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Subject: Good underpromotion test position

Author: Matthew White

Date: 12:04:25 07/10/03

Underpromotion position from
Chan - Depasquale
Laoag 1985
[D]6k1/8/4p3/4Pp1p/5P1P/3Rn2K/6p1/8 b - -

The only winning move is 1...g1=B!

For example, 1...g1=Q 2. Rd8+ Kh7 (or Kf7 Rd7+ Ke8 Rd8+ etc) 3. Rh8+ Kxh8 (or
Kg7 Rg8+ Kxg8 stalemate) stalemate.

Most engines see this, though it takes up to 8 ply or so most of the time...
wbNimzo2000 doesn't seem to be able to find the correct move. Nimzo8, OTOH,
does... Guess he found the bug :). Maybe it will help you find a bug too...

Regards,
Matt

Re: Good underpromotion test position Mike Hood 20:27:08 07/10/03
- Re: Good underpromotion test position Matthew White 00:45:42 07/11/03
Chess Tiger for PalmOS: 46 seconds Christophe Theron 16:38:11 07/10/03
pocket fritz 2 in 17 seconds !!!!!! george 15:13:59 07/10/03
Re: Good underpromotion test position Martin Bauer 15:06:56 07/10/03
Re: Good underpromotion test position Ernst Walet 13:18:23 07/10/03
- Re: Good underpromotion test position Steven J. Brann 18:08:18 07/10/03
Re: Good underpromotion test position Benny Antonsson 12:53:28 07/10/03
Re: Good underpromotion test position Matthew White 12:09:30 07/10/03

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