Sudoku Tutorial
Hidden Triple

A hidden triple occurs when three candidates in a house are confined to
just three cells and those three cells also contain other candidates.  
The 2,3, and 7 are confined to the three yellow cells.

The other candidates on those three cells can be eliminated.  


Its probably easier to spot the naked triple (159) in the same row.   It will
perform the same eliminations.

Click here for more information on naked vs hidden techniques
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