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Reverse Puzzle: What must have been the last move for each player for this position to be reached legally
(lichess1.org)
Solution:
Spoiler
- f4 gxf3+ 2. Kxf3+
this post was submitted on 13 Jul 2026
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However, since f3 is also covered by black's bishop, it is impossible for white's king to have been on that square before that ;) The very specific set of constraints make it so that this puzzle should really just have a single objective solution. (Solution is in the spoiler tag in the post body)