MATE ABAFADO!, By Se liga no chess
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White to mate in 549 (Prompt: there is a knight underpromotion on the 6th move). This is the longest possible forced mate in 7 or less pieces endgames. It was calculated by

White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/chess

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