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Puzzle 11/02/28 Difficult

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Feb 28, 2011 10:56 pm    Post subject: Puzzle 11/02/28 Difficult Reply with quote
Code:
 +-----------------------+
 | 3 7 9 | . . . | . 6 . |
 | 8 . . | 7 9 2 | 1 3 . |
 | 2 . 1 | . 5 3 | 8 9 7 |
 |-------+-------+-------|
 | . 2 . | 9 . . | . 7 . |
 | . 3 4 | . 8 . | . . . |
 | . 9 7 | . . 5 | . . . |
 |-------+-------+-------|
 | . 5 6 | . . . | 9 . . |
 | 9 8 3 | 5 . . | . 2 . |
 | . . 2 | . . . | . . 8 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Tue Mar 01, 2011 2:11 am    Post subject: Reply with quote
A lucky find...........

Code:
 *--------------------------------------------------------------------*
 | 3      7      9      | 148   #14    #148    | 25     6      25     |
 | 8      6      5      | 7      9      2      | 1      3      4      |
 | 2      4      1      | 6      5      3      | 8      9      7      |
 |----------------------+----------------------+----------------------|
 | 156    2      8      | 9      1346   146    | 34     7      156    |
 | 156    3      4      | 12     8      7      | 256    15     9      |
 | 16     9      7      | 124    12346  5      | 34     8      126    |
 |----------------------+----------------------+----------------------|
 | 47     5      6      | 128    127    18     | 9      14     3      |
 | 9      8      3      | 5     #1467  #146    | 67     2      16     |
 | 47     1      2      | 3      67     9      | 567    45     8      |
 *--------------------------------------------------------------------*


Notice the AUR(14)r18c56 marked #
sis: for row 1, use the extra internal digit r1c6=8 and for row 8 use the external digit r8c9=1; r7c8,r8c56<>1
(1=8)r7c6-AUR(14)r18c56[(8)r1c6=(1)r8c9]

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Mar 01, 2011 5:41 am    Post subject: Reply with quote
I used the same potential 14 DP. Either r1c6=8 or r8c56=67 pseudo cell. Common outcome is r7c8, r8c9, r9c8=415.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Tue Mar 01, 2011 9:00 am    Post subject: Reply with quote
Alternatively, making the same eliminations as Ted without the AUR...
Code:
anp(18=2)r7c46 - r5c4=(2-6)r5c7=r89c7 - (6=1)r8c9 ; r7c8<>1, r8c56<>1
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