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Set N Puzzle 8 -- VH

dailysudoku.com Forum Index -> Puzzles by daj

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daj95376

Joined: 23 Aug 2008
Posts: 3854

Posted: Thu Jan 29, 2009 6:57 pm Post subject: Set N Puzzle 8 -- VH

Code:

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

Play this puzzle online at the Daily Sudoku site

===== ===== ===== ===== ===== ===== ===== ===== ===== Ratings

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, UR Type 1, X-Wing, XY-Wing, XYZ-Wing

VH+: 2-String Kite, Empty Rectangle, Remote Pair, Skyscraper, Colors, UR Type 2

Advanced: finned/Sashimi X-Wing, Multiple Colors, Swordfish, M-Wing, W-Wing, XY-Chain

Extreme: Jellyfish, (but mostly) Chain

storm_norm

Joined: 18 Oct 2007
Posts: 1741

Posted: Fri Jan 30, 2009 7:08 am Post subject:

Code:

.------------------------.------------------------.------------------------.
| 9 347 247 | 45 6 8 | 245 1 37 |
| 5 1 47 | 9 2 3 | 8 47 6 |
| 28 348 6 | 45 1 7 | 2459 245 39 |
:------------------------+------------------------+------------------------:
| 18 6 18 | 3 4 5 | 7 9 2 |
| 7 5 3 | 1 9 2 | 6 8 4 |
| 4 2 9 | 8 7 6 | 1 3 5 |
:------------------------+------------------------+------------------------:
| 6 9 157 | 2 8 4 | 3 57 17 |
| 3 48 248 | 7 5 1 | 249 6 89 |
| 128 478 124578 | 6 3 9 | 245 2457 178 |
'------------------------'------------------------'------------------------'

I did not see a xyz-wing and therefore this route is longer than necessary.
x-wing 2
xy-wing {4,5,7}
chain...(4=7)r2c3 - (7)r2c8 = (7-3)r9c1 = (3)r1c2; r1c2 <> 4
m-wing{4,5}... (4=5)r9c7 - (5)r1c7 = (5-4)r1c4 = (4)r1c3; r9c3 <> 4
extend that same m-wing...
(4=5)r9c7 - (5)r1c7 = (5-4)r1c4 = (4)r1c3 - (4=7)r2c3 - (7)r79c3 = (7)r9c2; r9c2 <> 4
xy-wing {2,4,5}

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