Code: Select all
. . .|6 5 .|. . .
. . .|. . 7|. . .
. . 2|3 . 1|. 8 6
-----+-----+-----
8 . 6|. . .|. 5 1
1 . .|. . .|4 6 .
. 4 5|. . .|. . 3
-----+-----+-----
. . .|. 7 .|. . .
. . 1|8 3 .|. 4 9
. . 8|4 . 9|. 3 .
- Naked quad, digits 2,4,8,9 in r2345c5
Naked quad, digits 2,5,6,7 in r89c12
Hidden pair, digits 1,8 in r12c2
Skyscraper, digit 7 -- (7): r5c3 = r1c3 - r1c8 = r6c8 => r5c9, r6c1 <> 7
Sue de Coq, box 3, column 8:- Set C (line/box intersection) = r12c8, candidates 1,2,7,9
Set A (box) = r2c7, candidates 7,9
Set B (line) = r7c8, candidates 1,2
- Set C (line/box intersection) = r12c8, candidates 1,2,7,9
Code: Select all
·------------------·---------------------·----------------------·
| 3479 18 3479 | 6 5 248 | 123 B1279 B24 |
| 6 18 349 | 29 2489 7 | 1235 B129 B245 |
| 4579 579 2 | 3 49 1 | B79 8 6 |
·------------------+---------------------+----------------------·
| 8 2379 6 | 279 249 234 | 279 5 1 |
| 1 2379 379 | 2579 289 2358 | 4 6 28 |
| 29 4 5 | 1279 16 268 | 2789 79 3 |
·------------------+---------------------+----------------------·
| 349 39 349 | A125 7 A256 | 12568 C12 *28-5 |
| 257 2567 1 | 8 3 256 | 256 4 9 |
| 25 256 8 | 4 A16 9 | 1256 3 7 |
·------------------·---------------------·----------------------·
I don't think it's particularly important, but for those who like to classify according to conventionally defined patterns, the AIC below represents an ALS XY wing elimination. For more info on that pattern, see http://www.sudopedia.org/wiki/ALS-XY-Wing. The sets of cells A, B, and C used in that formulation are identified with corresponding prefixes in the diagram. These are precisely the sets of cells for the first, third, and second nodes, respectively, of the AIC:
- (5=162)r7c46|r9c5 - (2=1)r7c8 - (1=24795)r12c89 => r7c9 <> 5