What is the hardest mate-in-3 puzzle? - Quora
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What is the definition of checkmate? Can a player still win if they are trying not to be checkmated? - Quora

The hardest chess problem ever? Seems simple at first, but I bet no one will manage to solve it. : r/chess
What are some of the insane calculations in chess? - Quora
What is the hardest mate-in-3 puzzle? - Quora
How to fool's mate in chess - Quora
What are some of the toughest chess puzzles? - Quora
What is the toughest puzzle book? - Quora

What is the hardest mate-in-3 puzzle? - Quora
What is the hardest mate-in-2 puzzle? - Quora
Can you win from any position in Chess? - Quora
Is there such a thing as a difficult mate in one? - Quora
What is the hardest mate-in-2 puzzle? - Quora
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