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How long would it take for a game to reach a position wherein either side could selfmate? Pretend you pass by the board at that moment; you wouldn't know who has the move.

I found an answer in 13 plies. If it is optimal, proof of such will be accepted, whether rigorous or loose.

[FEN ""]

1. f3 f5 2. Kf2 Kf7 3. Kg3 Kg6 4. Kh4 Kh6 5. h3 Qe8 6. Qe1 Qg6 7. Qg3

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