Author: James Robertson
Date: 17:01:19 09/20/99
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On September 20, 1999 at 19:11:43, Peter McKenzie wrote: >On September 20, 1999 at 16:15:46, James Robertson wrote: > >>On September 20, 1999 at 14:51:35, Robert Hyatt wrote: >> >>>On September 20, 1999 at 14:08:26, Jon Dart wrote: >>> >>>>Arasan doesn't generate rook or bishop underpromotions except at >>>>ply 0 (I think Crafty does the same thing). >>> >>> >>>No. Crafty generates all promotions in normal search, but only generates >>>queen promotions in the q-search. I think leaving out underpromotions is a >>>mistake in the regular search... but in the q-search only doing queens seems >>>reasonable if you don't handle checks and escaping from check. If you do, I'd >>>likely throw in knight promotions... >>> >>> >> >>My program only generates Queen and Knight promotions, as I have never seen a >>position where a Bishop/Rook promotion was any good.... I have run across a few > >Check out the Saavedra position - in my opinion one of the coolest known chess >positions. The position looks deceptively simple, the sort of position you >could easily imagine occuring in a real game. > >The solution has a couple of nice twists (including under promotion to a Rook). >If you like chess and don't know this position, you are in for a real treat. > >Check out: >http://www.xs4all.nl/~timkr/chess/saavedra.htm > >cheers, >Peter I'll reiterate my answer to Jeremiah: I'm aware of such positions, but have yet to see one in an actual game (and I've seen a _lot_ of games). James
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