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Manuscripts and Archives Division, The New York Public Library. "Opening of text. Three problems, all solved, with both white and black pieces shown" The New York Public Library Digital Collections. 1424. https://digitalcollections.nypl.org/items/510d47da-e8bd-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. "Opening of text. Three problems, all solved, with both white and black pieces shown" New York Public Library Digital Collections. Accessed May 11, 2024. https://digitalcollections.nypl.org/items/510d47da-e8bd-a3d9-e040-e00a18064a99
Manuscripts and Archives Division, The New York Public Library. (1424). Opening of text. Three problems, all solved, with both white and black pieces shown Retrieved from https://digitalcollections.nypl.org/items/510d47da-e8bd-a3d9-e040-e00a18064a99
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Opening of text. Three problems, all solved, with both white and black pieces shown, (1424)|author=Digital Collections, The New York Public Library |accessdate=May 11, 2024 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>