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Higher Order Avoidable Rectangles From sudokuwiki.org, the puzzle solver's site |
Consider this set of numbers here. {1,4,8} are solutions in a finished puzzle - the rest of the numbers have been removed. From the point of view of an Avoidable Rectangle the puzzle maker must make at least two of these numbers clues - and two different numbers at that. I've shown in green two example cells that will ensure there is a single solution. If none of these nine cells were clues then the puzzle solver would fine {1,4,8} in all those places and any combination would give a solution. So the puzzle maker is forced to insert at least two clues. |
Triple Deadly Pattern |