Thank you for sharing your solutions!
My first go at this puzzle was in two steps:
After basics
- Code: Select all
.-----------------------------------------------------------------------------.
| 12 3 4 | 19 1269 1569 | 7 8 2569 |
| 8 129 1579 | 1479 124679 15679 | 4569 3 24569 |
| 27 6 579 | 3479 23479 8 | 459 1 2459 |
|-------------------------+-------------------------+-------------------------|
| 6 *14 3 | 2 8 17 | 145 9 457 |
| 147 8 2 | 5 14679 1679 | 1346 467 3467 |
| 9 5 7-1 | 147 1467 3 | 8 2 467 |
|-------------------------+-------------------------+-------------------------|
| 124 249-1 8 | 1379 5 179 | 3469 467 34679 |
| 3 7 *19 | 6 19 4 | 2 5 8 |
| 5 *49 6 | 8 379 2 | 349 47 1 |
'-----------------------------------------------------------------------------'
1. Y-Wing(149)r9c2,r4c2,r8c3 => -1 r6c3,r7c2 [3 placements and basics]
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- Code: Select all
,-----------------------------------------------------,
| 12 3 4 | 19 126 156 | 7 8 2569 |
| 8 129 159 | 1479 12467 156 | 456 3 24569 |
| 7 6 59 | 349 234 8 | 45 1 2459 |
|---------------+------------------+------------------|
| 6 14 3 | 2 8 7 | 145 9 45 |
|b14 8 2 | 5 469 69 |b1346 467 b37 |
| 9 5 7 | 14 146 3 | 8 2 46 |
|---------------+------------------+------------------|
|a124 249 8 | 37 5 19 | 69-4 6-4 c37 |
| 3 7 19 | 6 19 4 | 2 5 8 |
| 5 9-4 6 | 8 37 2 | 349 c47 1 |
'-----------------------------------------------------'
2. (4)r7c1 = (413)r5c179 - (3=74)b9p38 => -4 r7c78, r9c2; lclste