- Code: Select all
.5.1..8..1..2.74.......6.3221....5.3.........4.5....1873.4.......86.1..4..9..8.2.
An XY Wing in cells abc removes some '6's as shown
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*---------------------------------------------*
| 39 5 2 | 1 349 349 | 8 67 67 |
| 1 68 36 | 2 38 7 | 4 5 9 |
| 89 7 4 | 589 589 6 | 1 3 2 |
|---------------+---------------+-------------|
| 2 1 67 | 789 46789 49 | 5 679 3 |
| 38 89-6 37-6 | 79 1 5 | 2 4 a67 |
| 4 c69 5 | 379 23679 239 |b79 1 8 |
|---------------+---------------+-------------|
| 7 3 1 | 4 29 29 | 6 8 5 |
| 5 2 8 | 6 37 1 | 379 79 4 |
| 6 4 9 | 357 357 8 | 37 2 1 |
*---------------------------------------------*
And gets you to here after some basics.
- Code: Select all
*----------------------------------------*
| 39 5 2 | 1 349 349 | 8 6 7 |
| 1 68 36 | 2 38 7 | 4 5 9 |
| 89 7 4 | 589 589 6 | 1 3 2 |
|------------+---------------+-----------|
| 2 1 b67 | 789 46789 49 | 5 a79 3 |
| 38 89 37 | 79 1 5 | 2 4 6 |
| 4 c69 5 | 379 23679 239 | 7-9 1 8 |
|------------+---------------+-----------|
| 7 3 1 | 4 29 29 | 6 8 5 |
| 5 2 8 | 6 37 1 | 379 79 4 |
| 6 4 9 | 357 357 8 | 37 2 1 |
*----------------------------------------*
Another XY wing solves a cell and the puzzle.
Leren