35. Qg3 Nxg5 36. Qxg5+ Kf8 37. Qd8+ Kg7 38. b3 Kg6 39. Qb8 Qg7 40. Kd3 Qf7 41. Qxa7 Qf1+ 42. Kc3 Qe1+ 43. Kb2 Qxe4 44. Qf2 Qe5+ 45. Kc2 c6 46. b4 Qe4+ 47. Kc3 Qe5+ 48. Kd3 Qa1 49. Qc2 Kf7 50. b5 c5 51. Qe2 Qd4+ 52. Kc2 b6 53. a4 Qf4 54. Kb3 Qf5 55. Kc3 Qf6+ 1/2-1/2

[Event "IRL-ch"]
[Site "Belfast"]
[Date "1954.??.??"]
[Round "7"]
[White "Mulcahy, Noel"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E85"]
[PlyCount "49"]
[EventDate "1954.??.??"]
[EventType "tourn"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 e5 7. Nge2 Nbd7 8. Qd2 Nb6 9. Ng3 exd4 10. Bxd4 Be6 11. Nd5 c6 12. Nxb6 axb6 13. Be2 Qc7 14. 0-0 h5 15. Qe3 Nd7 16. Bxg7 Kxg7 17. Nxh5+ gxh5 18. Qg5+ Kh7 19. Qxh5+ Kg7 20. Qg5+ Kh7 21. Qh5+ Kg7 22. f4 f5 23. Qg5+ Kh7 24. Rf3 fxe4 25. Rg3 1-0

[Event "IRL-ch"]
[Site "Belfast"]
[Date "1950.??.??"]
[Round "1"]
[White "Peebles, JD."]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E60"]
[PlyCount "75"]
[EventDate "1950.??.??"]
[EventType "tourn"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 c5 5. e3 0-0 6. Bg2 d6 7. Nc3 Bg4 8. Qb3 Bc8 9. 0-0 Nc6 10. dxc5 dxc5 11. Rd1 Qc7 12. Qc2 Be6 13. Qe2 Na5 14. Nd5 Nxd5 15. cxd5 Bd7 16. e4 Ba4 17. Bf4 Qd7 18. Re1 Bb5 19. Qc2 Nc4 20. Rab1 Rad8 21. b3 Na3 22. Qc1 Nxb1 23. Qxb1 e6 24. Ne5 Qe7 25. h4 Rfe8 26. Nf3 h6 27. Qc1 Kh7 28. d6 Qd7 29. e5 b6 30. Qc2 Bc6 31. h5 Bxf3 32. Bxf3 Kh8 33. hxg6 f6 34. exf6 Bxf6 35. Qd2 Bg7 36. Kg2 e5 37. Bxe5 Qf5 38. Qxh6+ 1-0

[Event "IRL-ch"]
[Site "Galway"]
[Date "1949.09.19"]
[Round "3"]
[White "Kennedy, Patrick"]
[Black "O'Sullivan, Donal"]
[Result "1-0"]
[ECO "E60"]
[PlyCount "63"]
[EventDate "1949.07.??"]
[EventType "simul"]
[EventRounds "7"]
[EventCountry "IRL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. g3 c5 5. d5 d6 6. Bg2 Nbd7 7. Qc2 Ne5 8. b3 0-0 9. Bb2 Bd7 10. Nf3 Nxf3+ 11. exf3 e6 12. dxe6 fxe6 13. 0-0 d5 14. Rfe1 Re8 15. f4 d4 16. Ne4 Bc6 17. Nxc5 Bxg2 18. Kxg2 Qd6 19. Nd3 Rac8 20. Rad1 Nd5 21. Ne5 Bxe5 22. Rxe5 Nb4 23. Qe4 Nc6 24. Rg5 Rcd8 25. h4 e5 26. fxe5 Qe6 27. h5 Qe7 28. f4 Qxg5 29. fxg5 Rxe5 30. Qg4 Rde8 31. Bxd4 Re4 32. Qd7 1-0

