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If the only instances of a candidate within a box are in the same row or column, you can eliminate candidates of that value from any other cell in the respective row or column. Consider the above example. In the bottom-right box the only two 9's are in the same column. Thus the candidate 9 can be eliminated from the bottom-middle cell of the top-right box because it is also in that column.
Because the only result of this technique is the elimination of a candidate, it requires either all the candidates to be filled in or the direct result of a hidden single to be spotted. Sudoku Snake gives it a skill value of 9.
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