Author: Omid David Tabibi
Date: 01:55:17 01/10/03
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>Your positions are illegal. > >In the first position there are 32 pieces on the board and it means that there >were no captures so there were no promotions and it is impossible to have it >when the number of white queens is bigger than 1. > >In the second and third position there are 30 pieces but it is easy to prove >that all the white pawns need to promote to get 8 white queens and 2 white >bishops with the same color. > >It is impossible to promote 8 pawns when only 2 capture are allowed because >every capture can open at most 2 new files for promotion. > [D]k1K5/8/8/8/8/8/7P/6B1 w - - 0 1 White to move. Is the above position legal? If so, what were the last two moves? Source: The Chess Mysteries of Sherlock Holmes, by Raymond Smullyan.
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