Author: Omid David Tabibi
Date: 06:16:15 02/05/05
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On February 04, 2005 at 10:20:45, GuyHaworth wrote: > >The 'broken' index positions in Eugene's index-scheme are for: > >- positions where the side _not_ to move is in check, and/or >- two men are 'placed' on one square, or >- the index position is not used > >As noted elsewhere, the number of index positions is (in some cases, crucially) >reduced by avoiding creating checks not blockable by the placement of further >men on the board. > > >Are the the positions cited legal but unreachable from the conventional starting >position for (Western) Chess? > > >In some variants of W Chess, e.g. FRC as cited, the positions may be of >interest. Come on Guy, we will understand what you are referring to even if you don't add the "W" before the word "Chess" :) > >Anyway, spotting all the unreachable positions is hard, and therefore comparison >of one EGT's stats with another's is less likely. > > >Where the unreachables often show up is in maximal positions, e.g. KQPKQP with >the P giving check from its home square, see P. Karrer's ICGA paper post the >Kasparov-World game. > >g
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