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Free Press September 14, 2012

 
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keith



Joined: 19 Sep 2005
Posts: 3179
Location: near Detroit, Michigan, USA

PostPosted: Fri Sep 14, 2012 1:14 pm    Post subject: Free Press September 14, 2012 Reply with quote

Code:
Puzzle: FP091412
+-------+-------+-------+
| . . 5 | 3 . . | . . . |
| . . . | 2 . . | . 1 . |
| 7 8 . | . 6 . | . . 4 |
+-------+-------+-------+
| 4 . 3 | . . . | . 9 . |
| . . . | 9 . 1 | . . . |
| . 7 . | . . . | 8 . 2 |
+-------+-------+-------+
| 3 . 1 | . 5 . | . . 6 |
| . 5 . | . . 8 | . . . |
| . . . | . . 3 | 7 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

Keith
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Fri Sep 14, 2012 9:47 pm    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------*
 | 69    1     5     | 3     4789  479   | 269   267   789   |
 | 69    3     4     | 2     789   579   | 569   1     789   |
 | 7     8     2     | 1     6     59    | 359  c35    4     |
 |-------------------+-------------------+-------------------|
 | 4     26    3     | 8     27    267   | 15    9     15    |
 | 5     26    8     | 9    a234   1     | 346   3467  37    |
 | 1     7     9     | 5    a34   b46    | 8    c346   2     |
 |-------------------+-------------------+-------------------|
 | 3     4     1     | 7     5     29    | 29    8     6     |
 | 2     5     7     | 6     19    8     | 1349 c34    39    |
 | 8     9     6     | 4     1-2   3     | 7    c25    15    |
 *-----------------------------------------------------------*
 wing
(2=34)r46c5-(4=6)r6c6-(6=3452)r3689c8 => -2r9c5; stte

either r5c5 and r9c8 must be a 2 and form pinchers of a wing
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Sat Sep 15, 2012 12:24 am    Post subject: Reply with quote

Nice spot, Dan! Looks like an ALS-xz, doesn't it?
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Sat Sep 15, 2012 12:40 am    Post subject: Reply with quote

Luke451 wrote:
Nice spot, Dan! Looks like an ALS-xz, doesn't it?


Thanks,

I understand it better using ALS to build psuedo-cells to form an xy-wing type pattern.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sat Sep 15, 2012 1:04 am    Post subject: Reply with quote

Definitely not a VH puzzle!

Code:
 after basics
 +--------------------------------------------------------------+
 |  69    1     5     |  3     4789  479   |  269   267   789   |
 |  69    3     4     |  2     789   579   |  569   1     789   |
 |  7     8     2     |  1     6     59    |  359   35    4     |
 |--------------------+--------------------+--------------------|
 |  4     26    3     |  8     27    267   |  15    9     15    |
 |  5     26    8     |  9     234   1     |  346   3467  37    |
 |  1     7     9     |  5     34    46    |  8     346   2     |
 |--------------------+--------------------+--------------------|
 |  3     4     1     |  7     5     29    |  29    8     6     |
 |  2     5     7     |  6     19    8     |  1349  34    39    |
 |  8     9     6     |  4     12    3     |  7     25    15    |
 +--------------------------------------------------------------+
 # 55 eliminations remain

 r37     X-Wing                          <> 9    r12c6,r128c7

 +--------------------------------------------------------------+
 |  69    1     5     |  3     4789  47    |  26    267   789   |
 |  69    3     4     |  2     789   57    |  56    1     789   |
 |  7     8     2     |  1     6     59    |  359   35    4     |
 |--------------------+--------------------+--------------------|
 |  4     26    3     |  8     27    267   |  15    9     15    |
 |  5     26    8     |  9     234   1     |  346   3467  37    |
 |  1     7     9     |  5     34    46    |  8     346   2     |
 |--------------------+--------------------+--------------------|
 |  3     4     1     |  7     5     29    |  29    8     6     |
 |  2     5     7     |  6     19    8     |  134   34    39    |
 |  8     9     6     |  4     12    3     |  7     25    15    |
 +--------------------------------------------------------------+
 # 50 eliminations remain

 (7=5)r2c6 - (5=9)r3c6 - (9=2)r7c6 - (2=9)r7c7 - (9=3)r8c9 - (3=7)r5c9  =>  r2c9<>7

 -or-

 (7=5)r2c6 - (5=6)r2c7 - (26=7)r1c78  =>  r1c56,r2c9<>7
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Sat Sep 15, 2012 1:15 am    Post subject: Reply with quote

It seems that without a one-stepper these days, one goes down in ignominious defeat, and so it is with me. I hacked away and used five steps, ending with an XY-Chain. I suspect I could have found the chain without one or more of the previous steps.
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Sat Sep 15, 2012 6:33 am    Post subject: Free Press September 14, 2012 Reply with quote

Marty
I think, what is important is the logic leading to the solution. Therefore, we should not consider mult-step solutions invalid or defeats as we have come across many puzzles which cannot be solved in one step. Although one step solutions are more elegant.
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Sat Sep 15, 2012 10:45 am    Post subject: Reply with quote

daj95376 wrote:
Definitely not a VH puzzle!


The LA Times call this puzzle "Diabolical" -- It is. Very Happy
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