Three steps:
- Code: Select all
+---------------------+------------------------+-----------------------+
| 1 2 3 | C79-4 4568 5678 | J469 789 4678 |
| 4 9 5 | 27-1* 168 678 | 16 1278 3 |
| 6 7 8 | 3 14* e29* | 5 129 f24* |
+---------------------+------------------------+-----------------------+
| 59 Gg456 2 | 8 7 3 | I1469 159 Hf46 |
| 578 g58 1 | 6 9 4 | 3 2578 278 |
| F3789 G3468 49 | 5 2 1 | I469 789 4678 |
+---------------------+------------------------+-----------------------+
| E239 a13-4 7 |DA1249 134 EAd29 | 8 6 5 |
| 2358 b1358 6 |Ac12 1358 58 | 7 4 9 |
| 589 g458 49 | B479 4568 5678 | 2 3 1 |
+---------------------+------------------------+-----------------------+
1. (1)r7c2 = r8c2 - (1=2)r8c4 - r7c6 = r3c6 - (2=46)r34c9 - (6=584)r459c2 => -4 r7c2
2. H-Wing (*): (1=4)r3c5 - (4=2)r3c9 - r3c6 = (2)r2c4 => -1 r2c4
3. [(4=129)b8p134 - r9c4 = (9)r1c4] = (9)r7c4 - (9=23)r7c16 - r6c1 = (36)r46c2 - (6=4)r4c9 - r46c7 = (4)r1c7 => -4 r1c4: ste