Chess Puzzle #81813

CHESS PUZZLE #81813

Added by:	blitzkov
Added on:	03-Nov-12
Description:	Composed by William Campbell, "Avid Problems" 11/03/12
Difficulty:	online chess puzzle #81813
Attempts:	22
Solved:	9 (40%)


White to move, mate in 2

Comments: (5) » Last

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fkohn
03-Nov-12, 19:19

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Doesn't this problem violate current retrograde convention? Surely it is not possible to prove what Black's last move must have been.

hdgpille
03-Nov-12, 19:36

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nice puzzle

blitzkov
03-Nov-12, 20:55

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fkohn,

I don't think so. En-passent is legal in composition.

fkohn
04-Nov-12, 05:28

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It has to be demostrated that Black's move had to have been e7-e5 for this to pass muster by current convention.

fkohn
04-Nov-12, 05:37

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from http://www.janko.at/Retros/Glossary/EnPassant.htm

"The default convention is that, in a given position, if you can't deduce whether a potential en passant is legal or not, then it is not permitted. I.e., if uncertainly exists, you may assume that the last move was not the relevant double pawn move."

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CHESS PUZZLE #81813