After very slow progress, managed to get today's X-treme to this spot - then completely stuck. Think I've found an ALSxz elimination which solves the puzzle. Please don't let me be tricked again .
A =[r4c147], B=[r4c9, r5c8, r6c9], X=1, Z=9 =>[r4c8]<>9
Code: Select all
.------------.------------.------------.
| 3 9 4 | 6 1 2 | 57 57 8 |
| 6 8 7 | 5 4 3 | 19 2 19 |
| 5 1 2 | 79 8 79 | 4 6 3 |
:------------+------------+------------:
| 78 4 5 | 79 23 6 | 18 39 127|
| 2 3 1 | 8 5 79 | 6 79 4 |
| 78 6 9 | 1 23 4 | 58 35 27 |
:------------+------------+------------:
| 1 2 3 | 4 6 5 | 79 8 79 |
| 4 7 6 | 2 9 8 | 3 1 5 |
| 9 5 8 | 3 7 1 | 2 4 6 |
'------------'------------'------------'