... by: Hassieb Wali
I can see pairs in the examples but no triples. Could you give an example of triples.Andrew Stuart writes:
Good idea, done






Intersection Removal If any one number occurs twice or three times in just one unit (any row, column or box) then we can remove that number from the intersection of another unit. There are four types of intersection:
If you are a fan of Jigsaw Sudoku puzzles, you may want to read the articles on Double Pointing Pairs and Double Line/Box Reduction which extend the ideas here but are strategies possible only in the Jigsaw variant of the puzzle. 
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