Naked Triple
Three cells in a house between them using only three candidates lock those digits away from the rest.
How it works
- 1Find three cells in one house whose candidates, taken together, are just three digits — say {2,5,7}.
- 2No cell needs all three; {2,5}, {5,7} and {2,7} works just as well.
- 3Those three cells use all three digits between them, so strike 2, 5 and 7 from the rest of the house.