Example of a Buried Triple
This is a screenshot
Three Squares in the same
that contain the same three
Possibles - and the Possibles occur nowhere else
in that same Row, Column, or Box.
In this example, the Buried Triple is the three Squares containing the Possibles 3, 4 and 8 (coloured black).
These three Squares MUST contain 3, 4 or 8. Therefore they cannot contain any other Possibles. The 1, 6 and 9
outlined in orange are impossible solutions and can be removed.