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Practise the Naked Triple
Three cells sharing three candidates between them lock those digits away.
8 real positions, each taken from an actual puzzle at the moment this was the cheapest move available. Two steps: find the cells that form the pattern, then find the candidate it rules out. A near miss tells you how many you had right, so getting it wrong is worth something.
| 8 | 5 | 1 | 37 | 27 | 347 | 24 | 9 | 6 |
| 9 | 4 | 2 | 1 | 8 | 6 | 7 | 5 | 3 |
| 3 | 7 | 6 | 59 | 29 | 459 | 8 | 1 | 24 |
| 2 | 8 | 5 | 6 | 79 | 79 | 3 | 4 | 1 |
| 7 | 9 | 4 | 2 | 3 | 1 | 6 | 8 | 5 |
| 1 | 6 | 3 | 4 | 5 | 8 | 9 | 2 | 7 |
| 5 | 3 | 7 | 89 | 1 | 29 | 24 | 6 | 248 |
| 6 | 2 | 8 | 35 | 4 | 35 | 1 | 7 | 9 |
| 4 | 1 | 9 | 78 | 6 | 27 | 5 | 3 | 28 |
How to spot it
Look for three cells in a house with two or three candidates each, and check whether their union is exactly three digits. The partial shapes are the ones worth training your eye on.
Full explanation on the Naked Triple reference page.
Practise something else
- Naked Pair Two cells in a house holding the same two candidates lock those digits away from the rest.
- Naked Quad Four cells sharing four candidates between them. Rare, and usually preempted.
- Hidden Triple Three digits restricted to the same three cells clear everything else out of them.