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[Edit: D M found an error in my solution. The key reductions are correct but I missed a branch for Black (9. .. Be4) that evades all of those reductions.] I think I found the solution (16 moves on each side): [Title "White Self-mate"] [FEN "kbQ5/pb6/P7/3B4/8/7p/7p/7K w - - 0 1"] 1. Be4 Bc6 ( 1... Bd5? 2. Qh8 Bc6 3. Bd5 Bb7 4. Bc6 Bxc6#) ...


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