this post was submitted on 22 Oct 2023
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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?
2 black bishops on black tiles
Couldn't you accomplish that with promoting a pawn?
Not while leaving 8 pawns in play
Which pawn got promoted?