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Subject: Re: crafty's strange blunder

Author: Robert Hyatt

Date: 07:52:46 09/07/99

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On September 07, 1999 at 10:01:08, blass uri wrote:

>On September 07, 1999 at 09:20:05, blass uri wrote:
>
>>On September 06, 1999 at 17:52:31, James T. Walker wrote:
>>
>>>Here is game 7 as mentioned in the subject line.  This is an interesting game
>>>because of the uneven material of Q vs RBN.  Usually the 3 pieces win this type
>>>game.  The 3 pieces in the hands of a computer become a multi-arm monster.
>>>Crafty now leads the match 5-2.
>>>
>>>
>>>
>>>
>>>[Event "40/2"]
>>>[Site "?"]
>>>[Date "1999.09.06"]
>>>[Round "7"]
>>>[White "Chess Tal II"]
>>>[Black "Crafty 16.15"]
>>>[Result "0-1"]
>>>
>>>1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 exd4 8.
>>>Re1 d5 9. Nc3 dxc3 10. Bxd5 Bb7 11. Bg5 Be7 12. Rxe4 f6 13. Bxf6 gxf6 14. Ng5
>>>fxg5 15. Qh5+ Kd7 16. Be6+ Kd6 17. Qh3 Nb4 18. Rd1+ Kc6 19. Rxd8 Raxd8
>>
>>r2R3r/1bp1b2p/p1k1B3/1p4p1/1n2R3/2p4Q/PPP2PPP/6K1 b - - 0 1
>>
>>I do not understand what is the reason that crafty did not play 19...Rhxd8
>>
>>My crafty16.6 as an engine for Junior wants to play Rhxd8 and after Raxd8? Bd7+
>>there is a significant drop in the evaluation.
>
>Tal also did a big mistake when it missed a draw in the game by 16.Qh3+ or
>16.Qg4+ but it is not surprising because when I look at the games I see that the
>wrong knowledge of tal pushes it to play bad moves.
>
>I want to know what was tal's evaluation when it played 16.Be6+?
>
>Uri


This is a common problem.  CST has a speculative eval, and I'd bet it was well
above zero here.  Which means it tries to avoid a draw, generally, until it is
too late.



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