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