The most difficult mate in 3 on the chess.com puzzle database : r
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What is the hardest mate-in-3 puzzle? - Quora

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The most difficult mate in 3 on the Lichess puzzle database : r/chess

Mate in 3 Puzzle (Quite Hard)

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The 3 HARDEST Chess.com Puzzles

Tactics Time!: 1001 Chess Tactics from the Games of Everyday Chess Players: Brennan, Tim, Carson, Anthea: 9789056914387: : Books

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Hard Chess Puzzle # 0068
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