Crafting a Simple Sudoku Solver. The topic of this blog post is

The topic of this blog post is how to go about solving an arbitrary Sudoku puzzle. Sudoku is a game where one has to fill in a 9x9 box with numbers, subject to certain constraints. Sudoku proceeds by…

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Please give me a hint on how to continue. The app suggests a Hidden unique rectangle but that strategy is making use of the assumption that the puzzle has a unique solution.

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