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Subject: Re: Positional mistake, which computers avoid it?

Author: Jeremiah Penery

Date: 22:55:07 04/13/00

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On April 14, 2000 at 01:31:12, Pete Galati wrote:

>On April 13, 2000 at 18:00:21, José de Jesús García Ruvalcaba wrote:
>
>>[D]r1b2rk1/5pbp/p7/1P1P2q1/2B1pp2/N7/PP2QPPP/R4R1K b - - 1 19
>>
>>	Black played 19... Qxg2+?, winning an exchange but giving up a dangerous and
>>promising attack.
>>	Which programs are able to avoid this mistake?
>>José.
>
>At the search depths that I was able to reach, Crafty did Qxg2+, but Amy avoided
>it for some reason, maybe with a deeper search Amy would have taken the pawn
>with the Queen too.  I'm trying to figure out why not 19....f3 forking white's
>Queen and the pawn blocking the King, is there a reason the programs hate that
>idea?
>
>Pete
>
>    Amy version Winboard Version 0.7, Copyright (C) 2000 Thorsten Greiner
>    Amy comes with ABSOLUTELY NO WARRANTY; for details type 'warranty'
>    This is free software, and you are welcome to redistribute it
>    under certain conditions; type 'distribution'
>
>    Multiprocessor support (1 CPUs).
>
>$Id: score.c,v 1.44 2000/03/21 15:18:58 thorsten Exp $
>$Id: search.c,v 1.57 2000/03/22 10:19:02 thorsten Exp $
>
>Hashtable sizes: 16384 k, 2048 k, 2048 k
>Found 4-men endgame table bases.
>
>White(1): White(1): TC: 60 moves in 300 secs
>TL: 4/16
>GamePhase: Opening
>It    Time   Score  principal Variation
> 1     0.0  -0.080  1. Na3
> 1     0.0     +++  1. Nc3
> 1     0.0  +0.160  1. Nc3
> 1     0.0  +0.160  1. Nc3
<SNIP>
>11    6:45     +++  1. Nc3
>11    8:38  +0.128  1. Nc3 d5 2. Nf3 d4 3. Nb5 Nc6 4. e3 e5 5. exd4 exd4 6.
>                    Bc4
>11   10:46     +++  1. Nf3
>11   10:59  +0.144  1. Nf3 Nf6 2. e3 d5 3. Be2 Nc6 4. O-O Bf5 5. Nc3 d4 6.
>                    Nb5
>11   11:08  +0.144  1. Nf3 Nf6 2. e3 d5 3. Be2 Nc6 4. O-O Bf5 5. Nc3 d4 6.
>                    Nb5
>Nodes = 8381706, QPerc: 69 %, time = 836.51 secs, 10.0 kN/s
>Extensions: Check: 95030  DblChk: 27  DiscChk: 203  SingReply: 4955
>            Recapture: 57676   Passed Pawn: 0   Zugzwang: 0
>Hashing: Trans: 110480/2568919 = 4 %   Pawn: 4145759/4556964 = 90 %
>         Eval: 1255804/5812768 = 21 %
>EGTB Hits/Probes = 0/0
>Hashtable 1:  entries = 1048576, use = 296073
>White(1):
>
>I'll be back.

This search looks like it was run from the initial position, not the given
position...



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