![White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/ChessPuzzles White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/ChessPuzzles](https://preview.redd.it/rl1ouxdcfqf71.png?auto=webp&s=4b7b8a50dc014e09d9ccf2f270aec7333b3f6a70)
White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/ChessPuzzles
![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 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](https://preview.redd.it/white-to-mate-in-549-prompt-there-is-a-knight-v0-qe6dsbg7z1q81.jpg?width=640&crop=smart&auto=webp&s=4392cf231507d490d6c3062d41bf71956763c171)
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 White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/chess](https://i.redd.it/ekbm70vsddm51.png)
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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![White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/ChessPuzzles White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/ChessPuzzles](https://preview.redd.it/22wgvb9ke8l71.jpg?width=640&crop=smart&auto=webp&s=594c377ff4b72d7940fc16a92b77165e1a632f8f)
White to move and force mate in 546 moves. The position is found in the Lomonosov 7-piece tablebase. : r/ChessPuzzles
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![Cliff Pickover on X: "A "mate-in-546" position, which with perfect play is a forced checkmate in 546 moves. https://t.co/XNjNTbhnuk https://t.co/syvblVv12w" / X Cliff Pickover on X: "A "mate-in-546" position, which with perfect play is a forced checkmate in 546 moves. https://t.co/XNjNTbhnuk https://t.co/syvblVv12w" / X](https://pbs.twimg.com/media/DPgYWuAUQAAWZtN.jpg)