[Retros] En-passant chess

Noam Elkies elkies at math.harvard.edu
Sun Mar 25 16:45:27 EDT 2007

Franco wrote:

> Anyway, when you'll compose the first En Passant Chess problem,

> I'll glad to enjoy it.

Not so much a composition as a translation of an old puzzle:

White Royal Pawn h7, Black Royal Rook a1 (1+1)
Checkless En Passant Chess: direct stalemate in 13

If I count right there are 924 full-length variations...
How many distinct mutual Zugzwang positions?


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