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Subject: Re: Bug in CHEST - CHEST doesn't see a mate in 2

Author: Roy Eassa

Date: 08:55:07 04/28/02

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On April 28, 2002 at 08:00:15, Vincent Vega wrote:

>Simplified position to show the bug:
>[D]8/8/8/8/8/8/4KP2/R1Qn3k w - - 0 1
>
>This is a mate in 2 (1. Qxd1+).
>
>But CHEST says:
>
>CHEST version 3.19, 18-Dec-1999
>Input file: 'xx'
>Reading job:
>#	xx
>W:  Ke2 Qc1 Ra1 Pf2 (4)
>B:  Kh1 Nd1 (2)
>FEN: 8/8/8/8/8/8/4KP2/R1Qn3k w - -
>analysing (mate in 2 moves):
>No solution in 2 moves.


My copy says there's a mate in 3, giving the following output:

8/8/8/8/8/8/4KP2/R1Qn3k w - - acn 591; acs 0; bm Kf1 Kf3 Qa3 Qc3 Qc7 Qe3 Qf4 Qg5
Qxd1+ Ra3 Ra4 Ra6 Ra7 Ra8; ce 32762; dm 3; pv Qxd1+;


Input file was this line:

8/8/8/8/8/8/4KP2/R1Qn3k w - - dm 8;


Strange!



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