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Subject: Re: Repost from CTF... Easy mates? Mate in 1 or 2, but some hard to compute

Author: Andrew Williams

Date: 14:58:40 11/28/01

Go up one level in this thread


On November 28, 2001 at 17:49:57, Dann Corbit wrote:

>On November 28, 2001 at 17:43:14, John Merlino wrote:
>
>>Chessmaster 8000 finds all of them "instantly".
>
>It seems hit or miss for various engines.
>
>Yace and GLC handle them well.  Most programs croak on one or more of them.  By
>"croak" I mean either take a long time or crash or skip the problem or do some
>other weird thing.

PostModernist gets them all easily now, but position 4 did uncover a
nasty bug, which caused PM to crash. The bug was triggered by trying
to work out a passed pawn bonus when the opponent had > 15 pieces.

Here's my results on a busy Athlon 1200:

=====================
EPD TEST SET: easymates.epd - 20 seconds per position

ID easymates.epd.0001 - CORRECT in     1.12 seconds. nodes: 43311
ID easymates.epd.0002 - CORRECT in     0.68 seconds. nodes: 4
ID easymates.epd.0003 - CORRECT in     0.39 seconds. nodes: 17
ID easymates.epd.0004 - CORRECT in     0.33 seconds. nodes: 5
ID easymates.epd.0005 - CORRECT in     1.08 seconds. nodes: 94007
ID easymates.epd.0006 - CORRECT in     0.32 seconds. nodes: 4

RESULT: 6 Correct (6 positions @ 20 seconds). Points: -3

NODES per second 100419
======================

Cheers

Andrew



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