A Naked Triple is slightly more complicated because it does not always imply three numbers each in three cells.Any group of three cells in the same unit that contain IN TOTAL three candidates is a Naked Triple. Each cell can have two or three numbers, as long as in combination all three cells have only three numbers. When this happens, the three candidates can be removed from all other cells in the same unit.
The combinations of candidates for a Naked Triple will be one of the following: The last case is interesting and the advanced strategy XY-Wings uses this formation. (123) (123) (123) (123) (123) (12) (123) (12) (23) (12) (23) (13)
To see a Naked Triple in action look at this center strip from an example board:
We have a triple in columns 1, 8 and 9. There are three other squares with 5,7 and 8 so we can clear them off leaving:
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