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mrmip · 04-25-2008, 10:12 PM

The rules for chess problems are given in the *Codex* here:
Codex of Chess Compositions

Look up the Article 16 for castlings and en passant.

Certainly there are problems with en passant key. But in these cases it can be proven that the last move was a double step of a pawn.

04-25-2008, 10:12 PM	#6 (permalink)
mrmip Forum Rook Posts: 96 Thanked 5 Times in 4 Posts Chess Profile	The rules for chess problems are given in the Codex here: Codex of Chess Compositions Look up the Article 16 for castlings and en passant. Certainly there are problems with en passant key. But in these cases it can be proven that the last move was a double step of a pawn.