Retrograde Analysis
Chess Problems
by Leo Mano
AR10 - Leo Mano (16x16) n1bqkbr1 - rpppppp1 - p6p - 8 - 8 - P4n1P - 1PPPPPPN - 1RBQKBRN Is this a legal check? Solution:
White is now in check, hence Black moved last. It's impossible! White: a3=Odd, h3=Odd, b1=Odd, g1=Odd, h2 plus h1=Even. Total=Even. Black: a6=Odd, h6=Odd, h7=Odd, g8=Odd, h8 plus f3=Odd. Total=Odd. Then the next move is black and the position is illegal. My first problem after has knowed Retrograde Analysis in the Raymond Smullyan's The Chess Mysteries of Sherlock Holmes. |
(p)2000-2001 by Leo Mano. Rio de Janeiro - RJ, Brazil. |