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How many unique checkmates are there from this starting position?

I can only see 5 lines on lichess from a game I've played and have tried several different moves.

Mate in 4 is the fastest but I've seen up to 12. There must be at least 15 different mates, not all of them have the same ending position.

[Title "Black to move"]
[fen "8/p2rk3/1pQ1p1p1/2p5/1P2P3/2PP1n2/P2bq3/RK1R4 b - - 0 1"]
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    Practically infinite. Take the rook and trade off material, then keep shuffling your pieces indefinitely.
    – shawn_xu
    Aug 10 at 21:11
  • @shawn_xu there is still a limit to how long a chess game can go on, 50 moves without capture are considered to be a draw.
    – charles2239
    Aug 10 at 21:38
  • Still one side has to claim a draw before the game officially ends.
    – shawn_xu
    Aug 26 at 2:15

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