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NoName Puzzle 4

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Jan 27, 2009 4:02 pm    Post subject: NoName Puzzle 4 Reply with quote
This puzzle is from my Salsa file, but it doesn't meet the difficulty level desired.

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

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
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Wed Jan 28, 2009 12:48 am    Post subject: Reply with quote
Code:
.---------------.---------------.---------------.
|1[5]  3    6   |1[5]  9    4   | 8    27   27  |
| 145  45   2   | 7  [56]   8   | 9    3    16  |
| 7    9    8   | 3    2    16  | 5    4    16  |
:---------------+---------------+---------------:
| 68   1    57  | 4   -678  9   | 3    267  257 |
| 3    2    9   |5[6]  1    567 | 4    67   8   |
| 468  48   57  | 2   -68   3   | 1    9    57  |
:---------------+---------------+---------------:
|[5]8  6    1   | 9    3    2   | 7  [5]8   4   |
| 9    578  4   |5[68] 567  567 | 2    1    3   |
| 2    578  3   |15[8] 4    157 | 6  [58]   9   |
'---------------'---------------'---------------'

maybe its nicer to visualize if I bracket the digits used in the chain.
(6=5)r2c5 - (5)r1c4 = (5)r1c1 - (5)r7c1 = (5)r7c8 - (5=8)r9c8 - (8)r9c4 = (8-6)r8c4 = (6)r5c4; r46c5 <> 6
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