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Stockfish (Computer) vs Komodo (Computer)
TCEC - Season 6 - Superfinal (2014), http://tcec.chessdom.com, rd 21, May-23
Sicilian Defense: French. Alapin Variation Haag Attack (B40)  ·  1/2-1/2

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Aug-15-14  MuzioFan: After all that fireworks there is a draw - what a game. Some say computers take the beauty out of chess, but matches like these prove otherwise!

Now let's see if I can understand what happened...

Aug-15-14
Premium Chessgames Member
  AylerKupp: FWIW, after 20...g6 Stockfish 5 at d=30 considered 21.Bxg6 to be the top move with an evaluation of [+0.13] after 21.Bxg6 Nxg6 22.Qxh5 Ncxe5 23.f4 Qd5 24.Re4 Nf3+ 25.Qxf3 Qf5 26.Qh5 Bxe4 27.dxe4 Qf6 28.Kg2 Qh8 29.Qxh8+ Nxh8 30.Nxd4 Bxd4 31.Bxd4 Rc2+ 32.Kf3 Ng6 33.h5 Nf8 34.e5 Rxa2 35.Ne4 Rh2 36.b4 Kg7 37.g4 Rh3+ 38.Ke2 Nd7, and deviated from its calculated best line by 24.Qh7+ instead of 24.Re4. And it considered 21.g4 and 21.Nf3 to be the next best moves with evaluations of [0.00] and [-0.18] respectively. So no wonder it went for 21.Bxg6.
Oct-30-14  MuzioFan: <AylerKupp>: The TCEC archive states that SF reached d=38 before making its 21st move, evaluating the position at [+0.00] with the continuation 21. Bxg6 Nxg6 22. Qxh5 Ncxe5 23. f4 Qd5 24. Re4 Nf3+ 25. Qxf3 Qf5 26. Qh5 Bxe4 27. dxe4 Qf6 <28. Ne1> Qg7 29. Nd3 Be7 30. Rd2 Rc7 31. Kf1 Bxg5 32. hxg5 Qh7 33. g4 Ne7 34. Ne5 Ng6 35. Qxh7+ Kxh7 36. Nd3 Ne7 37. Ne5 Ng6 (which, as you mentioned, it deviated from with <24.Qh7+>). Furthermore it reached 3.9k tablebase hits on move 21!

What a monster.

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