Impossible Tactical Sequence! – Stockfish 15 vs Dragon – Computer Bullet Chess Championship Finals



A new major release of Stockfish is now available at

Stockfish 15 continues to push the boundaries of chess, providing unrivalled analysis and playing strength. In our testing, Stockfish 15 is ahead of Stockfish 14 by 36 Elo points and wins nine times more game pairs than it loses.

Improvements to the engine have made it possible for Stockfish to end up victorious in tournaments at all sorts of time controls ranging from bullet to classical and even at Fischer random chess. At CCC, Stockfish won all of the latest tournaments: CCC 16 Bullet, Blitz and Rapid, CCC 960 championship, and the CCC 17 Rapid. At TCEC, Stockfish won the Season 21, Cup 9, FRC 4 and in the current Season 22 superfinal, at the time of writing, has won 16 game pairs and not yet lost a single one.

This progress is the result of a dedicated team of developers that comes up with new ideas and improvements. For Stockfish 15, we tested nearly 13000 different changes and retained the best 200. These include the fourth generation of our NNUE network architecture, as well as various search improvements. To perform these tests, contributors provide CPU time for testing, and in the last year, they have collectively played roughly a billion chess games. In the last few years, our distributed testing framework, Fishtest, has been operated superbly and has been developed and improved extensively. This work by Pasquale Pigazzini, Tom Vijlbrief, Michel Van den Bergh, and various other developers is an essential part of the success of the Stockfish project.

Indeed, the Stockfish project builds on a thriving community of enthusiasts to offer a free and open-source chess engine that is robust, widely available, and very strong. We invite our chess fans to join the Fishtest testing framework and programmers to contribute to the project.

[Event “CCC 17 Bullet: Finals (2|1)”]
[Site “?”]
[Date “2022.05.18”]
[Round “1”]
[White “Stockfish”]
[Black “Dragon”]
[Result “1-0”]
[WhiteElo “?”]
[BlackElo “?”]
[Variant “Standard”]
[TimeControl “120+1”]
[ECO “C48”]
[Opening “Four Knights Game: Spanish Variation”]
[Termination “Unknown”]
[Annotator “”]

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 { C48 Four Knights Game: Spanish Variation } Bd6 5. d3 O-O 6. a3 Re8 7. h3 Bf8 8. Bc4 h6 9. g4 b5 10. Ba2 b4 11. axb4 Nxb4 12. Bb3 d5 13. g5 hxg5 14. Nxg5 Be6 15. Nxe6 Rxe6 16. Bg5 Qd7 17. Rg1 a5 18. Rg3 c6 19. Qf3 Be7 20. h4 Qb7 21. Na4 g6 22. O-O-O Kg7 23. h5 Nxh5 24. Bxe7 Nxg3 25. Bxb4 axb4 26. Nc5 Nf1 27. Rxf1 Rf6 28. Qxf6+ Kxf6 29. Nxb7 Ra1+ 30. Kd2 Rxf1 31. Ke2 Ra1 32. exd5 cxd5 33. Bxd5 Ke7 34. Bc4 f5 35. d4 exd4 36. Nc5 Kd6 37. Nd3 g5 38. Kf3 Ra8 39. Kg2 Rb8 40. b3 Rb6 41. Ne1 Ke7 42. Kg3 Kf6 43. Nd3 Rb7 44. Kf3 Ke7 45. Kg2 Kf6 46. Kg3 Ke7 47. Ne5 Rc7 48. Nf3 Kf6 49. Nxd4 Ke5 50. Nf3+ Kf6 51. Ne1 f4+ 52. Kg2 Rc6 53. Nd3 Rb6 54. f3 Ke7 55. Nc5 Rc6 56. Na6 Rb6 57. Bd3 Ke6 58. Kh3 Kf6 59. Nc7 Rb7 60. Nd5+ Ke6 61. Kg4 Rb8 62. Be4 Ke5 63. Kxg5 Rg8+ 64. Kh6 Rb8 65. Kg6 Kd4 66. Kg5 Rb7 67. c3+ bxc3 68. Nxc3 Rg7+ 69. Kf6 Rg8 70. Nd5 Re8 71. Ne7 Rf8+ 72. Ke6 Kc5 73. b4+ Kb5 74. Bd3+ Ka4 75. b5 Kb3 76. b6 Kc3 77. Be4 Kd2 78. b7 Rh8 79. Nc6 Ke1 80. Ke5 Kf2 81. b8=Q Rh5+ 82. Kxf4 Rh4+ 83. Kg5 Rh1 84. Ne5 Rg1+ 85. Kf4 Rd1 86. Qb2+ Ke1 87. Ke3 Rd2 88. Qxd2+ Kf1 89. Qf2# { White wins. } 1-0


  1. I just love to watch that clean beautiful chess

  2. Title: Impossible Tactical Sequence!
    Stockfish: Hold my beer.

  3. I liked how dragon played on the queen side but ofcourse stockfish handles it

  4. Loving the analysis as always, Jozarov.

  5. Four Knights Game / The nearer the bare the sweeter!

  6. very cleverly outplayed there by the fish.Thanks Josip and keep up the good work.

  7. at which point it becomes inequity ? I mean at what move or setup the advantage be appear

  8. Fantastic as always Jozarov!
    BTW, have you seen this (new-ish) channel:
    I wonder if you would do a collaboration with that guy sometime. Channel Description:
    "Silicon Road is all about chess engines! This channel will show you how to use chess engines like Leela and Stockfish as powerful training partners in the opening, middlegame and endgame, and help you improve your chess in exciting and modern ways. This channel also showcases the games of top engines such as Stockfish and Leela which feature powerful opening novelties, amazing tactics and fantastic technique! I’m grandmaster Matthew Sadler: a 2-times British Champion ranked in the world’s top 50 for many years and a prolific author. My latest book – The Silicon Road to Chess Improvement – which came out in October 2021 is, just like this channel, all about learning from and training with engines. My previous book, the award-winning Game Changer – written together with Natasha Regan – brought the amazing chess games of DeepMind’s AlphaZero to the world. "

  9. I thought Black's f4 was probably an error, but would need to do a deep analysis. Weakening the g4 square allowing White's king to attack the backwards g5 pawn was the key moment- Black could no longer defend all the pawns.

  10. Dragon played also a great game, thanks for covering this amazing game Jozarov

  11. 31. ….Rb1, doesn't that force a perpetual?

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