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Puzzle 11/05/08: A Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon May 09, 2011 3:17 am    Post subject: Puzzle 11/05/08: A Advanced Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Mon May 09, 2011 4:12 am    Post subject: Reply with quote

Quote:
Type 2 UR(19)r36c89; r5c7,r6c3<>7

Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Mon May 09, 2011 4:31 am    Post subject: Reply with quote

Another one step solution.........

Quote:
Type 1 BUG-Lite (349)r12c147; R2c7<>34=78
Ted
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tlanglet



Joined: 17 Oct 2007
Posts: 2461
Location: Northern California Foothills

PostPosted: Mon May 09, 2011 4:33 am    Post subject: Reply with quote

Would you believe another AUR type one step solution....

Quote:
AUR(48)r24c79 external sis r1c7=4,r2c8=8,r5c7=8; r2c9,r4c7<>4
(4)r1c7;
||
(8)r2c8-(7)r2c8=r2c7-(7=8)r5c7-(8=4)r4c9
||
(8)r5c7-(8=4)r4c9;

Ted

[daj Edit: corrected (apparent) typos.]
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Marty R.



Joined: 12 Feb 2006
Posts: 5119
Location: Rochester, NY, USA

PostPosted: Tue May 10, 2011 12:55 am    Post subject: Reply with quote

I used the DP 49-39-34 in boxes 123, which had a pseudo cell of 78 to combine with a like pair in both the box and column.

I noticed the Type 2 UR but just eyeballing it I thought the DP would be more productive, although I was wrong based on Ted's findings.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Tue May 10, 2011 7:20 am    Post subject: Reply with quote

Add a couple of obscure M-Wings as ways to crack this puzzle.

Code:
 +------------------------------------------------------------------------+
 |  49     6      1      |  39     7      8      |  34      2      5      |
 |  49     5      2      |  39     1      6      | b3478   c78     348    |
 |  7      3      8      |  4      2      5      |  6       19     19     |
 |-----------------------+-----------------------+------------------------|
 |  18     189    5      |  2      6      7      |  489     3      48     |
 |  3      78     4      |  5      9      1      | a78      6      2      |
 |  6      2      79     |  8      4      3      |  5      b179    179    |
 |-----------------------+-----------------------+------------------------|
 |  18     1489   6      |  7      5      249    |  1239-8 d89     38     |
 |  5      789    79     |  1      3      29     |  279-8   4      6      |
 |  2      1479   3      |  6      8      49     |  179     5      79     |
 +------------------------------------------------------------------------+
 # 52 eliminations remain

 M-Wing 7A (8=7)r5c7 - r6c8 = (7-8)r2c8 = (8)r7c8  =>  r78c7<>8
 M-Wing 7B (8=7)r5c7 - r2c7 = (7-8)r2c8 = (8)r7c8  =>  r78c7<>8
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