Very good and hard to spot puzzle. White to move, mate in 4. : chess
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Mate in 4 Chess Puzzles: 1, 128 Examples from Historic and Modern Games: Harvey, Bill: 9781506084145: Amazon.com: Books
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The Hardest Puzzles from Hell Day 4 of 7. White to Move. Mate in 4. : chess
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Mate-in-4 Chess Puzzles
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Mate-in-4 Chess Puzzles
Checkmate In 4 Moves !!! Hard Chess Puzzle !!! Mate In 4 Moves Chess Problem !! - YouTube
Chess puzzle: C.C.W. Mann, 1907, white to mate in 4 moves : chess
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