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Set NNP Puzzle 29

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jan 26, 2009 11:27 pm    Post subject: Set NNP Puzzle 29 Reply with quote
Advanced.

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

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741
PostPosted: Tue Jan 27, 2009 10:10 am    Post subject: Reply with quote
Code:
.------------------.------------------.------------------.
| 278   79    89   | 1     27    6    | 3     4     5    |
| 357   6     35   | 3578  4     378  | 2     9     1    |
| 235   4     1    | 359   235   39   | 6     7     8    |
:------------------+------------------+------------------:
| 4     2     379  | 379   37    1    | 8     5     6    |
| 358   39    3589 | 4     6     389  | 1     2     7    |
| 6     1     78   | 578   57    2    | 9     3     4    |
:------------------+------------------+------------------:
| 37    8     2    | 37    1     5    | 4     6     9    |
| 1     37    4    | 6     9     37   | 5     8     2    |
| 9     5     6    | 2     8     4    | 7     1     3    |
'------------------'------------------'------------------'

w-wing {3,9}... (9=3)r3c6 - (3)r8c6 = (3)r8c2 - (3=9)r5c2; r5c6 <> 9
chain... (9)r5c2 = (9)r1c2 - (9=8)r1c3 - (8)r1c1 = (8)r5c1 - (8=3)r5c8; r5c2 <> 3
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Jan 27, 2009 4:11 pm    Post subject: Reply with quote
I solved this puzzle without chains, but with a pseudo-cell as a pincer for a w-wing (which could be viewed as a chain). My three steps were:
Quote:
coloring on <7>,
w-wing78 with pincer <78> at r2c6 and pseudo-cell pincer <79>-<98> at r1c23 and strong link <7> in row8
w-wing 39 with pincers at r3c6 & r5c2 and strong link <3> again in row8.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Jan 29, 2009 4:56 pm    Post subject: Reply with quote
I used two ERs (3&7), a Type 4 UR (35), an X-Wing (3) and an XY-Wing (583).
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