[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.04.08"]
[Round "9"]
[White "Kudrin, Sergey"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "B88"]
[WhiteElo "2425"]
[BlackElo "2480"]
[PlyCount "69"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 e6 7. Bb3 a6 8. f4 Be7 9. Be3 0-0 10. 0-0 Nxd4 11. Bxd4 b5 12. e5 dxe5 13. fxe5 Nd7 14. Ne4 Bb7 15. Nd6 Bxd6 16. exd6 Qg5 17. Rf2 e5 18. Bc3 Nf6 19. Qf1 b4 20. Bxb4 Qh4 21. Ba5 Ng4 22. h3 Nxf2 23. Qxf2 Qg5 24. Rd1 e4 25. Bb6 Kh8 26. d7 f5 27. Bd5 Bxd5 28. Rxd5 Qc1+ 29. Kh2 Qxb2 30. Qd4 Qxa2 31. c4 h6 32. d8Q Raxd8 33. Rxd8 Rxd8 34. Qxd8+ Kh7 35. Qc8 1-0

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.04.07"]
[Round "8"]
[White "Dahlberg, Ivars A"]
[Black "Henley, Ron W"]
[Result "0-1"]
[ECO "E14"]
[WhiteElo "2480"]
[BlackElo "2440"]
[PlyCount "82"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 Nf6 2. Nf3 c5 3. Nc3 b6 4. e3 e6 5. d4 d6 6. d5 e5 7. e4 Be7 8. Be2 Nbd7 9. a3 g6 10. 0-0 Nh5 11. Ne1 Nf4 12. Bxf4 exf4 13. Nd3 g5 14. Bg4 Bf6 15. Nb5 Ke7 16. Bxd7 Bxd7 17. Re1 Bxb5 18. cxb5 Bd4 19. Qg4 Qg8 20. e5 Qg6 21. Rad1 Rhe8 22. h4 h5 23. Qf3 gxh4 24. exd6+ Kxd6 25. Qxf4+ Kd7 26. d6 Qf6 27. Qd2 Rxe1+ 28. Nxe1 Rg8 29. b4 h3 30. bxc5 bxc5 31. Qe2 Bxf2+ 32. Kh1 Re8 33. Qxh5 hxg2+ 34. Kxg2 Rxe1 35. Rxe1 Bxe1 36. Qxc5 Qf2+ 37. Qxf2 Bxf2 38. Kxf2 Kxd6 39. Kf3 Kc5 40. Kf4 Kxb5 41. Kf5 Ka4 0-1

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.04.06"]
[Round "7"]
[White "Gligoric, Svetozar"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "D48"]
[WhiteElo "2530"]
[BlackElo "2480"]
[PlyCount "73"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. d5 Nb6 11. 0-0 exd5 12. e5 Nfd7 13. Re1 Be7 14. e6 fxe6 15. Rxe6 0-0 16. Qe2 c4 17. Rxe7 cxd3 18. Qe6+ Kh8 19. Ng5 Nf6 20. Nf7+ Kg8 21. Nxd8+ Bxe6 22. Nxe6 Rae8 23. Rxg7+ Kh8 24. Rg3 Rxe6 25. Bh6 Rf7 26. Re3 Rxe3 27. Bxe3 Nc4 28. Bd4 Kg8 29. b3 Na5 30. Rd1 Nc6 31. Bxf6 Rxf6 32. Nxd5 Re6 33. Nf4 Re4 34. Nxd3 Re2 35. a3 Ra2 36. Nb4 Ne5 37. Nxa2 1-0

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.04.05"]
[Round "6"]
[White "Dahlberg, Ivars A"]
[Black "Burger, Karl"]
[Result "1-0"]
[ECO "A19"]
[WhiteElo "2480"]
[BlackElo "2405"]
[PlyCount "53"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. e4 c5 4. e5 Ng8 5. Nf3 Nc6 6. d4 cxd4 7. Nxd4 Nxe5 8. Qa4 Qb6 9. Ndb5 a6 10. Be3 Qc6 11. Bd4 f6 12. f4 axb5 13. Qxa8 Nxc4 14. Nxb5 Bb4+ 15. Kf2 Ne7 16. Qa4 Nd5 17. Bxc4 Nxf4 18. Qxb4 Qxg2+ 19. Ke3 Qh3+ 20. Kd2 Qg2+ 21. Kc3 Qf3+ 22. Kc2 d5 23. Nd6+ Kd7 24. Bb5+ Kc7 25. Rhf1 Qg2+ 26. Rf2 Qg6+ 27. Kb3 1-0

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.04.02"]
[Round "5"]
[White "Dahlberg, Ivars A"]
[Black "Donaldson, John W"]
[Result "1/2-1/2"]
[ECO "B36"]
[WhiteElo "2480"]
[BlackElo "2340"]
[PlyCount "58"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. e4 Nf6 6. Nc3 d6 7. Be2 Nxd4 8. Qxd4 Bg7 9. Bg5 0-0 10. Qe3 a6 11. 0-0 Be6 12. Rac1 Qa5 13. b3 Rfc8 14. Na4 Rab8 15. c5 Qb4 16. Bf3 Re8 17. cxd6 exd6 18. Qb6 Qxb6 19. Nxb6 Nd7 20. Be3 Nxb6 21. Bxb6 Rbc8 22. g3 Bd7 23. Bg2 Rxc1 24. Rxc1 Bc6 25. Rd1 Bf8 26. f3 Be7 27. Bc7 d5 28. exd5 Bc5+ 29. Kh1 Bxd5 1/2-1/2

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.04.01"]
[Round "4"]
[White "Sosonko, Gennadi"]
[Black "Dahlberg, Ivars A"]
[Result "1/2-1/2"]
[ECO "E09"]
[WhiteElo "2595"]
[BlackElo "2480"]
[PlyCount "38"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 0-0 6. 0-0 Nbd7 7. Qc2 c6 8. b3 b6 9. Rd1 Ba6 10. Nbd2 c5 11. e4 cxd4 12. Nxd4 Re8 13. exd5 exd5 14. Qf5 g6 15. Qh3 Nc5 16. N2f3 dxc4 17. Bh6 c3 18. b4 Nce4 19. b5 c2 1/2-1/2

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.03.31"]
[Round "3"]
[White "Davies, Nigel Rodney"]
[Black "Dahlberg, Ivars A"]
[Result "0-1"]
[ECO "C15"]
[WhiteElo "2360"]
[BlackElo "2480"]
[PlyCount "62"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Nge2 dxe4 5. a3 Be7 6. Nxe4 Nf6 7. N2g3 Nc6 8. c3 0-0 9. Nxf6+ Bxf6 10. f4 b6 11. Bd3 g6 12. Ne4 Bh4+ 13. g3 Be7 14. h4 Bb7 15. Qe2 h5 16. Be3 Qd5 17. g4 Na5 18. Kf2 hxg4 19. Qxg4 Qf5 20. Qf3 Kg7 21. Rag1 Rh8 22. h5 Nc4 23. Bc1 c5 24. Qe2 Qd5 25. Ng5 Nd6 26. h6+ Kf8 27. dxc5 Nf5 28. Ke1 Ng3 29. Rxg3 Qxh1+ 30. Kd2 Rxh6 31. Qe5 Qh2+ 0-1

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.03.30"]
[Round "2"]
[White "Dahlberg, Ivars A"]
[Black "Kortschnoj, Viktor Lvovich"]
[Result "0-1"]
[ECO "E11"]
[WhiteElo "2480"]
[BlackElo "2650"]
[PlyCount "44"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Nbd2 c5 5. a3 Bxd2+ 6. Qxd2 b6 7. e3 Bb7 8. Be2 Nc6 9. 0-0 0-0 10. b3 Ne4 11. Qc2 f5 12. Rd1 Ne7 13. dxc5 bxc5 14. Bb2 d6 15. Nd2 Ng6 16. Bf3 Nh4 17. Bxe4 fxe4 18. Nxe4 Nxg2 19. Qc3 Qe7 20. Nxd6 Bf3 21. Rd2 Nh4 22. Qe5 Be2 0-1

[Event "Lone Pine op Louis D. Statham Masters"]
[Site "Lone Pine"]
[Date "1981.03.29"]
[Round "1"]
[White "McCambridge, Vincent"]
[Black "Dahlberg, Ivars A"]
[Result "0-1"]
[ECO "C00"]
[BlackElo "2480"]
[PlyCount "38"]
[EventDate "1981.03.29"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e6 2. d3 d5 3. Nd2 Nf6 4. Ngf3 c5 5. g3 Nc6 6. Bg2 Be7 7. 0-0 Qc7 8. Re1 b6 9. Qe2 Ba6 10. e5 Nd7 11. c4 Nf8 12. Nf1 h6 13. Ne3 0-0-0 14. a3 g5 15. b4 dxc4 16. dxc4 Nd4 17. Qb2 Ng6 18. Nxd4 cxd4 19. Nc2 Nxe5 0-1

[Event "USA"]
[Site "USA"]
[Date "1981.??.??"]
[Round "?"]
[White "Dahlberg, Ivars A"]
[Black "Browne, Walter Shawn"]
[Result "0-1"]
[ECO "E12"]
[WhiteElo "2480"]
[BlackElo "2555"]
[PlyCount "76"]
[EventDate "1981.??.??"]
[EventType "game"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. a3 c5 5. d5 Ba6 6. Qc2 exd5 7. cxd5 Bb7 8. e4 Qe7 9. Bd3 Nxd5 10. 0-0 Nc7 11. Nc3 Ne6 12. Be3 Nc6 13. e5 f6 14. Bxh7 Nxe5 15. Nxe5 fxe5 16. Bg6+ Kd8 17. Bf5 Qh4 18. h3 Nd4 19. Bxd4 exd4 20. Ne4 Qf4 21. Ng3 Bd6 22. Rfe1 Kc7 23. b4 Rhe8 24. bxc5 Bxc5 25. a4 d3 26. Bxd3 Qxg3 27. Qxc5+ bxc5 28. fxg3 d5 29. Bg6 Rxe1+ 30. Rxe1 Kd6 31. Rf1 d4 32. Rf7 Bd5 33. Rxg7 c4 34. Kf2 Rb8 35. g4 Rb2+ 36. Kg3 d3 37. g5 d2 38. Bh5 c3 0-1

[Event "Edward Lasker International Masters "]
[Site "Los Angeles"]
[Date "1981.??.??"]
[Round "?"]
[White "Savereide, Diane"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "B89"]
[WhiteElo "2255"]
[BlackElo "2385"]
[PlyCount "57"]
[EventDate "1981.??.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bc4 e6 7. Be3 a6 8. Bb3 Be7 9. Qe2 Bd7 10. 0-0-0 Rc8 11. f4 Qc7 12. g4 Nxd4 13. Rxd4 0-0 14. g5 Ne8 15. f5 Qa5 16. Rg1 g6 17. h4 Bd8 18. h5 Ng7 19. Rxd6 Rxc3 20. Rxd7 Rxe3 21. Qxe3 Bb6 22. Qe1 Qc5 23. Rf1 exf5 24. h6 Ne6 25. Bxe6 fxe6 26. exf5 Qe3+ 27. Kb1 exf5 28. Qb4 f4 29. Rg7+ 1-0

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.20"]
[Round "3"]
[White "Dahlberg, Ivars A"]
[Black "Savereide, Diane"]
[Result "1/2-1/2"]
[ECO "D92"]
[BlackElo "2140"]
[PlyCount "40"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Nf3 c5 6. dxc5 Qa5 7. cxd5 Nxd5 8. Qxd5 Bxc3+ 9. Bd2 Be6 10. Qxb7 Bxd2+ 11. Nxd2 0-0 12. b4 Qa4 13. Qxa8 Nc6 14. Qb7 Nxb4 15. Rc1 Nc2+ 16. Rxc2 Qxc2 17. Qb1 Qc3 18. h4 Rd8 19. Qd1 Rxd2 20. Qxd2 Qa1+ 1/2-1/2

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.20"]
[Round "4"]
[White "Lucky, David N"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "D43"]
[PlyCount "41"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 c6 5. Bf4 dxc4 6. a4 Bb4 7. e3 Nd5 8. Rc1 Nxf4 9. exf4 Qf6 10. g3 0-0 11. Bxc4 b6 12. 0-0 Rd8 13. Ne4 Qh6 14. Ne5 Be7 15. Ng4 Qg6 16. Re1 Bb7 17. Ne5 Qh6 18. f5 Qh3 19. fxe6 f5 20. Ng5 Qh6 21. Ngf7 1-0

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.19"]
[Round "1"]
[White "Dahlberg, Ivars A"]
[Black "Christiansen, Larry Mark"]
[Result "0-1"]
[ECO "A32"]
[BlackElo "2485"]
[PlyCount "48"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 e6 5. g3 a6 6. Bg2 Qc7 7. b3 Nc6 8. 0-0 h5 9. Nf3 h4 10. Bf4 e5 11. Bg5 hxg3 12. hxg3 Qa5 13. Bxf6 gxf6 14. Qd5 Bc5 15. Nbd2 d6 16. Ne4 Be6 17. Qd3 f5 18. Nf6+ Ke7 19. Nd5+ Bxd5 20. Qxd5 Rag8 21. a3 Rxg3 22. b4 Qd8 23. Ng5 Rxg5 24. bxc5 Rxg2+ 0-1

[Event "USA"]
[Site "USA"]
[Date "1980.??.??"]
[Round "?"]
[White "Browne, Walter Shawn"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "D44"]
[WhiteElo "2540"]
[PlyCount "71"]
[EventDate "1980.??.??"]
[EventType "game"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 c6 5. Bg5 dxc4 6. e4 b5 7. e5 h6 8. Bh4 g5 9. Nxg5 hxg5 10. Bxg5 Nbd7 11. g3 Qb6 12. exf6 Bb7 13. Bg2 0-0-0 14. 0-0 c5 15. dxc5 Bxc5 16. Qe2 Rdg8 17. h4 Nxf6 18. Bxf6 Rxg3 19. Ne4 Rhg8 20. Bg5 Rxg2+ 21. Kxg2 f5 22. f3 fxe4 23. fxe4 Qd6 24. Kh3 Qe5 25. Rae1 Bb4 26. Bf4 Qh8 27. Rc1 e5 28. Bg3 Qg7 29. Rg1 Bc5 30. Bf2 Qd7+ 31. Kh2 Rh8 32. Rxc4 bxc4 33. Qxc4 Qc6 34. Rc1 Kd7 35. Qf7+ Kd8 36. Rxc5 1-0

[Event "American op 10th"]
[Site "Santa Monica"]
[Date "1974.11.30"]
[Round "6"]
[White "Stoutenborough, Ross"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "D34"]
[PlyCount "65"]
[EventDate "1974.11.28"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. Nf3 e6 2. g3 d5 3. Bg2 c5 4. 0-0 Nc6 5. d4 Nf6 6. c4 Be7 7. cxd5 exd5 8. Nc3 0-0 9. dxc5 d4 10. Na4 Bf5 11. Ne1 Qd7 12. Nd3 Be4 13. Bxe4 Nxe4 14. b4 h5 15. f3 Nf6 16. b5 Na5 17. Rb1 Rfe8 18. Qc2 h4 19. Bd2 hxg3 20. Bxa5 Nd5 21. e4 Ne3 22. Qe2 Bg5 23. hxg3 Nxf1 24. Qxf1 Be3+ 25. Kg2 Re6 26. c6 Qd6 27. cxb7 Rae8 28. e5 Qa3 29. Ndc5 Rxe5 30. Qc4 Rxc5 31. Qxc5 Qxa4 32. Qc8 Qxa2+ 33. Kh3 1-0

[Event "American op 10th"]
[Site "Santa Monica"]
[Date "1974.11.29"]
[Round "3"]
[White "Dahlberg, Ivars A"]
[Black "Foreman, Brian A"]
[Result "0-1"]
[ECO "E77"]
[PlyCount "102"]
[EventDate "1974.11.28"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. d4 Bg7 4. e4 0-0 5. f4 d6 6. Be2 c5 7. d5 Re8 8. Nf3 e6 9. 0-0 exd5 10. exd5 Bf5 11. Bd3 Qd7 12. Qc2 Bxd3 13. Qxd3 Na6 14. Bd2 Nc7 15. h3 a6 16. a4 b6 17. f5 Qxf5 18. Qxf5 gxf5 19. Nh4 Ne4 20. Be1 Bd4+ 21. Kh1 Bxc3 22. bxc3 b5 23. axb5 axb5 24. Rxa8 Rxa8 25. cxb5 Nxb5 26. Nxf5 Ra1 27. Kg1 Nbxc3 28. Bxc3 Rxf1+ 29. Kxf1 Nxc3 30. Nxd6 Nxd5 31. Kf2 Kf8 32. Kf3 Ke7 33. Nf5+ Ke6 34. g4 Ke5 35. Nh6 f6 36. Nf7+ Kd4 37. g5 c4 38. gxf6 c3 39. Ke2 Nxf6 40. Nd6 Ne4 41. Nf5+ Kc4 42. Ne3+ Kb3 43. h4 c2 44. Nxc2 Kxc2 45. Ke3 Nc5 46. Kf4 Nd7 47. Kg5 Nf8 48. Kh6 Kd3 49. Kg7 Ke4 50. Kxf8 h5 51. Kg7 Kf5 0-1

[Event "American op 10th"]
[Site "Santa Monica"]
[Date "1974.11.28"]
[Round "2"]
[White "Hess, Peter"]
[Black "Dahlberg, Ivars A"]
[Result "0-1"]
[ECO "C01"]
[PlyCount "82"]
[EventDate "1974.11.28"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. exd5 exd5 5. Qf3 Be6 6. a3 Be7 7. Bd3 Nf6 8. Bf4 c6 9. h3 Nbd7 10. Nge2 0-0 11. 0-0 Re8 12. g4 Nf8 13. g5 N6d7 14. Qg3 Nb6 15. Bc7 Qd7 16. Bxb6 axb6 17. h4 Bd6 18. f4 Bf5 19. Rf3 Re7 20. Raf1 Rae8 21. Qg2 Ng6 22. Ng3 Bxd3 23. Rxd3 Nxf4 24. Rxf4 Bxf4 25. Nh5 Qd6 26. Nf6+ Kh8 27. Nxe8 Rxe8 28. Ne2 Be3+ 29. Kf1 Qe6 30. Qf3 Kg8 31. Rb3 b5 32. a4 bxa4 33. Rxb7 h6 34. gxh6 Bxh6 35. Ra7 Rb8 36. Rxa4 Rxb2 37. Ra8+ Kh7 38. Qd3+ g6 39. Ra6 Rb1+ 40. Kf2 Qf6+ 41. Kg3 Rh1 0-1

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.25"]
[Round "12"]
[White "Dahlberg, Ivars A"]
[Black "Sobczyk, Eugene"]
[Result "1-0"]
[ECO "D80"]
[PlyCount "69"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bg5 Ne4 5. cxd5 Nxc3 6. bxc3 Qxd5 7. Nf3 Qa5 8. Qd2 c5 9. e3 Bg7 10. Be2 Nc6 11. 0-0 0-0 12. Rab1 Rd8 13. Rfc1 Qc7 14. a4 h6 15. Bh4 Bf5 16. Rb5 b6 17. Qa2 Be6 18. Qa3 cxd4 19. cxd4 Qd7 20. Rb2 Rac8 21. Rbc2 g5 22. Bg3 g4 23. Bb5 gxf3 24. Bxc6 Rxc6 25. Rxc6 Bd5 26. Rc7 Qg4 27. Qxe7 Rf8 28. Rxa7 fxg2 29. Qd6 Be6 30. Rac7 h5 31. d5 Bf5 32. Qf4 Qg6 33. d6 Rd8 34. e4 Bh3 35. Qh4 1-0

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.23"]
[Round "10"]
[White "Matera, Salvatore Joseph"]
[Black "Dahlberg, Ivars A"]
[Result "1/2-1/2"]
[ECO "A21"]
[PlyCount "67"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 d6 3. g3 f5 4. Bg2 Nf6 5. d3 g6 6. e3 Bg7 7. Nge2 0-0 8. Rb1 a5 9. 0-0 Kh8 10. a3 g5 11. f4 exf4 12. gxf4 Nh5 13. fxg5 Qxg5 14. Nd5 Rg8 15. Nef4 Nxf4 16. Nxf4 Nc6 17. Qh5 Qxh5 18. Nxh5 Be6 19. b3 Rae8 20. Nxg7 Rxg7 21. Bb2 Ne5 22. Kh1 Bc8 23. Rg1 h6 24. Bd5 c6 25. Bf3 Rxg1+ 26. Rxg1 Kh7 27. Be2 c5 28. d4 Ng4 29. Bxg4 fxg4 30. Re1 Bf5 31. Bc3 Be4+ 32. Kg1 b6 33. dxc5 dxc5 34. Rd1 1/2-1/2

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.22"]
[Round "9"]
[White "Dahlberg, Ivars A"]
[Black "Zemgalis, Elmars"]
[Result "1/2-1/2"]
[ECO "D35"]
[PlyCount "35"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2016"]
[Source "ChessBase"]
[SourceDate "2015.10.08"]
[SourceVersion "1"]
[SourceVersionDate "2015.10.08"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Nbd7 5. cxd5 exd5 6. Bg5 Be7 7. e3 0-0 8. Bd3 Re8 9. 0-0 Nf8 10. Qc2 Nh5 11. Bxe7 Rxe7 12. Ne5 c6 13. Na4 Nf6 14. Nc5 Ne8 15. b4 Nd6 16. a4 f6 17. Nf3 Qe8 18. Qa2 1/2-1/2

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.21"]
[Round "8"]
[White "Lombardy, William James"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "A14"]
[PlyCount "95"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 e6 3. Nf3 d5 4. Bg2 Be7 5. 0-0 0-0 6. b3 c5 7. Bb2 Nc6 8. Na3 d4 9. e3 e5 10. exd4 cxd4 11. Nc2 Bf5 12. d3 Nd7 13. Re1 Re8 14. Qe2 Nb4 15. Nxb4 Bxb4 16. Red1 Nc5 17. Nh4 Bd7 18. a3 Bc3 19. Bxc3 dxc3 20. Qc2 Bg4 21. Bf3 Bxf3 22. Nxf3 Qf6 23. Kg2 Rad8 24. b4 Nxd3 25. Rxd3 Rxd3 26. Qxd3 e4 27. Qe3 exf3+ 28. Qxf3 Qd4 29. Rc1 c2 30. Rxc2 g6 31. c5 Re6 32. Qxb7 Qd1 33. Rc4 Re1 34. Qc8+ Kg7 35. Qg4 Rg1+ 36. Kh3 Qf1+ 37. Kh4 Rh1 38. Qd4+ f6 39. Kg4 Rxh2 40. Kf3 Rh5 41. Qd7+ Kh6 42. Rh4 Rxh4 43. gxh4 Qh1+ 44. Ke2 Qxh4 45. c6 Qe4+ 46. Kd2 Qf4+ 47. Kc3 Qf3+ 48. Kc2 1-0

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.20"]
[Round "7"]
[White "Dahlberg, Ivars A"]
[Black "LeCompte, George"]
[Result "1-0"]
[ECO "D82"]
[PlyCount "51"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Bf4 Bg7 5. Qa4+ Bd7 6. Qb3 c5 7. Nxd5 Nxd5 8. cxd5 Na6 9. Rc1 Bxd4 10. Nf3 Bg7 11. Qxb7 Nb4 12. a3 Bxb2 13. axb4 Bxc1 14. Bxc1 cxb4 15. Ne5 Qc8 16. Qxd7+ Qxd7 17. Nxd7 Kxd7 18. e4 h6 19. Be2 Rhc8 20. Kd2 b3 21. Bd3 Rab8 22. Bb2 Rb4 23. Ra1 Rb6 24. Bd4 b2 25. Rb1 Rcb8 26. Bxb6 1-0

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.19"]
[Round "6"]
[White "Jackson, Leroy"]
[Black "Dahlberg, Ivars A"]
[Result "0-1"]
[ECO "B88"]
[PlyCount "68"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bc4 e6 7. Be3 a6 8. 0-0 Qc7 9. Be2 Na5 10. f4 Be7 11. e5 dxe5 12. fxe5 Qxe5 13. Bf4 Qc5 14. Na4 Qa7 15. Kh1 Bd7 16. c4 0-0 17. Be3 Bxa4 18. Qxa4 Bc5 19. Rad1 e5 20. Qxa5 exd4 21. Rxf6 gxf6 22. Bh6 Rfe8 23. Bd3 Qb6 24. Qd2 Qe6 25. Rf1 Bf8 26. Qf4 Bxh6 27. Qxh6 f5 28. Qh3 Qg6 29. Bxf5 Qg7 30. Kg1 Re3 31. Qh5 Rae8 32. b4 d3 33. Qd1 Re2 34. g3 Qh6 0-1

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.18"]
[Round "5"]
[White "Dahlberg, Ivars A"]
[Black "O'Gorman, Peter"]
[Result "1-0"]
[ECO "A44"]
[PlyCount "37"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 c5 2. d5 e5 3. e4 d6 4. f4 g6 5. Nf3 Nd7 6. Bb5 exf4 7. Bxf4 Bg7 8. Nbd2 Qe7 9. 0-0 Ngf6 10. Nc4 Nxe4 11. Re1 f5 12. Bxd6 Qf7 13. Bxc5 Kd8 14. Nd6 Nxd6 15. Bxd6 Bf6 16. Nd4 Nf8 17. Nc6+ bxc6 18. dxc6 Ne6 19. c7+ 1-0

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.17"]
[Round "3"]
[White "Dahlberg, Ivars A"]
[Black "Erkes, Robert"]
[Result "1-0"]
[ECO "A43"]
[PlyCount "63"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 g6 2. e4 Bg7 3. f4 c5 4. d5 d6 5. Nf3 e6 6. Bb5+ Bd7 7. Bxd7+ Qxd7 8. Nc3 Ne7 9. dxe6 fxe6 10. Be3 Na6 11. Qd2 Rd8 12. 0-0-0 d5 13. exd5 exd5 14. Bf2 0-0 15. Rhe1 d4 16. Bh4 Rde8 17. Ne5 Bxe5 18. fxe5 Qg4 19. Bxe7 dxc3 20. Qd5+ Rf7 21. Bd6 cxb2+ 22. Kb1 Qf5 23. e6 Qxd5 24. Rxd5 Rf2 25. a3 Rxg2 26. Kxb2 c4 27. Rd4 c3+ 28. Kxc3 Rc8+ 29. Kb3 Rgxc2 30. e7 R2c3+ 31. Kb2 Rc2+ 32. Kb1 1-0

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.16"]
[Round "4"]
[White "Thurston, Ben"]
[Black "Dahlberg, Ivars A"]
[Result "0-1"]
[ECO "A21"]
[PlyCount "48"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 d6 3. g3 f5 4. e4 Nf6 5. exf5 Bxf5 6. Bg2 Nc6 7. Nge2 Bd3 8. a3 Bxc4 9. d3 Be6 10. d4 Bf5 11. Bxc6+ bxc6 12. dxe5 dxe5 13. Qxd8+ Rxd8 14. Be3 a5 15. 0-0 Rb8 16. Na4 Bc2 17. Nec3 Nd5 18. Bc1 Bd6 19. Re1 0-0 20. Re2 Bd3 21. Re1 Rf3 22. Kg2 Rbf8 23. Bf4 exf4 24. Kxf3 fxg3+ 0-1

[Event "US Open-67"]
[Site "Seattle"]
[Date "1966.08.14"]
[Round "1"]
[White "Dahlberg, Ivars A"]
[Black "Lundin, Robert"]
[Result "1-0"]
[ECO "A52"]
[PlyCount "47"]
[EventDate "1966.08.14"]
[EventType "swiss"]
[EventRounds "13"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. Nf3 Nc6 5. Bf4 Bb4+ 6. Nbd2 Qe7 7. a3 Ngxe5 8. Nxe5 Nxe5 9. e3 Bxd2+ 10. Qxd2 f6 11. Be2 d6 12. 0-0 0-0 13. Rac1 b6 14. b4 c5 15. Rfd1 Rd8 16. a4 Bb7 17. a5 d5 18. Bxe5 fxe5 19. bxc5 bxc5 20. cxd5 Bxd5 21. Qc2 Bb7 22. Qxc5 Qg5 23. Bf1 Rac8 24. Qxa7 1-0

[Event "Pacific NW-ch"]
[Site "Portland"]
[Date "1965.12.??"]
[Round "4"]
[White "Zemgalis, Elmars"]
[Black "Dahlberg, Ivars A"]
[Result "1/2-1/2"]
[ECO "E32"]
[PlyCount "75"]
[EventDate "1965.12.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. Nc3 Bb4 5. Qb3 c5 6. a3 Bxc3+ 7. Qxc3 Ne4 8. Qc2 Bb7 9. e3 0-0 10. Bd3 f5 11. 0-0 d6 12. Nd2 Qh4 13. f4 Nxd2 14. Bxd2 Nd7 15. Bc3 Nf6 16. Rae1 Ne4 17. Bxe4 Bxe4 18. Qf2 Qh5 19. Rd1 Rf6 20. dxc5 Rg6 21. cxd6 Qh3 22. Rd2 Rd8 23. Be5 Rd7 24. Re1 Bxg2 25. Qxg2 Qh4 26. Red1 Rxg2+ 27. Rxg2 Qh5 28. Rf1 Qe8 29. Rf3 Qc8 30. Rfg3 Qxc4 31. Rxg7+ Rxg7 32. Rxg7+ Kf8 33. d7 Qc1+ 34. Kg2 Qd2+ 35. Kf3 Qd1+ 36. Kf2 Qd2+ 37. Kf3 Qd1+ 38. Kf2 1/2-1/2

[Event "Seattle Seafair"]
[Site "Seattle"]
[Date "1964.??.??"]
[Round "?"]
[White "Dahlberg, Ivars A"]
[Black "Pupols, Viktors"]
[Result "0-1"]
[ECO "C11"]
[PlyCount "68"]
[EventDate "1964.??.??"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "USA"]
[SourceTitle "EXT 2004"]
[Source "ChessBase"]
[SourceDate "2003.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2003.11.25"]
[SourceQuality "1"]

1. d4 e6 2. e4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Bxc5 7. Nf3 Nc6 8. Bd3 f6 9. Qe2 0-0 10. h4 Qe8 11. Nb5 fxe5 12. Nc7 Qh5 13. Nxe5 Qxe2+ 14. Bxe2 Ndxe5 15. Nxa8 Ng6 16. Nc7 a6 17. g3 Bd7 18. c3 Bb6 19. Nxa6 bxa6 20. Bxa6 e5 21. Bd3 exf4 22. Bxf4 Nce5 23. Bxg6 Nxg6 24. Bd6 Rf6 25. Bb8 Rf2 26. h5 Ne7 27. Bf4 Bg4 28. b4 Bf3 29. a4 Bxh1 30. a5 Ba7 31. b5 Bg2 32. 0-0-0 Nc8 33. Rd2 Rxd2 34. Kxd2 Bf1 0-1

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.21"]
[Round "7"]
[White "Dahlberg, Ivars A"]
[Black "Groenig, David"]
[Result "1-0"]
[ECO "A51"]
[PlyCount "51"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e5 3. dxe5 Ne4 4. a3 d6 5. Qc2 Bf5 6. Nc3 Nxf2 7. Qxf5 Nxh1 8. e6 fxe6 9. Qxe6+ Be7 10. Nf3 Qd7 11. Qxd7+ Kxd7 12. g3 c6 13. Bh3+ Kc7 14. Bg2 Nxg3 15. hxg3 Nd7 16. Bf4 h6 17. 0-0-0 g5 18. Bd2 Rae8 19. Nd4 Bf6 20. Nf5 Re5 21. Rf1 Ree8 22. Ne4 Be5 23. Rh1 Re6 24. Bf3 a6 25. Kc2 Nf6 26. Nxg5 1-0

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.18"]
[Round "5"]
[White "Jenkins, Thomas"]
[Black "Dahlberg, Ivars A"]
[Result "1-0"]
[ECO "B59"]
[PlyCount "97"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 e5 7. Nb3 Be7 8. 0-0 0-0 9. Be3 a5 10. Bb5 Be6 11. f3 Qc7 12. Nd5 Bxd5 13. exd5 Nb4 14. c4 a4 15. Nc1 Qa5 16. Qe2 Rfc8 17. Rd1 Na6 18. Kh1 h6 19. Qd2 Qxd2 20. Rxd2 Nc7 21. Ne2 Nxb5 22. cxb5 Bd8 23. Ng3 Ba5 24. Rd3 Rc2 25. Nf5 Ne8 26. f4 f6 27. fxe5 fxe5 28. Rf1 Rc7 29. g4 Kh7 30. g5 h5 31. Nh4 g6 32. Bg1 Ng7 33. Rf6 Be1 34. Nxg6 Ne8 35. Nf8+ Kg8 36. Rf1 Bb4 37. Rdf3 Ng7 38. g6 e4 39. Rf6 Ne8 40. R6f4 Bd2 41. Rxe4 Nf6 42. Rxf6 Rxf8 43. Rxd6 Rc1 44. Kg2 Rc2 45. Re2 Rxb2 46. Bd4 Bb4 47. Bxb2 Bxd6 48. Re6 Bc5 49. Bf6 1-0

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.17"]
[Round "4"]
[White "Dahlberg, Ivars A"]
[Black "Bisguier, Arthur Bernard"]
[Result "0-1"]
[ECO "E46"]
[PlyCount "82"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 0-0 5. Nge2 d5 6. a3 Bd6 7. c5 Be7 8. Ng3 a5 9. Rb1 Nbd7 10. f4 c6 11. b4 axb4 12. axb4 b6 13. Bd3 Ba6 14. 0-0 Bxd3 15. Qxd3 Qc7 16. Bb2 Qb7 17. Rfc1 Rfb8 18. Nd1 Ne8 19. Nf1 f5 20. Nd2 Nef6 21. Qc2 b5 22. Ra1 Ne4 23. Nxe4 dxe4 24. Bc3 Nf6 25. Qb3 Nd5 26. Be1 g5 27. Nc3 gxf4 28. Nxd5 exd5 29. exf4 Bf6 30. Bf2 Qg7 31. Qd1 Ra4 32. Rxa4 bxa4 33. Qxa4 Bxd4 34. Bxd4 Qxd4+ 35. Kh1 Qf6 36. h3 d4 37. Ra1 d3 38. b5 cxb5 39. Qa7 Rd8 40. Ra6 Qd4 41. Qe7 d2 0-1

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.16"]
[Round "3"]
[White "Dahlberg, Ivars A"]
[Black "Blackstone, John"]
[Result "1-0"]
[ECO "E76"]
[PlyCount "47"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 g6 4. e4 Bg7 5. f4 e5 6. dxe5 dxe5 7. Qxd8+ Kxd8 8. fxe5 Nfd7 9. Bg5+ Ke8 10. Nd5 Na6 11. Nf6+ Kf8 12. 0-0-0 h6 13. Bh4 Nac5 14. Nf3 g5 15. Nxd7+ Nxd7 16. Bg3 g4 17. e6 Nf6 18. e5 Ne4 19. Rd8+ Ke7 20. Bh4+ Kxe6 21. Nd4+ Kxe5 22. Rd5+ Kf4 23. Nc2 g3 24. Be2 1-0

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.15"]
[Round "2"]
[White "Pawlow, Jerzy"]
[Black "Dahlberg, Ivars A"]
[Result "0-1"]
[ECO "E24"]
[PlyCount "58"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. g3 Nc6 7. e3 0-0 8. Nf3 d6 9. Bg2 e5 10. h3 Qe7 11. d5 Na5 12. Nd2 b6 13. g4 Ba6 14. g5 Nd7 15. Qg4 f5 16. Qh5 e4 17. Bf1 Ne5 18. Be2 Bxc4 19. Nxc4 Naxc4 20. Bxc4 Nxc4 21. Qe2 Ne5 22. h4 f4 23. a4 Nd3+ 24. Kf1 Qe5 25. Bd2 Qxd5 26. Kg1 a6 27. Rh2 Ne5 28. Kh1 Nf3 29. Rd1 Qd3 0-1

[Event "North West Latvian Invitation-ch"]
[Site "Seattle"]
[Date "1961.07.02"]
[Round "2"]
[White "Zemgalis, Elmars"]
[Black "Dahlberg, Ivars A"]
[Result "1/2-1/2"]
[ECO "A47"]
[PlyCount "92"]
[EventDate "1961.12.01"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2007"]
[Source "ChessBase"]
[SourceDate "2006.11.23"]
[SourceVersion "1"]
[SourceVersionDate "2006.11.23"]
[SourceQuality "1"]

1. Nf3 Nf6 2. d4 e6 3. Bf4 c5 4. e3 Nc6 5. Nbd2 Be7 6. c3 cxd4 7. exd4 0-0 8. Bd3 b6 9. h3 Bb7 10. 0-0 Rc8 11. Bh2 h6 12. Qe2 d6 13. Rad1 Re8 14. Rfe1 Bf8 15. Nf1 Rc7 16. Ne3 Qa8 17. Ba6 Rd7 18. Bxb7 Qxb7 19. Qf1 d5 20. Nd2 b5 21. a3 a5 22. Bg3 Rc8 23. f4 b4 24. axb4 axb4 25. Rb1 Bd6 26. Qf3 Qc7 27. Rf1 bxc3 28. bxc3 Ne7 29. c4 dxc4 30. Ndxc4 Nf5 31. Nb6 Nxg3 32. Qxg3 Ne4 33. Qe1 Bxf4 34. Rxf4 Qxf4 35. Nxd7 Nc3 36. Rb8 Rxb8 37. Nxb8 Qxd4 38. Kh1 Ne4 39. Qc1 Ng3+ 40. Kh2 Qf4 41. Qc8+ Kh7 42. Nd7 h5 43. Nf8+ Kh6 44. Nxe6 fxe6 45. Qxe6+ g6 46. Kg1 Ne2+ 1/2-1/2

