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Sudoku: 300 Intermediate level puzzles 8.5 x 11 book# 3
Paperback
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ISBN13: 9798706702434
Publisher: Independently Published
Published: Feb 8 2021
Pages: 110
Weight: 0.60
Height: 0.23 Width: 8.50 Depth: 11.02
Language: English
Publisher: Independently Published
Published: Feb 8 2021
Pages: 110
Weight: 0.60
Height: 0.23 Width: 8.50 Depth: 11.02
Language: English
- Number puzzles appeared in newspapers in the late 19th century, when French puzzle setters began experimenting with removing numbers from magic squares. Le Siècle, a Paris daily, published a partially completed 9×9 magic square with 3×3 subsquares on November 19, 1892.[7] It was not a Sudoku because it contained double-digit numbers and required arithmetic rather than logic to solve, but it shared key characteristics: each row, column and subsquare added up to the same number.
- On July 6, 1895, Le Siècle's rival, La France, refined the puzzle so that it was almost a modern Sudoku and named it carré magique diabolique ('evil magic square'). It simplified the 9×9 magic square puzzle so that each row, column, and broken diagonals contained only the numbers 1-9, but did not mark the subsquares. Although they are unmarked, each 3×3 subsquare does indeed comprise the numbers 1-9 and the additional constraint on the broken diagonals leads to only one solution.[8]
- These weekly puzzles were a feature of French newspapers such as L'Écho de Paris for about a decade, but disappeared about the time of World War I.[9]
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