- Row 7: the highlighted cells can hold only 3, 6, and 7.
- Each of 3, 6, and 7 must take one of these cells.
- Row 7: so 3, 6, and 7 can go nowhere else.
Naked Triple in sudoku
A Naked Triple is three cells of one row, column or box whose notes, taken together, are only three numbers. A cell need not show all three: notes of 2 5, 5 7 and 2 7 make a triple of 2, 5 and 7. The three numbers can be removed from the notes of every other cell of that row, column or box.
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How to spot it
Look for cells with two or three notes in one row, column or box, and check whether three of them share the same three numbers between them. Triples hide well when no cell shows all three numbers, so add up the notes rather than compare them.
Why it works
Three cells that can hold only three numbers must hold exactly those three, one each. None of the three numbers is left for the other cells of the unit.
On a real puzzle
This is Naked Triple on its practice puzzle, at the first step that needs it. The game's hint explains the step like this:
Practice it
This Master puzzle calls for Naked Triple. Fill in the singles first. When no number is obvious any more, look for the pattern, or ask for the hint: each game has one.