[Event "IRL-ch"]
[Site "Cork"]
[Date "1973.07.14"]
[Round "8"]
[White "McMahon, Frank J"]
[Black "O'Briain, Padraig"]
[Result "1/2-1/2"]
[ECO "B34"]
[PlyCount "48"]
[EventDate "1973.07.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Bc4 Bg7 6. Nxc6 bxc6 7. Qf3 Nf6 8. Nc3 0-0 9. Bd2 d6 10. h3 a5 11. 0-0 Nd7 12. Bf4 a4 13. Rab1 Qa5 14. Ne2 Rb8 15. c3 c5 16. Rfd1 Nb6 17. Bd3 Be6 18. b4 axb3 19. axb3 Nd7 20. Bc2 Rb7 21. e5 d5 22. c4 Nxe5 23. Bxe5 Bxe5 24. cxd5 Bc8 1/2-1/2

[Event "IRL-ch"]
[Site "Cork"]
[Date "1973.07.12"]
[Round "6"]
[White "Henry, Paul Gerard"]
[Black "O'Briain, Padraig"]
[Result "1-0"]
[ECO "A15"]
[PlyCount "67"]
[EventDate "1973.07.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. b3 e5 2. Bb2 d6 3. g3 Nf6 4. Bg2 g6 5. c4 Bg7 6. Nc3 0-0 7. Nf3 c6 8. 0-0 a5 9. Qc2 Na6 10. Rad1 Bf5 11. e4 Bg4 12. h3 Bxf3 13. Bxf3 Re8 14. Rfe1 Nd7 15. Ne2 a4 16. Bc3 axb3 17. axb3 c5 18. Bg2 b5 19. cxb5 Nc7 20. Qd3 Bf8 21. Bb2 Qb8 22. Nc3 Nb6 23. Bf1 Qb7 24. Ra1 Ne6 25. Ra6 Nc7 26. Rxa8 Rxa8 27. Ra1 Rxa1 28. Bxa1 Qa7 29. Na4 Nca8 30. Qc2 Nxa4 31. bxa4 Nb6 32. Bc3 Qxa4 33. Qxa4 Nxa4 34. Ba5 1-0

[Event "IRL-ch"]
[Site "Cork"]
[Date "1973.07.11"]
[Round "5"]
[White "O'Briain, Padraig"]
[Black "MacGrillen, Hugh"]
[Result "0-1"]
[ECO "E62"]
[BlackElo "2290"]
[PlyCount "40"]
[EventDate "1973.07.07"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. Nf3 d6 2. d4 Nf6 3. g3 g6 4. c4 Bg7 5. Bg2 0-0 6. Nc3 c6 7. h3 a6 8. 0-0 b5 9. cxb5 axb5 10. Qc2 b4 11. Nd1 Qb6 12. b3 Bf5 13. Qd2 Be4 14. Bb2 Nbd7 15. Ne1 Bxg2 16. Kxg2 c5 17. Ne3 Ne4 18. Qd3 Qb7 19. Kh2 cxd4 20. Bxd4 Ndc5 0-1

[Event "IRL-ch"]
[Site "Cork"]
[Date "1973.07.10"]
[Round "4"]
[White "O'Briain, Padraig"]
[Black "Doyle, Tony"]
[Result "1-0"]
[ECO "D71"]
[PlyCount "47"]
[EventDate "1973.07.07"]
[EventType "swiss"]
[EventRounds "9"]
[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. g3 Bg7 4. Bg2 d5 5. cxd5 Nxd5 6. Nc3 Nxc3 7. bxc3 c5 8. e3 0-0 9. Ne2 Qc7 10. 0-0 Rd8 11. Ba3 Nd7 12. Nf4 Qa5 13. Qb3 e5 14. Nd5 exd4 15. exd4 Rb8 16. Rfe1 Bf8 17. Ne7+ Kg7 18. Bd5 Nb6 19. c4 Nxd5 20. Nxd5 cxd4 21. Bxf8+ Kxf8 22. Qf3 Qa6 23. Qf4 Be6 24. Qh6+ 1-0

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.16"]
[Round "9"]
[White "Dennehy, Tony"]
[Black "O'Briain, Padraig"]
[Result "1/2-1/2"]
[ECO "B05"]
[PlyCount "55"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bg4 5. Be2 e6 6. 0-0 Be7 7. Re1 0-0 8. c4 Nb6 9. Nc3 Nc6 10. exd6 cxd6 11. b3 d5 12. Be3 Rc8 13. c5 Nd7 14. a3 Bf6 15. b4 Bxf3 16. Bxf3 b6 17. b5 Nxd4 18. Bxd4 e5 19. Nxd5 exd4 20. Nxf6+ Nxf6 21. c6 Qd6 22. Qd3 g6 23. Red1 Rfd8 24. Rac1 Qe5 25. a4 Nh5 26. g3 Ng7 27. Rc4 Ne6 28. Qe4 1/2-1/2

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.15"]
[Round "8"]
[White "Doyle, Tony"]
[Black "O'Briain, Padraig"]
[Result "1/2-1/2"]
[ECO "B11"]
[PlyCount "31"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 4. h4 Bxf3 5. Qxf3 Nf6 6. e5 Nfd7 7. d4 e6 8. Qg3 Qb6 9. f4 g6 10. Qd3 c5 11. Be3 Nc6 12. dxc5 Bxc5 13. Bxc5 Nxc5 14. Qb5 0-0 15. 0-0-0 d4 16. Na4 1/2-1/2

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.14"]
[Round "7"]
[White "O'Briain, Padraig"]
[Black "McDonough, Gerry"]
[Result "1-0"]
[ECO "B50"]
[PlyCount "57"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 4. e5 Ng4 5. Bb5+ Bd7 6. e6 fxe6 7. Ng5 Nf6 8. Nxe6 Qc8 9. 0-0 Nc6 10. Nf4 a6 11. Bc4 e6 12. Na4 d5 13. Bxd5 exd5 14. Nb6 Qd8 15. Nxa8 Qxa8 16. Nxd5 Bd6 17. d4 cxd4 18. Re1+ Kd8 19. Bg5 Be7 20. Nxe7 Nxe7 21. Qxd4 Nc6 22. Bxf6+ gxf6 23. Qxf6+ Kc7 24. Qf4+ Kc8 25. Rad1 Qa7 26. Rxd7 Kxd7 27. Qg4+ Kd8 28. Rd1+ Ke8 29. Qc8+ 1-0

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.13"]
[Round "6"]
[White "Quigley, Colm"]
[Black "O'Briain, Padraig"]
[Result "1/2-1/2"]
[ECO "C43"]
[PlyCount "45"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 d5 6. exd6 Nxd6 7. Bd3 Nc6 8. Qf4 Be7 9. Nc3 Be6 10. Bd2 h6 11. a3 a6 12. h4 Qd7 13. Ne2 0-0-0 14. 0-0-0 Bf6 15. Bc3 Bxc3 16. Nxc3 Bf5 17. Ne4 Bxe4 18. Bxe4 Rhe8 19. Bxc6 Qxc6 20. Qg4+ Kb8 21. Qxg7 Qc4 22. Kb1 Re2 23. Nd2 1/2-1/2

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.12"]
[Round "5"]
[White "O'Briain, Padraig"]
[Black "Spillane, Anthony"]
[Result "1/2-1/2"]
[ECO "C84"]
[PlyCount "56"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Nc3 b5 7. Bb3 d6 8. a4 Rb8 9. axb5 axb5 10. h3 Be6 11. Bxe6 fxe6 12. d4 exd4 13. Nxd4 Nxd4 14. Qxd4 c5 15. Qd3 Qb6 16. e5 dxe5 17. Qxb5+ Qxb5 18. Nxb5 Rxb5 19. Ra8+ Bd8 20. Rd1 Ke7 21. Ra7+ Ke8 22. Rxd8+ Kxd8 23. Ra8+ Kd7 24. Rxh8 c4 25. Kh2 g6 26. Ra8 Rb7 27. Ra4 Rc7 28. Bd2 Nh5 1/2-1/2

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.11"]
[Round "4"]
[White "Cox, David"]
[Black "O'Briain, Padraig"]
[Result "1-0"]
[ECO "C44"]
[PlyCount "61"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 dxc3 5. Bc4 Nf6 6. Nxc3 Bb4 7. e5 d5 8. exf6 dxc4 9. Qxd8+ Nxd8 10. fxg7 Rg8 11. Bh6 Ne6 12. 0-0-0 Bxc3 13. bxc3 Nxg7 14. Nd4 Bd7 15. Bg5 Ne6 16. h4 Nxg5 17. hxg5 0-0-0 18. f4 c5 19. Nf3 Bf5 20. Ne5 Rxd1+ 21. Rxd1 Be6 22. g4 Rd8 23. Rh1 Rh8 24. Rh6 Bd5 25. g6 f6 26. f5 fxe5 27. f6 Rf8 28. gxh7 Rh8 29. g5 Bf7 30. g6 Bxg6 31. Rxg6 1-0

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.10"]
[Round "3"]
[White "O'Briain, Padraig"]
[Black "O'Riordan, Kenneth"]
[Result "1/2-1/2"]
[ECO "C47"]
[PlyCount "34"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. d4 exd4 5. Nd5 Be7 6. Bf4 d6 7. Nxd4 Nxd4 8. Qxd4 Nxd5 9. exd5 Bf6 10. Qe3+ Qe7 11. Qxe7+ Bxe7 12. 0-0-0 0-0 13. Bd3 Bd7 14. h4 Rfe8 15. f3 Bf6 16. g4 Be5 17. Bd2 Bd4 1/2-1/2

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.09"]
[Round "2"]
[White "Egan, Colm"]
[Black "O'Briain, Padraig"]
[Result "0-1"]
[ECO "B12"]
[PlyCount "68"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. e5 Bf5 4. Ne2 e6 5. Ng3 Bg6 6. h4 h6 7. h5 Bh7 8. Bd3 Bxd3 9. Qxd3 Qb6 10. Nd2 c5 11. c3 Nc6 12. Ne2 cxd4 13. cxd4 Nb4 14. Qc3 Qa6 15. Nf4 b6 16. Kd1 Rc8 17. Qa3 Qxa3 18. bxa3 Nc6 19. Rb1 Nxd4 20. Rh3 Ne7 21. a4 Ndc6 22. Nd3 Na5 23. Nb3 Nec6 24. Bd2 Nc4 25. Bf4 Be7 26. Rg3 Kf8 27. Ke2 f6 28. exf6 Bxf6 29. Rg6 Kf7 30. Kf1 e5 31. Bg3 e4 32. Ne1 Ne7 33. Rg4 Nf5 34. Rd1 Nce3+ 0-1

[Event "IRL-ch"]
[Site "Dublin"]
[Date "1972.07.08"]
[Round "1"]
[White "O'Briain, Padraig"]
[Black "Heidenfeld, Wolfgang"]
[Result "0-1"]
[ECO "A11"]
[BlackElo "2250"]
[PlyCount "70"]
[EventDate "1972.07.08"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "IRL"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. g3 d5 2. Bg2 Nf6 3. Nf3 g6 4. c4 c6 5. b3 Bg7 6. Bb2 0-0 7. 0-0 Nbd7 8. d3 Re8 9. Qc2 e5 10. e3 dxc4 11. bxc4 Qc7 12. Nbd2 Nf8 13. Rac1 Bf5 14. Nh4 Bd7 15. d4 exd4 16. exd4 Rad8 17. Ndf3 Bc8 18. Rfd1 Bg4 19. h3 Bc8 20. Ne5 Nh5 21. Nhf3 h6 22. Qb3 c5 23. Qa3 cxd4 24. Bxd4 Ne6 25. Bb2 b6 26. Ng4 Ng5 27. Bxg7 Kxg7 28. Qc3+ Kh7 29. Rd5 Ne4 30. Qb2 f5 31. Nge5 Nhf6 32. Rxd8 Rxd8 33. Rf1 Be6 34. Nh4 g5 35. Nhg6 Rg8 0-1

