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Set E Puzzle 27

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Fri Dec 05, 2008 11:08 pm Post subject: Set E Puzzle 27

Code:

+-----------------------+
| . . . | . 4 2 | 1 . 9 |
| . 9 . | . 1 . | . 7 . |
| . . 7 | 3 . 5 | 4 . 2 |
|-------+-------+-------|
| . . 6 | 4 . . | . . . |
| 9 2 . | . 5 . | . . 3 |
| 7 . 3 | . . 9 | . . . |
|-------+-------+-------|
| 8 . 2 | . . . | . . . |
| . 6 . | . . . | . . . |
| 3 . 9 | . 2 . | . . . |
+-----------------------+

Play this puzzle online at the Daily Sudoku site

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sat Dec 06, 2008 3:21 am Post subject:

Another very enjoyable VH puzzle! I required two ERs, two xy-wings, two kites and one UR. I have to assume a couple were not actually required but they were still fun to find. It also had a good mix, for me, of VH techniques and basic clean-up. Ted

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Sat Dec 06, 2008 10:15 pm Post subject:

Code:

.---------------------.---------------------.---------------------.
| 56 3 58 | 7 4 2 | 1 68 9 |
| 2 9 4 | 68 1 68 | 3 7 5 |
| 16 #18 7 | 3 9 5 | 4 68 2 |
:---------------------+---------------------+---------------------:
| 15 15-8 6 | 4 378 1378 | 29 29 78 |
| 9 2 #18 | 168 5 1678 | 678 4 3 |
| 7 4 3 | 2 68 9 | 568 15 168 |
:---------------------+---------------------+---------------------:
| 8 *157 2 | 1569 367 13467 | 5679 39 1467 |
| 4 6 *15 | 1589 378 1378 | 25789 239 178 |
| 3 *157 9 | 1568 2 14678 | 5678 15 14678 |
'---------------------'---------------------'---------------------'

marked above is the w-wing {1,8} with hinge/group link on the 1's. this removes 8 from r4c2. that puts a hole in this for a while

Code:

.---------------------.---------------------.---------------------.
| 6 3 5 | 7 4 2 | 1 8 9 |
| 2 9 4 | 68 1 68 | 3 7 5 |
| 1 8 7 | 3 9 5 | 4 6 2 |
:---------------------+---------------------+---------------------:
| 5 1 6 | 4 378 378 | 29 29 78 |
| 9 2 8 |*16 5 *167 |#67 4 3 |
| 7 4 3 | 2 *68 9 | 568 15 16 |
:---------------------+---------------------+---------------------:
| 8 *57 2 | 1569 #67 1467 |56-79 3 146 |
| 4 6 1 | 59 378 378 | 259 29 78 |
| 3 *57 9 | 1568 2 14678 |56-78 15 146 |
'---------------------'---------------------'---------------------'

the UR {2,9} r48c78 is there
but...
another w-wing {6,7} via grouped strong link on 6 in box 5
now, the 7's in r7c5 and r5c7 eliminate the 7 in r7c7
then with some extension to the 7 in r7c2 to r9c2, elimates the 7 in r9c7

tlanglet

Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

Posted: Sun Dec 07, 2008 12:23 am Post subject:

storm_norm wrote:

Code:

marked above is the w-wing {1,8} with hinge/group link on the 1's. this removes 8 from r4c2. that puts a hole in this for a while

Norm that is a fantastic move! It is something that is now obvious but I have never consider it before. In fact, I was still thinking about it while I was working on another puzzle and the identical situation occurred so I had to immediately sent this post.

Great going!.

Ted

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