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Subject: Re: A move commercial engines might get wrong !!

Author: scott farrell

Date: 06:55:26 01/05/03

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On January 05, 2003 at 02:51:17, Uri Blass wrote:

sounds good.

Do you have specific trapping code for knights?

Thanks for the refuation of the chess line from Robert, I am not that good a
player in general to find that.


>On January 04, 2003 at 14:39:40, scott farrell wrote:
>
>>This position occured in a game chompster vs dorky on ICC  (45 10 time control
>>practices for CCT5).
>>
>>[D]r3kb1r/pp1n1pp1/1qp1p2p/3n3P/2NP1B2/3Q2N1/PPP2PP1/R4RK1 b kq - 0 14
>>
>>My engine says NxB is slightly winning for black, it failed high big time at
>>only depth 8 !!!
>>sfarrellc(C) whispers: , D10/11(11): 0.29 : D5F4 , 25.176/48.0 secs
>>
>>Crafty says it is +3 winning for white.
>>Dorky(C) whispers: score=+2.61 depth=13 Knps=111 cpu=99% time=87.05s
>>
>>Here is crafty's annotation:
>>({9:+2.92} 14. ... Nxf4 15. Nxb6 Nxd3 16. Nxa8 Nxb2 17. Rab1 Ba3 18. Nc7+ Kd8
>>19. Na8 +-)
>>({9:+1.04} 14. ... Qd8 15. Bd2 N7b6 16. Ne5 Bd6 17. Rfe1 Qh4 18. Qe4 Qxe4 19.
>>Rxe4 Bxe5 20. Rxe5 +/-)
>>({9:+1.52} 14. ... Qb5 15. Bd6 Nb4 16. Qe2 Nb6 17. Bxf8 Kxf8 18. b3 Nxc4 19.
>>bxc4 Qg5 +-)
>>({9:+1.66} 14. ... Qa6 15. Nd6+ Bxd6 16. Qxa6 bxa6 17. Bxd6 N7f6 18. Rfe1 Rd8
>>19. Bc5 Nf4 +-)
>>({9:+2.03} 14. ... Qb4 15. Bd2 Qa4 16. Ne4 Qa6 17. Ncd6+ Bxd6 18. Nxd6+ Ke7 19.
>>Nc4 Qb5 +-)
>>
>>
>>NxB is a clear winner !!!! It was an easy win from there.
>>
>>How many other engines see this? It took 19 more moves to actually recover the
>>material that my engine could see coming !!!!
>
>I suggest that you download movei.
>It likes Nxf4 as the best move from depth 8.
>
>score is slightly positive when it finds it(+0.14 for black) but later it is
>changed to slightly negative score and back to slightly positive score at depth
>14.
>
>Uri



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