Image: Sudoku Puzzle (18 clue - R828-S09)

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Description: An 18 clue Sudoku with horizontal symmetry by Rico Alan, identified as "R828-S09".
Title: Sudoku Puzzle (18 clue - R828-S09)
Credit: Own work. Puzzle: Rico Alan - 18 Clue Sudoku "R828-S09" (Posted April 23, 2009).
Author: LithiumFlash
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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Sudoku solving algorithms

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