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Subject: Re: WAC question

Author: Dann Corbit

Date: 19:43:49 08/02/99

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On August 02, 1999 at 22:32:24, James Robertson wrote:

>On WAC #38:
>4k3/p4prp/1p6/2b5/8/2Q3P1/P2R1PKP/4q3 w - - bm Rd8+; id WAC038;
>My program favors the 'best move' for 9 plies, and then switches to Qd3 with a
>pv that wins the Q for the R exactly the same, just with a small positional
>difference. Is my program correct? Will Qd3 also win? Crafty gives similar
>scores for both moves.
>
>James
>
>Position #38
>Best move(s): Rd8+
>Unsolved.
>Depth  Score    Time       Nodes  PV
>   1     201       0          64  Rd8+ Kxd8 Qxe1
>   2     201       0         115  Rd8+ Kxd8 Qxe1
>   3     201       0         306  Rd8+ Kxd8 Qxe1
>   4     191      60         814  Rd8+ Kxd8 Qxe1 f5
>   5     211      60        1782  Rd8+ Kxd8 Qxe1 f5 Kf3
>   6     200     220       10024  Rd8+ Kxd8 Qxe1 Rg4 Kf3 Rd4
>   7     212     500       21773  Rd8+ Kxd8 Qxe1 Rg4 Kf3 Rd4 Qe5
>   8     208    2530      117508  Rd8+ Kxd8 Qxe1 Rg4 Qe5 Ra4 Qd5+ Ke7
>   9     217    4180      205169  Rd8+ Kxd8 Qxe1 f6 Qe6 Bd4 Kf3 Rd7 Qe4
>  10>    214   51910     2447229  Qd3 f5 Re2+ Qxe2 Qxe2+ Kf7 Kf3 Bd6 Qd2 Be5 Qc2
>  10     214   53060     2489505  Qd3 f5 Re2+ Qxe2 Qxe2+ Kf7 Kf3 Bd6 Qd2 Be5 Qc2

Here's the C.A.P. record (it is a 12 ply result):

4k3/p4prp/1p6/2b5/8/2Q3P1/P2R1PKP/4q3 w - - acd 12; ce 103; pv Qd3 Qe7 Re2 a5
Rxe7+ Kxe7 Qe2+ Kd6 Qd2+ Ke7 Qh6 Kf8 Kf3 b5 h3; pm Qd3; bm Rd8+; id "WAC.038";

Most likely a bug in the WAC EPD suite, but I would get some chess expert's
comments first before believing what a program has to say.



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