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Subject: Re: crafty 16.3 - something broken in K and P endgames?

Author: Richard A. Fowell (fowell@netcom.com)

Date: 23:43:23 01/30/99

On January 30, 1999 at 23:54:15, James B. Shearer wrote:

>       I was playing Fitter on ICC and was surprised when it let me escape with
>a draw in a K and P endgame.  I checked the key position afterwards with crafty
>16.3 (on a 233 k6 PC).  Crafty 16.3 takes 2 hours to find the winning move, h4,
>at ply 16 (see log below).  On the other hand crafty 15.15 finds h4 in 8 seconds
>at ply 10.  Fritz 4 also finds h4 in a few seconds.  Looks like you may have
>broken something.
>                                James B. Shearer
<snip>
>Crafty v16.3
>
>
>White(1): in fit40
>White(1): setboard 8/8/4p1p1/1p1pPk1p/p2Pp3/P1P3PP/1P2K3/8 b - - 0 40
>
>       +---+---+---+---+---+---+---+---+
>    8  |   |   |   |   |   |   |   |   |
>       +---+---+---+---+---+---+---+---+
>    7  |   |   |   |   |   |   |   |   |
>       +---+---+---+---+---+---+---+---+
>    6  |   |   |   |   | *P|   | *P|   |
>       +---+---+---+---+---+---+---+---+
>    5  |   | *P|   | *P| P | *K|   | *P|
>       +---+---+---+---+---+---+---+---+
>    4  | *P|   |   | P | *P|   |   |   |
>       +---+---+---+---+---+---+---+---+
>    3  | P |   | P |   |   |   | P | P |
>       +---+---+---+---+---+---+---+---+
>    2  |   | P |   |   | K |   |   |   |
>       +---+---+---+---+---+---+---+---+
>    1  |   |   |   |   |   |   |   |   |
>       +---+---+---+---+---+---+---+---+
>         a   b   c   d   e   f   g   h
>
>Black(1): exit
>
<snip>

Looks' that way. MacChess 5 on my 7300/180 Mac finds this in 20 seconds:

Saturday, January 30, 1999  11:37 PM

02/01|00:00:00|          71|  +47| g5 Ke3 g4 hxg4+ hxg4
03/01|00:00:00|         493|  +44| g5 Ke3 g4 h4 Kg6
04/01|00:00:00|        3514|  +47| g5 Ke3 h4 g4+ Kg6 Kd2 Kf7
05/01|00:00:00|       16394|  +44| g5 Ke3 h4 g4+ Kg6 Kd2 Kf7 Ke3 Ke7
06/01|00:00:01|      167729|  +47| g5 Ke3 h4 g4+ Kg6 Kd2 Kg7 Ke3 Kf7 Kd2 Ke7
07/01|00:00:02|      438808|  +47| g5 Ke3 h4 g4+ Kg6 Kd2 Kf7 Ke2 Ke7 Kd2 Kd7 Ke3
Kc6
08/01|00:00:12|     1972675|  +47| g5 Ke3 h4 g4+ Kg6 Kd2 Kf7 Ke2 Ke7 Ke3 Kd7 Ke2
Ke8 Kd2 Kd7
08/03|00:00:20|     3244749|  +71| h4 gxh4 Kf4 Kf2 e3+ Ke2 Ke4 h5 gxh5 h4 Kf4
Kf1 Kf3 Ke1 e2

Re: crafty 16.3 - something broken in K and P endgames? James T. Walker 07:49:35 01/31/99

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