Dragon versus Nakamura

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AdminX
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Re: Dragon versus Nakamura

Post by AdminX » Thu Nov 19, 2020 11:27 pm

"Good decisions come from experience, and experience comes from bad decisions."
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Ted Summers

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Graham Banks
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Re: Dragon versus Nakamura

Post by Graham Banks » Thu Nov 19, 2020 11:54 pm

Nakamura psyched himself out.
gbanksnz at gmail.com

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Re: Dragon versus Nakamura

Post by AdminX » Thu Nov 19, 2020 11:55 pm

"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers

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AdminX
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Re: Dragon versus Nakamura

Post by AdminX » Thu Nov 19, 2020 11:57 pm

Graham Banks wrote:
Thu Nov 19, 2020 11:54 pm
Nakamura psyched himself out.
I don't think he realized he was playing the MCTS version.
"Good decisions come from experience, and experience comes from bad decisions."
__________________________________________________________________
Ted Summers

dkappe
Posts: 573
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Full name: Dietrich Kappe

Re: Dragon versus Nakamura

Post by dkappe » Thu Nov 19, 2020 11:59 pm

AdminX wrote:
Thu Nov 19, 2020 11:57 pm
Graham Banks wrote:
Thu Nov 19, 2020 11:54 pm
Nakamura psyched himself out.
I don't think he realized he was playing the MCTS version.
It’s 100 elo weaker, but really is excellent for human prep.

Vinvin
Posts: 4784
Joined: Thu Mar 09, 2006 8:40 am
Full name: Vincent Lejeune

Re: Dragon versus Nakamura

Post by Vinvin » Fri Nov 20, 2020 12:25 am

Final score : Dragon wins 6.5-1.5 (===+++++)

The 8 games on Lichess with a quick automatic analyze : https://lichess.org/study/x960lWCJ

8 games in PGN :

Code: Select all

[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.18"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1/2-1/2"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "Game drawn by insufficient material"]
[UTCDate "2020.11.20"]
[UTCTime "00:05:21"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/P1PPP1PP/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. c4?? { Blunder. e3 was best. } (1. e3 Nf6 2. c4 e6 3. Nf3 c5 4. Bb2 Be7 5. Nc3 d5 6. Bd3 Nc6 7. O-O O-O) 1... Nf6 2. Nf3 g6 3. g3 b6 4. Bg2 Bb7 5. O-O Bg7 6. Nc3 O-O 7. Bb2 c5 8. a4 Nc6 9. Nb5 a6 10. Na3 Nb4 11. Nc2 a5 12. Na3 d5 13. cxd5 Bxd5 14. Rc1 Rc8 15. Nc4 Ne8 16. Bxg7 Kxg7 17. Ne3 Bxf3 18. Bxf3 e5 19. Qb3 f6 20. Bg2 Nd6 21. h4 h5 22. d3 f5 23. Qb2 Qf6 24. Nd5 Nxd5 25. Bxd5 e4 26. Rb1 Rb8 27. Kg2 Rfe8 28. Bc6 Re7 29. Qxf6+ Kxf6 30. Bd5 Ke5 31. Ba2 Rc7 32. Rfd1 c4?! { Inaccuracy. b5 was best. } (32... b5) 33. dxc4 Rc5 34. Kf2 Rb7 35. Rd2 Nf7?? { Blunder. Nxc4 was best. } (35... Nxc4 36. Rd8) 36. Rdb2 g5 37. hxg5 Nxg5 38. Rxb6 Rxb6 39. Rxb6 f4 40. gxf4+ Kxf4 41. e3+ Kg4 42. Bb3 h4 43. Bd1+ Nf3 44. Rf6 Kg5 45. Rf4 Nd2 46. Rg4+ Kf6 47. Rxh4 Rxc4 48. Rh6+ Ke7 49. Kg3 Rb4 50. Kf4 Nc4 51. Ra6 Nb2 52. Be2 Rxa4 53. Kf5 Rb4 54. Rxa5 Kd6 55. Ra6+ Ke7 56. Rc6 Nd3 57. Rc2 Ra4 58. Kg4 Ke6 59. Kg3 Ra3 60. Bh5 Nb4 61. Rc8 Rxe3+ 62. Kf2 Ra3 63. Ke2?! { Inaccuracy. Bg6 was best. } (63. Bg6 e3+ 64. Kf3 Nd5 65. Bh7 Kd7 66. Bf5+ Kd6 67. Bc2 Ke5 68. Re8+ Kd4 69. Rd8 Kc5) 63... Nd5 64. Re8+ Kf5 65. Kf2 Nf4 66. Bf7 Rf3+ 67. Ke1 e3 68. Bb3 e2 69. Bc2+ Kf6 70. Kd2 Rf1 71. Rxe2 Nxe2 72. Kxe2 Ra1 73. Kd2 Ra3 74. Bb1 Ke5 75. Bc2 Kd4 76. Bh7 Ra2+ 77. Ke1 Ke3 78. Kd1 Rd2+ 79. Kc1 Rd7 80. Bf5 Rc7+ 81. Kb1 Rc5 82. Be6 Rc1+ 83. Kxc1 { 1/2-1/2 The game is a draw. } 1/2-1/2


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.18"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1/2-1/2"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "Game drawn by agreement"]
[UTCDate "2020.11.20"]
[UTCTime "00:05:55"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PP1PP1PP/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. e4?? { Blunder. d4 was best. } (1. d4 Nf6 2. Nc3 d5 3. Bf4 e6 4. e3 Bd6 5. Nf3 O-O) 1... e6 2. Nf3 c5 3. Nc3 Nc6 4. a3 a6 5. d4 cxd4 6. Nxd4 Nf6 7. Be3 b5 8. Nxc6 dxc6 9. Qxd8+ Kxd8 10. e5 Nd7 11. Be2 Nxe5 12. O-O f6 13. Ne4 Nd7 14. a4 Bb7 15. Rfd1 Kc7 16. axb5 axb5 17. Rac1 Be7 18. Nc3 Ba6 19. Nxb5+ Bxb5 20. Bxb5 Ne5?! { Inaccuracy. Nb8 was best. } (20... Nb8) 21. Bd4 Rad8?! { Inaccuracy. Rhc8 was best. } (21... Rhc8) 22. Bxe5+ fxe5 23. Rxc6+ Kb8 24. Rdc1 Rc8 25. Rb6+ Ka7 26. Ra6+ Kb7 27. Rxc8 Rxc8 28. Rxe6 Rc1+ 29. Kf2 Rc2+ 30. Be2 Bc5+ 31. Ke1 Bb4+ 32. Kf1 Rxb2 33. Rxe5 Kc6 34. Rh5 h6 35. Bf3+ Kb6 36. Rd5 Bc3 37. Be2 Bf6 38. Kf2 Kc6 39. Rd1 Kc5 40. Kf3 Rb4 41. h3 Rd4 42. Rc1+ Kd6 43. Rb1 Ra4 44. Rb3 Kc5 45. Bd3 Rb4 46. Ra3 Rb2 47. Be4 Kd6 48. Kf4 Rb5 49. Ra6+ Ke7 50. Bf3 h5 51. Be2 Rc5 52. Ra7+ Kd6 53. Kf3 h4 54. Kf4 Be5+ 55. Ke4 Bf6 56. Ra6+ Rc6 57. Ra2 Rc5 58. Rd2+ Ke7 59. Bg4 Rc4+ 60. Kd5 Rb4 61. Re2+ Kf8 62. Ra2 Rb5+ 63. Ke4 Re5+ 64. Kf4 Rc5 65. Ra7 Re5 66. Rd7 Re7 67. Rd8+ Kf7 68. Rc8 g6 69. Rc6 Kg7 70. Bf3 Ra7 71. Rb6 Re7 72. Rb5 Ra7 73. Rb4 Rf7 { 1/2-1/2 The game is a draw. } 1/2-1/2


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.18"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1/2-1/2"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "Game drawn by agreement"]
[UTCDate "2020.11.20"]
[UTCTime "00:06:25"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/P1PPPP1P/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. c4?? { Blunder. Bg2 was best. } (1. Bg2) 1... Nf6 2. Bg2 g6 3. e3 Bg7 4. Bb2 O-O 5. Ne2 Nc6 6. Ng3 b6 7. d3 Bb7 8. O-O e6 9. Nd2 Ne8 10. Bxg7 Nxg7 11. f4 Na5 12. Bxb7 Nxb7 13. Qe2 c6 14. Nf3 d5 15. Kh1 Rc8 16. e4 Nd6 17. a4 a6 18. Rg1 Qe7 19. Rae1 Rfe8 20. Ne5 dxc4 21. dxc4 c5 22. Rg2 f5?! { Inaccuracy. Qh4 was best. } (22... Qh4 23. Rf2 Red8 24. Rb1 f6 25. Nf3 Qxf4 26. e5 fxe5 27. Nxe5 Qd4 28. Rxb6 Rf8 29. Rxf8+) 23. Qb2?! { Inaccuracy. Nh5 was best. } (23. Nh5 gxh5 24. Reg1 Rc7 25. Rxg7+ Qxg7 26. exf5 Nxf5 27. Qb2 Qxg1+ 28. Kxg1 Rb7 29. Qe2 h4) 23... Qc7 24. Reg1?! { Inaccuracy. Rb1 was best. } (24. Rb1) 24... Re7?! { Inaccuracy. Nxe4 was best. } (24... Nxe4 25. Nxe4 fxe4 26. Qe2 Qb7 27. Re1 Red8 28. Qxe4 Qxe4 29. Rxe4 Rd1+ 30. Rg1 Rcd8 31. Rxd1) 25. Rb1 Qb8?! { Inaccuracy. Rb8 was best. } (25... Rb8 26. Rd2) 26. Kg1?! { Inaccuracy. a5 was best. } (26. a5 fxe4 27. axb6 Qb7 28. Kg1 e3 29. Qe2 Ngf5 30. Qd3 Rf8 31. Rgb2 Nxg3 32. hxg3 Nf5) 26... Rb7 27. Rd1 b5 28. cxb5 axb5 29. exf5 Nc4?! { Inaccuracy. exf5 was best. } (29... exf5 30. axb5 Rxb5 31. Qd2 Nf7 32. Nxf7 Kxf7 33. Qd7+ Kf8 34. Nxf5 Rb7 35. Qd6+ Qxd6 36. Nxd6) 30. Nxc4 bxc4 31. Qc2 exf5 32. Qxc4+ Kh8 33. a5?! { Inaccuracy. Rgd2 was best. } (33. Rgd2 Rb4) 33... Rb1?! { Inaccuracy. Qa7 was best. } (33... Qa7 34. a6 Rb4 35. Qc3 c4+ 36. Kh1 Rbb8 37. Qf6 c3 38. Rc2 Kg8 39. Ne2 Qa8+ 40. Kg1) 34. Rd2 Qb4 35. Qxb4 Rxd1+ 36. Rxd1 cxb4 37. Rd6 Ra8 38. Rb6 Kg8 39. h4 Rxa5 40. Rxb4 Ne6 41. h5 Kg7 42. hxg6 hxg6 43. Kf2 Ra2+ 44. Ne2 Nc5 45. Kf3 Ra3+ 46. Kg2 Ne4 47. Nd4 Kh6 48. Nf3 Ra2+ 49. Kh3 Ra3 50. Kg2 Nf6 51. Rd4 Ra5 52. Kh3 Ra3 53. Kg2 Ra2+ 54. Rd2 Ra4 55. Rd4 Rxd4 56. Nxd4 Nd5 57. Ne6 Nxf4+ 58. Nxf4 g5 59. Nd5 g4 60. Ne7 Kh7 61. Kg1 f4 62. Kf1 f3 { 1/2-1/2 The game is a draw. } 1/2-1/2


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.19"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1-0"]
[UTCDate "2020.11.20"]
[UTCTime "00:03:59"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PP1PPP1P/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. d4 d5 2. Nc3 Nf6 3. Bf4 c6 4. e3 Bf5 5. Nge2 h6 6. Ng3 Bh7 7. Bd3 Bxd3 8. Qxd3 Nbd7 9. h4 e6 10. f3 Bb4 11. O-O-O Qa5 12. Nge2 g6 13. Kb1 Nh5 14. Bh2 Be7 15. Rhg1 Rg8 16. e4 Ndf6? { Mistake. Nb6 was best. } (16... Nb6 17. Qe3 O-O-O 18. Qxh6 Bxh4 19. Ka1 Nc4 20. b3 Nd6 21. Bxd6 Rxd6 22. Qh7 Rg7 23. Qh6) 17. Qe3 Rh8 18. Nc1 a6?! { Inaccuracy. Nd7 was best. } (18... Nd7) 19. Nb3 Qd8 20. Nc5 b6 21. Nd3 Nd7? { Mistake. Rc8 was best. } (21... Rc8 22. Rc1) 22. f4 dxe4 23. Qxe4 Rc8 24. Ne5 Nhf6 25. Qc2 Nxe5 26. dxe5 Nd5 27. h5 g5 28. Rd3 Rc7?! { Inaccuracy. Qd7 was best. } (28... Qd7 29. Rc1) 29. Rc1 Rd7?? { Blunder. Nxc3+ was best. } (29... Nxc3+ 30. Qxc3) 30. Nxd5 Rxd5 31. Qxc6+ Qd7 32. Rxd5 Qxc6 33. Rxc6 exd5 34. f5 Bd8 35. Kc2 Kd7 36. Rd6+ Kc8 37. Kc3 Bc7?? { Blunder. g4 was best. } (37... g4 38. Bg3) 38. Rf6 Rh7 39. Kd4 Bd8 40. Rc6+ Kb7 41. Kxd5 Bc7 42. Bg3 Rh8? { Mistake. Bd8 was best. } (42... Bd8 43. Rd6) 43. Rf6 Rh7 44. e6 fxe6+ { 1-0 Black resigns. } 1-0


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.18"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1-0"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "PlayKomodo won by resignation"]
[UTCDate "2020.11.20"]
[UTCTime "00:07:04"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PP1PPP1P/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. d4 e6 2. Nc3 d5 3. Nf3 Nf6 4. Rg1 g6 5. Bg5 Be7 6. Qd2 Nbd7 7. O-O-O a6 8. h4?! { Inaccuracy. Ne5 was best. } (8. Ne5 h6) 8... b5 9. Kb1 Bb7 10. e3 h6 11. Bf4 c5 12. dxc5 Bxc5 13. Bd3 Qe7 14. Ne5 Nxe5 15. Bxe5 Bd6 16. Bxd6 Qxd6 17. Ne2?! { Inaccuracy. Ne4 was best. } (17. Ne4) 17... Rc8 18. f4 Ke7?! { Inaccuracy. h5 was best. } (18... h5) 19. Nd4 h5 20. f5 gxf5?! { Inaccuracy. e5 was best. } (20... e5 21. Nb3) 21. Bxf5 Rhg8 22. Rgf1 Rg7?! { Inaccuracy. Qc5 was best. } (22... Qc5 23. Bd3) 23. Ka1?! { Inaccuracy. e4 was best. } (23. e4 Qe5) 23... Rcg8? { Mistake. Qe5 was best. } (23... Qe5) 24. e4 Rg2 25. e5 Qxe5 26. Qc3 Qd6 27. Bc2 R8g3 28. Nc6+ Bxc6 29. Qxf6+ Kd7 30. Qxf7+ Qe7 31. Qxh5 Rg7?! { Inaccuracy. Kc8 was best. } (31... Kc8 32. Qe5 Kb7 33. Rde1 Rg7 34. Bf5 Qxh4 35. Bxe6 Qg3 36. Qd4 Rc7 37. Bxd5 Qd6 38. Bxc6+) 32. Rc1 Kc7 33. Bb1 Kb7 34. Qe5 Qxh4?? { Blunder. b4 was best. } (34... b4 35. Rfe1) 35. Qxe6 Rc7?! { Inaccuracy. Qd4 was best. } (35... Qd4 36. Qxc6+) 36. Rf7 Rxf7?? { Checkmate is now unavoidable. Qc4 was best. } { 1-0 White wins. } (36... Qc4 37. Rxc4) 1-0


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.19"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1-0"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "PlayKomodo won by resignation"]
[UTCDate "2020.11.19"]
[UTCTime "23:32:38"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/P1PPPP1P/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. c4?? { Blunder. Bg2 was best. } (1. Bg2 g6) 1... g6 2. Bb2 Nf6 3. e3 Bg7 4. Bg2 O-O 5. Ne2 Nc6 6. d4 b6?! { Inaccuracy. d6 was best. } (6... d6) 7. Nd2 Bb7 8. h4 h5 9. d5 Na5 10. Bf3 e6 11. Rg1 Re8? { Mistake. Qe7 was best. } (11... Qe7) 12. Nf4 e5 13. Nxg6 fxg6 14. Rxg6 Qe7?! { Inaccuracy. d6 was best. } (14... d6) 15. Qc2 Rf8 16. Rg5 d6 17. O-O-O Bc8? { Mistake. c6 was best. } (17... c6 18. Bxh5) 18. Rdg1 Bg4?! { Inaccuracy. Ng4 was best. } (18... Ng4 19. Rxh5 Rxf3 20. Nxf3 Qf7 21. Qh7+ Kf8 22. Rg5 Bf6 23. Qxf7+ Kxf7 24. R5xg4 Bxg4 25. Rxg4) 19. Bxg4 hxg4 20. h5 Kh8 21. Rg6 Rg8 22. Qf5 Nh7?! { Inaccuracy. Qd7 was best. } (22... Qd7 23. Rxf6 Qxf5 24. Rxf5 Rgf8 25. Rg5 Rxf2 26. Rg6 Rf6 27. R1xg4 Rxg6 28. Rxg6 Rf8 29. Re6) 23. Qxg4 Qf7 24. f4 Raf8 25. fxe5 Bxe5?? { Blunder. dxe5 was best. } (25... dxe5) 26. Bxe5+ dxe5 27. Nf3 Nxc4?? { Blunder. Nf6 was best. } (27... Nf6) 28. Qxc4 Qxf3 29. Rxg8+ Rxg8 30. Rxg8+ Kxg8 31. d6+ Kg7 32. h6+ Kxh6 33. dxc7 Qxe3+ 34. Kb1 Qe1+ 35. Qc1+ { 1-0 White wins. } 1-0


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.19"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1-0"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "PlayKomodo won by resignation"]
[UTCDate "2020.11.19"]
[UTCTime "23:32:38"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/PP1PP1PP/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. e4?? { Blunder. d4 was best. } (1. d4 Nf6 2. Nc3 d5 3. Bf4 e6 4. e3 Bd6 5. Nf3 O-O) 1... e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d4 Nxd4 5. Bxf7+ Kxf7 6. Nxe5+ Kf8?? { Blunder. Ke7 was best. } (6... Ke7 7. Nc3 Nf6 8. Be3 Ne6 9. Bxc5+ Nxc5 10. Nd5+ Kf8 11. O-O d6 12. Ng4 Bxg4 13. Qxg4) 7. O-O+ Nf6 8. Nd3 Ne2+? { Mistake. d6 was best. } (8... d6 9. Nxc5) 9. Kh1 Nxc1 10. Nxc5 Qe7 11. Qxc1 d6 12. Nd3 Kg8 13. Nc3?! { Inaccuracy. Nf4 was best. } (13. Nf4 c6 14. Qc4+ Qf7 15. Qd4 Be6 16. Nc3 Qd7 17. Rad1 Re8 18. Qxd6 Qxd6 19. Rxd6 Bf7) 13... Be6 14. e5 dxe5 15. Nxe5 Qc5?! { Inaccuracy. Bxa2 was best. } (15... Bxa2 16. Re1) 16. Qe1 Rf8 17. Qg3 Nh5 18. Rxf8+ Qxf8 19. Qe3 Qf4? { Mistake. Nf6 was best. } (19... Nf6) 20. Qc5?! { Inaccuracy. Rd1 was best. } { 1-0 White wins. } (20. Rd1) 1-0


[Event "Live Chess - Odds Chess"]
[Site "Chess.com"]
[Date "2020.11.19"]
[White "PlayKomodo"]
[Black "Hikaru"]
[Result "1-0"]
[WhiteElo "3400"]
[BlackElo "2595"]
[TimeControl "900+10"]
[Termination "PlayKomodo won by resignation"]
[UTCDate "2020.11.19"]
[UTCTime "23:55:59"]
[Variant "From Position"]
[ECO "?"]
[Opening "?"]
[Annotator "https://lichess.org/@/Vinvin"]
[FEN "rnbqkbnr/pppppppp/8/8/8/8/P1PPP1PP/RNBQKBNR w KQkq - 0 1"]
[SetUp "1"]

1. c4?? { Blunder. e3 was best. } (1. e3 Nf6) 1... Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 Nc6 5. Rb1 O-O 6. d3 b6 7. e4 Bb7 8. Nge2 d6 9. O-O Nd7 10. Be3 e6 11. h4 h5 12. d4 Na5 13. Bg5 Qc8 14. Bh3?! { Inaccuracy. Qa4 was best. } (14. Qa4 c5) 14... Nxc4 15. Qa4 Na5 16. Qc2 Ba6 17. Rbd1 Qe8 18. g4 hxg4 19. Bxg4 c5 20. d5 Ne5 21. Bh3 Bc8 22. Ng3 f6? { Mistake. b5 was best. } (22... b5) 23. Bf4 Nac4 24. Qb3 Na5 25. Qc2 Nac4 26. h5 g5 27. Bc1 g4 28. Bg2 Kh7 29. dxe6 Bxe6 30. Nd5 Rf7 31. h6 Bh8 32. Nf5 b5 33. Nf4?! { Inaccuracy. Kf2 was best. } (33. Kf2) 33... Rd8 34. Rd5?! { Inaccuracy. Nxe6 was best. } (34. Nxe6 Qxe6) 34... Qg8?? { Blunder. Bc8 was best. } (34... Bc8 35. Kf2) 35. Nxe6 Nf3+? { Mistake. Re8 was best. } (35... Re8 36. Neg7) 36. Rxf3 gxf3 37. Nxd8 Rd7?! { Inaccuracy. Rf8 was best. } (37... Rf8) 38. e5 Qxg2+ 39. Qxg2 fxg2 { 1-0 White wins. } 1-0

mjlef
Posts: 1466
Joined: Thu Mar 30, 2006 12:08 pm
Contact:

Re: Dragon versus Nakamura

Post by mjlef » Fri Nov 20, 2020 1:53 am

AdminX wrote:
Thu Nov 19, 2020 11:57 pm
Graham Banks wrote:
Thu Nov 19, 2020 11:54 pm
Nakamura psyched himself out.
I don't think he realized he was playing the MCTS version.
I mentioned we used MCTS mode in the chess.com chat along the side of the game board. He speculated there was a more aggressive setting. The only change was MCTS mode. In both regular and MCTS mode we used a low Time Usage to make Dragon move faster. We even had the same Contempt. We have speculated in the past MCTS mode (although much weaker against engines) might be better against some opponents, since it should prefer to leave them with positions with just a few good moves over positions with many good moves. Regular alpha-beta does not care since if one move is a refutation, the rest are never searched at that point in the tree. We cannot prove this though since it would take a lot of games to do so.

carldaman
Posts: 2027
Joined: Sat Jun 02, 2012 12:13 am

Re: Dragon versus Nakamura

Post by carldaman » Fri Nov 20, 2020 3:16 am

The ability to pose problems for the human opponent even when down material is a great feature of Komodo/Dragon, no doubt a consequence of its MCTS and smart contempt. I wish more engines would go in this direction. Great job, Komodo team! :)

Milos
Posts: 3971
Joined: Wed Nov 25, 2009 12:47 am

Re: Dragon versus Nakamura

Post by Milos » Fri Nov 20, 2020 5:44 am

mjlef wrote:
Fri Nov 20, 2020 1:53 am
AdminX wrote:
Thu Nov 19, 2020 11:57 pm
Graham Banks wrote:
Thu Nov 19, 2020 11:54 pm
Nakamura psyched himself out.
I don't think he realized he was playing the MCTS version.
I mentioned we used MCTS mode in the chess.com chat along the side of the game board. He speculated there was a more aggressive setting. The only change was MCTS mode. In both regular and MCTS mode we used a low Time Usage to make Dragon move faster. We even had the same Contempt. We have speculated in the past MCTS mode (although much weaker against engines) might be better against some opponents, since it should prefer to leave them with positions with just a few good moves over positions with many good moves. Regular alpha-beta does not care since if one move is a refutation, the rest are never searched at that point in the tree. We cannot prove this though since it would take a lot of games to do so.
It shouldn't actually be very complicated to build a search function that in each position selects objectively sub-optimal move that, however, leads to positions where all but one or very few moves for opponent are bad. That kind of engine would easily win against best human even with a rook handicap.

jp
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Re: Dragon versus Nakamura

Post by jp » Fri Nov 20, 2020 7:44 am

Vinvin wrote:
Fri Nov 20, 2020 12:25 am
Final score : Dragon wins 6.5-1.5 (===+++++)
An excellent result for Dragon.

Milos wrote:
Fri Nov 20, 2020 5:44 am
It shouldn't actually be very complicated to build a search function that in each position selects objectively sub-optimal move that, however, leads to positions where all but one or very few moves for opponent are bad. That kind of engine would easily win against best human even with a rook handicap.
That would be a very interesting and useful function to have for chess analysis (not just so an engine can beat up a human in handicap matches).

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