Box Rule (continued)
A box is not always rectangular:
| 1 | ||||||||||||
| 3 | 2 | |||||||||||
| 5 | 3 | |||||||||||
| 1 | ||||||||||||
In this case 2 can only be excluded from some of the neighboring fields.
A box is not always rectangular:
| 1 | ||||||||||||
| 3 | 2 | |||||||||||
| 5 | 3 | |||||||||||
| 1 | ||||||||||||
In this case 2 can only be excluded from some of the neighboring fields.