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Set J Puzzle 16 -- VH+

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sun Feb 01, 2009 10:27 am    Post subject: Set J Puzzle 16 -- VH+ Reply with quote

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

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 X-Wing, Multiple Colors, Swordfish, M-Wing, W-Wing, XY-Chain

Extreme: Jellyfish, (but mostly) Chain
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tlanglet



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

PostPosted: Sun Feb 01, 2009 9:22 pm    Post subject: Reply with quote

Here is my code after basics.
Code:

 *-----------------------------------------------------------*
 | 6     5     2     | 1     4     9     | 38    378   378   |
 | 4     8     37    | 357   367   2     | 56    9     1     |
 | 1     37    9     | 3578  3678  57    | 256   25    4     |
 |-------------------+-------------------+-------------------|
 | 357   347   45    | 9     278   6     | 238   1     2378  |
 | 9     6     378   | 278   5     1     | 4     2378  2378  |
 | 2     1     78    | 4     78    3     | 9     6     5     |
 |-------------------+-------------------+-------------------|
 | 357   347   45    | 2357  9     8     | 1     235   6     |
 | 3578  9     1     | 6     237   57    | 2358  4     238   |
 | 358   2     6     | 35    1     4     | 7     358   9     |
 *-----------------------------------------------------------*

I wandered around for seven (Yes, I do mean 7) steps to finish this the first time, but I am going to try for something shorter (one day).
Quote:
Multi-coloring <2>,
ER <5> then ER <7>,
xy-wing <357> or a w-wing <37> provide the identical resultant deletions,
xy-wing <678>,
xyz-wing <357>,
and another ER <7>

I do enjoy these types of puzzles..........

Ted
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Mon Feb 02, 2009 1:50 am    Post subject: Reply with quote

Code:
.------------------.------------------.------------------.
| 6     5     2    | 1     4     9    | 38    378   378  |
| 4     8     37   | 357   367   2    |*56    9     1    |
| 1     37    9    | 3578  3678 *57   |*256  *25    4    |
:------------------+------------------+------------------:
| 357   347   45   | 9     278   6    | 238   1     2378 |
| 9     6     378  | 278   5     1    | 4     2378  2378 |
| 2     1     78   | 4     78    3    | 9     6     5    |
:------------------+------------------+------------------:
| 357   347   45   | 2357  9     8    | 1     235   6    |
| 3578  9     1    | 6     237  *57   |23-58  4     238  |
| 358   2     6    | 35    1     4    | 7     358   9    |
'------------------'------------------'------------------'

the ER 5 removes 5 from r8c7

Code:
.------------------.------------------.------------------.
| 6     5     2    | 1     4     9    | 38    378   378  |
| 4     8    W37   |*357   367   2    | 56    9     1    |
| 1    W37    9    |*3578 36-78 5-7   | 56    2     4    |
:------------------+------------------+------------------:
| 357   347   45   | 9     2     6    | 38    1     378  |
| 9     6    W378  |*78    5     1    | 4    W37    2    |
| 2     1     78   | 4     78    3    | 9     6     5    |
:------------------+------------------+------------------:
| 357   347   45   | 2     9     8    | 1     35    6    |
| 358   9     1    | 6     37    57   | 2     4     38   |
| 358   2     6    | 35    1     4    | 7     358   9    |
'------------------'------------------'------------------'

this extended w-wing with group ending finishes it.
(7=3)r3c2 - (3)r2c3 = (3)r5c3 - (3=7)r5c8 - (7)r5c4 = (7)r23c4; r3c56 <> 7
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