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Puzzle 11/04/26: ~ Difficult+

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Wed Apr 27, 2011 5:58 am    Post subject: Puzzle 11/04/26: ~ Difficult+ Reply with quote

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

Play this puzzle online at the Daily Sudoku site



After Basics: This doesn't crack the puzzle, but it's a little productive.

Code:
 UR[(3=9)r7c79] - (9=5)r7c4 - (5=8)r9c4 - (8=1)r9c8 - (1=3)r9c5  =>  r7c5,r9c7<>3
 +--------------------------------------------------------------+
 |  9     1     5     |  7     4     3     |  68    2     68    |
 |  3     6     7     |  2     5     8     |  1     9     4     |
 |  2     4     8     |  1     9     6     | *57    3    *57    |
 |--------------------+--------------------+--------------------|
 |  148   7     14    |  3     128   12    |  69    5     69    |
 |  5     2     6     |  4     18    9     |  38    7     138   |
 |  18    3     9     |  6     7     5     |  2     4     18    |
 |--------------------+--------------------+--------------------|
 |  147   8     1234  |  59    12-3  1247  | *57+39 6    *57+39 |
 |  17    5     123   |  89    6     127   |  4     18    379   |
 |  6     9     134   |  58    13    147   |  57-3  18    2     |
 +--------------------------------------------------------------+
 # 53 eliminations remain
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tlanglet



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

PostPosted: Thu Apr 28, 2011 1:48 am    Post subject: Reply with quote

I found several steps that had limited impact including the AUR noted by Danny, but then I hit a winner; long but it did the dirty deed...........

anp(17=4)r78c1-als(4=13)r9c35-(1=8)r9c8-(8=5)r9c4-(5=9)r7c4-r7c79=r8c9-(9=6=8=1)r416c9; r6c1<>1

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Thu Apr 28, 2011 3:26 am    Post subject: Reply with quote

Whew !!! My head hurts just from trying to follow it. _ Very Happy _
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK

PostPosted: Thu Apr 28, 2011 6:57 am    Post subject: Reply with quote

I went down a long twisty route with this one. Looked like lots of DPs in the grid to me and eventually I found this one-stepper...
Code:
BUG-Lite(68-69-38-39)r1457c79 ; r5c9<>3
(1)r5c9
||
(3)r8c9
||
(3)r9c7 - (3=1)r9c5 - (1=8)r5c5 - (8=3)r5c7
||
(9)r8c9 - (3)r8c9=(3-2)r8c3=r8c6 - (2=1)r4c6 - (1=8)r5c5 - (8=3)r5c7
Then I realised I was being thick! As the second and fourth streams are conjugates this m-wing-like AIC does the same job...
Code:
(3=8)r5c6-(8=1)r5c5-(1=2)r4c6 - r8c6=(2-3)r8c3=r8c9 ; r5c9<>3
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