Practise: Naked Triple
This puzzle is picked so that the easy moves run out and exactly the Naked Triple gets you going again. Solve as far as you can — when nothing obvious is left, the pattern is waiting for you.
Skip the obvious cells and start right where the technique is needed.
How to spot it
Look for units with several two- and three-candidate cells. Take three of them and combine their candidates. If the union has exactly three distinct digits, you have a triple. The partial forms are the ones people miss, so check combinations rather than looking for three identical cells.
Put it to use
Where you will meet it
Medium grids are where this move starts to matter: the obvious cells run out and the pattern takes over.
Play MediumStuck on a grid of your own?
Type the position into the solver and it walks the whole solution, naming the technique behind every step — including this one.
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