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White to move and mate in... uhh... how did we get here? (sh.itjust.works)

submitted 8 months ago* (last edited 8 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 13 points 8 months ago (15 children)

I've often wondered if it's always possible to tell whether any arbitrary boardstate is possible, and I came up with a few easy ways to tell how the board can't be legal without verifying that no set of moves can lead to it. Can you spot every illegality?

[–] [email protected] 3 points 8 months ago* (last edited 8 months ago)

The ones I have: touching kings (and so many checks on the black king even though it's not his move), pawns on the first/last rank, 3 bishops even though no pawns have left the board

Edit: the h pawns passed each other

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