Author: Slobodan R. Stojanovic
Date: 16:45:21 07/07/03
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On July 07, 2003 at 19:40:47, Pierre Chevalier wrote: Shuffle Chess and Fischer Random Chess are two different modalities. SL. >There are only 480 positions in Shuffle Chess also known as FischerRandom. >The other half of the supposed 960 positions are mirror image errors. >It is standardly accepted that the king moves two squares to castle. >All shuffle chess positions can be represented with the king on c1, e1 or g1. >All other arrangements are left-right reversals. >When the king begins on c1 it castles to g1 or stays put. >When the king begins on e1 as normal it castles to c1 or g1. >When the king begins on g1 it castles to c1 or stays put. >In all these cases the rook will wrap around the king as standard. >The number 960 is the wrong number. To say there are 960 positions is to >count mirror images as if they represented new positions. Mirror image >arrangements do not represent a new format; they represent a mistake in >counting. In this case mirror image means reversing the order along the back >rank. >Consider the position RNBKQBNR. Is this a new position? No. >This is not a new position. >The variant shuffle chess creates 479 new positions in addition to the >standard chess position.
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