This is THE DISAPPEARING BICYCLIST puzzle by 18th Century mathematician Sam Loyd. In position 'A' 13 boys are visible, but in position 'B' - only 12. One is invited to determine which
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WoodPuzzles - Sam Loyd's Square to Cross
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Map, Novelty, Get Off the Earth Puzzle, Cartographic Curiosity, Antique, 1918 – George Glazer Gallery, Antiques
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Sam Loyd - Can you solve this puzzle by the world's greatest puzzle creator Sam Loyd? You'll find this puzzle in our new Tom Tinker's Puzzles by Sam Loyd at the official
Puzzle Sum 19 - Puzzle Prime
Sam Loyd and His Puzzles (1928)" - Copyright J. A. Storer
WoodPuzzles - Sam Loyd's Square to Cross - Solution
