International Chess Federation on Twitter: "White to move and mate in two. 🧩 This problem composed by John Griswold White was published in "Canadian Illustrated News" in 1879. John G. White (1845-1928)
What is the hardest mate-in-2 puzzle? - Quora
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Mate in 2 moves puzzles 21 to 30
checkmate - What is the solution to this mate in 2 puzzle? - Chess Stack Exchange