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Subject: Re: crafty's strange blunder

Author: blass uri

Date: 08:48:02 09/07/99

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On September 07, 1999 at 10:51:41, Robert Hyatt 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.
>>
>>Uri
>
>
>This is probably just a difference between 16.6 and the later versions.  My
>current version likes Raxd8 with a score of +1.08 after 30 secondson my
>notebook...  and the score doesn't change much as time wears on. ie +1.00 at
>depth=9,etc...

I see that it is a tactical problem for crafty.
If I give crafty16.6(engine for Junior) 2 options then it can see big difference
between Rhxd8 and Raxd8 only at depth 11(Rhxd8 is 1.83 pawns advantage for black
and Raxd8 only 0.22)

Uri



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