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Retrograde analysis is the method of deducing information by working backwards from a given position or outcome. This information can be about past positions of the same game, or may contain forward content, such as optimal play.

3 votes

Where does the black king stand in this specific position?

Evarglo's answer is correct, but doesn't give any reasoning for why lines that involve queen-side castling are the only viable ones. The key to the puzzle is noticing that with the pawns in their curr …
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