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Subject: Interesting position from Internet Chess Library main page

Author: Len Spencer

Date: 15:01:28 05/31/98

The other night I happened to look at the "mate in 2" problem on the ICL
home page, and decided to try it out on some of the programs I have.
Needless to say I got some interesting results.

The position:

5QbK/r6p/2pRp1p1/2P1k3/2B1npPN/r1p1N/6P1/q1b1R1B1 w

First I tried Crafty, thinking it should have no problem.  But it
INSISTED on Rxe6+ mate in 3.  So I tried several of the other programs I
have to see what they would do.  Here's what I found:

1.  (I won't give away the answer!)  Programs that got it right:
    CM4000
    GNU Chess 4.14 Win32
    Cyrus

2.  Rxe6+  (forced mate in 3)
    Crafty 15.8
    EXChess

3.  Qxg8 (mate in 3)
    Sargon 4
    Grandmaster Chess (Zarkov 2.5 engine)
    EdChess 3.0.

Any ideas?  Is the correct move getting lopped off early in the search
simply because it is a "waiting move"?

• Re: Interesting position from Internet Chess Library main page Robert Hyatt 17:04:55 05/31/98
• Re: Interesting position from Internet Chess Library main page Christophe Theron 16:46:24 05/31/98
  • Re: Interesting position from Internet Chess Library main page Len Spencer 04:45:02 06/05/98
  • Re: Interesting position from Internet Chess Library main page Dan Newman 17:43:38 05/31/98
• Re: Interesting position from Internet Chess Library main page Mark Young 15:50:55 05/31/98

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