Author: Roy Eassa
Date: 10:15:58 06/27/02
Go up one level in this thread
On June 27, 2002 at 09:40:40, Georg v. Zimmermann wrote: >Hi, > >another not-so-trivial is > >WAC 213 > >[D]3r1r1k/1b4pp/ppn1p3/4Pp1R/Pn5P/3P4/4QP2/1qB1NKR1 w - - bm Rxh7+ > > > >How long does it take your program and the top to see that Rxh7+ is a mate in 15 >( at least thats what Sunsetter says ) ? > >This is IMHO especially interesting since it partly is a design decission. Rxh7 >is easily proven a draw. As long as the other moves are not searched to be >better (the next best Rxg7 is only a draw indeed I think) for some algorithms it >makes sense not to look how good Rxh7+ really is. Some variations: 1.Rxh7+! [1.Rxg7 Kxg7 2.Rxh7+ Kxh7 3.Qh5+ Kg8! only draws for White] 1...Kxh7 2.Qh5+ Kg8 3.Rxg7+ Kxg7 4.Bh6+ Kh7 5.Bg5+ Kg7 6.Qh6+ Kf7 [6...Kg8 7.Qg6+ Kh8 8.Bf6+ Rxf6 9.exf6 Rd7 10.Qe8+ Kh7 11.Qxd7+ and mates] 7.Qf6+ Kg8 8.Qg6+ Kh8 9.Bf6+ Rxf6 10.exf6 and mates similarly
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