Hidden Triple

Three digits fit only the same three cells in a unit.

Learn the Hidden Triple Sudoku technique: three digits confined to three cells let you remove every other candidate from those cells.

How to use it

1. Track three digits. Find three digits in a unit whose possible positions fall within the same three cells.
2. Confirm the hidden triple. Those three digits are locked to those three cells, regardless of any other candidates listed there.
3. Clean the cells. Remove all other candidates from the three cells.