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HoDoKu: Solving Techniques - Hidden Subsets (Hidden Pair, Hidden Triple, Hidden Quadruple)
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For a completed 9x9 Sudoku puzzle, what is the minimum number of checks needed (e.g., valid horizontal or vertical lines or 3x3 boxes) to be absolutely sure that the solution is in
Does every validly posed Sudoku have at least one solution? If not, what is the minimum number of givens for it to be unsolvable? - Quora
HoDoKu: Solving Techniques - Hidden Subsets (Hidden Pair, Hidden Triple, Hidden Quadruple)
Sudoku Archives - Uni-Presse
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