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Solution is shown in the illustration.
Historical information by professor David Singmaster, England, shows
how old this puzzle is. It appeared in the following manuscripts:
- King's Library MS.13, A, xviii, c.1275;
- Nicholas de St. Nicholai (attrib.): "Bonus Socius" - collection of
chess problems, c.1275;
- at-Tilimsani, 1446. |
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