We can certainly extend Naked Pairs to Naked Triples. Any three cells in the same unit that contain the same three candidate numbers will be a Naked Triple. The rest of the unit can be scrubbed clean of any of those numbers.
But a Naked Triple is much more versatile than this rule implies. In fact it is not necessary for there to be three candidates in each cell. As long as there are *in total *three candidates in three cells. Obviously we’re not going to apply this rule to single candidate cells – since they are solved, so the possible combinations are as follows:
The combinations of candidates for a Naked Triple will be one of the following: |
(123) (123) (123)
(123) (123) (12)
(123) (12) (23)
(12) (23) (13) |
The last case is interesting and the advanced strategy XY-Wings uses this formation (but that’s skipping way ahead).
Let’s look at an example: |