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Stockfish (Computer) vs AlphaZero (Computer)
AlphaZero - Stockfish Match (2018), London ENG, Jan-18
Bishop's Opening: Blanel Gambit (C23)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
Jan-11-19
Premium Chessgames Member
  offramp: Another Frankenstein-Dracula from those modern cybermonsters, A0 & SF.

16. 0-0 h4.


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White has a ♖ and a ♙ for a ♘, but Black has a lot of play.
******
A few moves later Black has all sorts of threats.


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23. d4 Nd2.
Attacking queen, bishop, rook...
24. Qxb7!
Game on!
This move kills the black attack stone dead. White is slightly ahead in material after
26. Bxd2.


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*****
There is a huge amount of play, almost all of it interesting, and we reach this position:


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153...Qe3+
154.Kg2 Qe4+
155.Kf2 d3
156.Rxf4! White was in trouble.
*****
At move 170 we have this ending,


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Which A0 was unable to win.

Jan-11-19
Premium Chessgames Member
  Penguincw: I don't know how up to date it is, but I'm surprised that per Endgame Explorer: BB vs Q, there has only been one Q vs. BB ending before, ending in a win for the queen: P Thoren vs V Faibisovich, 1998.

I believe most of the time the queen does win, but it may take more than 50 moves.

Jan-11-19  RookFile: Reuben Fine said it should be a draw in Basic Chess Endings. Of course computers are rewriting a lot of the rules these days.
Jan-12-19
Premium Chessgames Member
  keypusher: A tablebase can tell you whether a Q v. 2BB ending is won or not, and how quickly. In this match SF had its tablebases enabled; A0 doesn't have a tablebase.

From offramp's last diagram the TB says it's mate in 69 moves if SF plays the best move, 171.Bd5, which of course it does. In the final position after 219....Qa1+, mate is 74 moves away. So, however good A0 may be, it's not as good as a tablebase. (Sort of like the tennis player who quit the game because he was never going to be as good as a wall.)

I wondered why DeepMind had the engines play on in tablebase positions, but it may be just because they wanted to see how A0 would compare to a tablebase. But they also had the engines play 50 moves in a position with only two kings and (opposite-color) bishops. So they may not know from a tablebase.

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