Author: Joseph Tadeusz
Date: 04:24:29 02/09/06
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On February 09, 2006 at 06:19:30, h.g.muller wrote: >On February 09, 2006 at 05:32:46, Joseph Tadeusz wrote: > >>According to this endgame site: http://chess.jaet.org/cgi-bin/dtx >>optimal play doesn't use underpromotion at all! >> >>It gives this line as optimal: 1.c7! Rd6+ 2.Kb5! Rd5 3.Kb4 Kb2 4.c8=Q! > >But this is a deviation by black, which merely serves to delay the checkmate. If >underpromotion were forbidden, black would prefer the original defense, because >that would then lead to a draw. So underpromotion remains crucial for the >qualification of this position, even if it is not in the branch of optimal >defense. Rybka v1.0 32, wich can't underpromote, doesn't choose the original defense: 1. c7 Rd6+ 2. Kb7 Rd7 3. Kb8 Rxc7 4. Kxc7 Perhaps only two kings on the board is less of a draw than stalemate?
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