A very, very, very old fashion solution (one step, with AIC, ALS's, what horrors !):
- Code: Select all
+----------------------+--------------------+--------------------+
| 23 567 123567 | 237 124 347 | 23458 48 9 |
| 8 9 123 | 6 124 5 | b234 7 b23 |
| 4 57 2357 | 9 8 37 | 35-2 6 1 |
+----------------------+--------------------+--------------------+
| 6 1 79 | 5 3 2 | 789 89 4 |
| 23 47 2347 | 8 6 9 | 1 5 27 |
| 5 8 29 | 4 7 1 | a29 3 6 |
+----------------------+--------------------+--------------------+
| 9 2 46 | 37 5 347 | 367 1 8 |
| 7 3 8 | 1 49 6 | a49 2 5 |
| 1 456 456 | 237 249 8 | 367 49 37 |
+----------------------+--------------------+--------------------+
(2=94)r68c7 - (4=23)r2c79 => -2 r3c7; ste