Triangle Rule
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The Triangle Rule:
The two green and the yellow field form a triangle. A 3 must be in one of the green fields.
Therefore there cannot be a 3 in the yellow field.
| 2 | 1 | |||||||||||
| 3 | 2 | |||||||||||
| 5 | 3 | |||||||||||
| 1 | ||||||||||||
The Triangle Rule:
The two green and the yellow field form a triangle. A 3 must be in one of the green fields.
Therefore there cannot be a 3 in the yellow field.