EXTREME #175
Original Grid: . . . | . . . | . 2 .
9 . . | . 6 . | . . .
8 . . | 7 . 1 | 3 . 4
-------+-------+------
. 9 . | . . . | 2 . .
. 2 7 | . . . | 4 5 .
. . 6 | . . 8 | . 7 .
-------+-------+------
. . 5 | 4 . 6 | . . 7
. . . | . 1 . | . . .
. 7 3 | . . . | . . .
After SSTS:
| 7
| 356
| 1
| 3589
| 4
| 359
| 5689
| 2
| 569
| | 9
| 35
| 4
| 2358
| 6
| 235
| 7
| 18
| 15 | | 8
| 56
| 2
| 7
| 59
| 1
| 3
| 69
| 4
| | 35
| 9
| 8
| 15
| 7
| 4 | 2
| 136
| 136
| | 1
| 2
| 7
| 6
| 39
| 39
| 4
| 5
| 8
| | 35
| 4
| 6
| 125
| 25
| 8
| 19
| 7
| 139
| | 2
| 1
| 5
| 4
| 389
| 6
| 89
| 389
| 7
| | 46
| 8
| 9
| 235
| 1
| 7
| 56
| 346
| 2356
| | 46
| 7
| 3
| 259
| 2589
| 259
| 15689
| 14689
| 12569
|
1) (9)r3c8=r3c5-(39=8)r57c5-(8=9)r7c7,=>r1c7/r79c8<>9
2) (8)r2c4=r2c8-(8=3)r7c8-r7c5=(3)r8c4,=>r2c4<>3.Ste
Time to solve: ~25 min
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