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Stockfish (Computer) vs Komodo (Computer)
Season 7 - Superfinal (2014), TCEC, rd 55, Dec-26
Queen's Gambit Declined: Westphalian Variation (D51)  ·  1-0



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Kibitzer's Corner
Mar-15-15  ColdSong: Nice game between the two chess bulldozers.Stockfish's positional mastery impresses.
Mar-16-15  Sally Simpson: Any of you lads have either program.

What does the computer make of this:

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White to play and draw.

Apparently computers are finding it tough to come to grips with it but not seen these two mentioned.

It's sound. White can draw this.

Mar-16-15  drleper: <Sally Simpson> Nice position! If the idea is to play Bg5+ (keeping the black king behind the pawns), advance the d pawn to d6 (or otherwise open the a1-h8 diagonal for the dark squared bishop to catch the a pawn), then leave the white king on g2 or g1 guarding h2 (shuffling the bishop if need be), then no, neither Stockfish 6 or Komodo 6 can evaluate it correctly. They don't recognise that black can't make progress there, and just check endlessly with an eval of around -8.
Mar-17-15  Murky: Amazing! There is no way to stop the black 'a' pawn from queening. But the black queen alone will not be sufficient to mate or win decisive material. Starting with Bg5 check, Ke8, d4, a3, d5, a2 (if ed e6 and white has Bf6 next), d6 (locking in all the black pieces except the queen), a1Q, Kg2 and the Black queen can only make spite checks; there is no mate or win of material to be found. Lovely composition. Enjoyed it; thanks!
Mar-17-15  Sally Simpson: Thanks.

I at first thought the position was wrong then remembered by Sherlock Holmes.

"When you have eliminated all which is impossible, then whatever remains, however improbable, must be the truth."

So let Black carry out his threat by Queening the pawn. What then?

I was thinking the machines may toil with this till they are left on long enough to spot a three fold rep.

Mar-17-15  RookFile: Nice positional play by Stockfish in this game. Reminds me of Karpov.
Mar-17-15  drleper: <Sally Simpson> I left Stockfish 6 running for quite a while (at least 30 minutes) on the position after black queens the pawn, and the penny never dropped :P
Mar-17-15  Sally Simpson: Hi drleper,

I know computers have trouble with fortress's, this looks like another one of those one a million positions where the human can see the result in a glance (after they have figured out the answer) yet a computer gets stuck.


Mar-18-15  MarkFinan: Once black gets checked by the bishop he has to play ke8 a white square because any other square and it frees whites dsb up to stop the a pawn. Black can still go ahead and promote the a pawn but it will end in the 50 move draw rule because...

click for larger view

Black can't free up his bishop.

Well spotted. That's a game I would have definitely resigned! The engine still has black up +8.00ish, but it's obviously on points and has no bearing on the outcome of the game.

Jul-09-15  apexin: This looks like Cambridge springs variation. I never heard of Westphalia opening before.
Apr-12-16  offramp: Black had a Westphalia failure.
Apr-12-16  Joseph Blackcape: Regarding last year's posts about computers, this is so true. Just this year I was having trouble with a few positions that seemed drawn to me (sooner or later), but I wanted to know for sure. So I would load them in Rybka and it would show something like +5 for one side and then when checking the lines it would end up making 50 or 70 pointless moves that would never amount to anything (like a multitude of spite Queen checks here), but all the time showing +5 for one side.
Apr-25-17  j4jishnu: This is probably the best way to play the Queen's Gambit Declined. Thank you computational supremacy. I wish Chess Super Grand Masters like Carlsen, So, Yifan, Anand, Nakamura and Krajkin be involved in Stockfish project to make it stronger. Long Live Free and Open Source Software. Long Live Chess.
Premium Chessgames Member
  HeMateMe: I wonder why black played 42...b5. It seems to let white break into the position.

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