I always thought that I was any good at solving Su Doku puzzles, but then I bought Wayne Gould's Extreme Su Doku and now I'm feeling a bit of an idiot!
Here's where I've got to on puzzle #2 on that book (I've given up on #1!)
- Code: Select all
Puzzle:
. . . | 5 . 8 | . . .
. 1 . | 2 . 6 | . 8 .
3 . . | . 4 . | . . 2
------+-------+------
2 . 9 | . . . | 8 . 4
. . . | 4 . 2 | . . .
1 . 5 | . . . | 3 . 7
------+-------+------
6 . . | . 8 . | . . 1
. 5 . | 7 . 1 | . 4 .
. . . | 6 . 3 | . . .
Workings:
79 2679 2467 | 5 39 8 | 14679 13679 369
5 1 47 | 2 39 6 | 47 8 39
3 689 68 | 1 4 7 | 569 569 2
------------------+--------------------+-------------------
2 67 9 | 3 17 5 | 8 16 4
78 3678 3678 | 4 17 2 | 169 169 5
1 4 5 | 8 6 9 | 3 2 7
------------------+--------------------+-------------------
6 237 237 | 9 8 4 | 257 357 1
89 5 38 | 7 2 1 | 69 4 3689
4 2789 1 | 6 5 3 | 279 79 89
This is annoying the hell out of me because I'm sure I've checked all the doubleton's, x-wings, etc. But there's obviously something I've not checked yet, or got wrong with my workings... Any help much appreciated!