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Set NNP Puzzle 98

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Tue Jan 20, 2009 10:26 am Post subject: Set NNP Puzzle 98

Code:

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

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== ===== =====

Can be solved using steps from ...

Basics: Naked/Hidden Single, Naked Pair/Triple, Locked Candidate 1/2

Basics+: Naked Quad, Hidden Pair/Triple/Quad

VH: BUG+1, Remote Pair, UR Type 1, X-Wing, XY-Wing

Advanced: 2-String Kite, Empty Rectangle, Skyscraper, UR Type 2, XYZ-Wing

Extreme: finned X-Wing, Multiple Colors, M-Wing, W-Wing, XY-Chain

VH+AE: multi-step VH plus one Advanced and one Extreme step.

Extreme+: Swordfish, Jellyfish, (but mostly) Chain

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Tue Jan 20, 2009 7:39 pm Post subject:

Code:

.---------------------.---------------------.---------------------.
| 6 1 9 | 23 7 235 | 24 245 8 |
| 578 2 W78 | 4 9 5-6 |W67 3 1 |
| 57 4 3 | 26 1 8 | 267 2567 9 |
:---------------------+---------------------+---------------------:
| 178 9 W78 | 5 3 W67 | 12467 12467 2467 |
| 17 6 2 | 8 4 9 | 5 17 3 |
| 3 5 4 | 67 2 1 | 9 8 67 |
:---------------------+---------------------+---------------------:
| 9 7 156 | 12 8 4 | 3 126 256 |
| 2 8 15 | 137 6 37 | 147 9 457 |
| 4 3 16 | 9 5 27 | 8 1267 267 |
'---------------------'---------------------'---------------------'

w-wing on the marked {6,7} removes 6 from r2c6
leaves a UR type 1 on {7,8} r24c13 places 1 in r4c1

tlanglet

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

Posted: Wed Jan 21, 2009 3:05 pm Post subject:

Norm,

I had a similar solution, but in reverse order. The UR78 in r24c13 has an x-wing on <8> overlay that deletes <7> from r24c1 giving the code:

Code:

*--------------------------------------------------------------------*
| 6 1 9 | 23 7 235 | 24 245 8 |
| 58 2 T78 | 4 9 56 | W67 3 1 |
| 57 4 3 | 26 1 8 | 267 2567 9 |
|----------------------+----------------------+----------------------|
| 18 9 T78 | 5 3 6-7 | 12467 12467 2467 |
| 17 6 2 | 8 4 9 | 5 17 3 |
| 3 5 4 | W67 2 1 | 9 8 67 |
|----------------------+----------------------+----------------------|
| 9 7 156 | 12 8 4 | 3 126 256 |
| 2 8 15 | 137 6 37 | 147 9 457 |
| 4 3 16 | 9 5 27 | 8 1267 267 |
*--------------------------------------------------------------------*

Then I used a useless w-wing <67> as marked with strong link <6> in box <2> to transport <7> in pincer r2c7 to r4c3 thereby deleting <7> from r4c6.

Ted

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