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Puzzle 11/08/12: ~ Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Fri Aug 12, 2011 6:17 pm    Post subject: Puzzle 11/08/12: ~ Advanced Reply with quote

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

Play this puzzle online at the Daily Sudoku site
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SudoQ



Joined: 02 Aug 2011
Posts: 127

PostPosted: Sun Aug 14, 2011 8:05 pm    Post subject: Reply with quote

It's a two stepper if you start with this:
Code:
r4c8=5 => r4c7=8 => r4c1<>8
r9c8=5 => r7c9=6 => r7c1=8 => r4c1<>8

Sorry about the syntax, I stil struggle with Eureka!
/SudoQ
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Aug 14, 2011 9:34 pm    Post subject: Reply with quote

SudoQ wrote:
Sorry about the syntax, I stil struggle with Eureka!

I was able to follow your logic. That's what's important.
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Marty R.



Joined: 12 Feb 2006
Posts: 5161
Location: Rochester, NY, USA

PostPosted: Mon Aug 15, 2011 12:22 am    Post subject: Reply with quote

W-Wing (68), flightless with transport of each pincer; r5c9<>8
M-Wing (56); r1c3<>6
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Marty R.



Joined: 12 Feb 2006
Posts: 5161
Location: Rochester, NY, USA

PostPosted: Mon Aug 15, 2011 12:38 am    Post subject: Reply with quote

I just threw this together quickly on Draw/Play.

Code:

+--------------+---------+-------------+
| 1   7   69   | 489 3 5 | 48  68  2   |
| 2   8   359  | 49  6 1 | 345 7   59  |
| 369 356 4    | 89  7 2 | 358 1   569 |
+--------------+---------+-------------+
| 368 36  7    | 1   2 9 | 358 358 4   |
| 4   2   38   | 6   5 7 | 1   9   38  |
| 5   9   1    | 3   8 4 | 6   2   7   |
+--------------+---------+-------------+
| 68  1   568  | 2   9 3 | 7   4   56  |
| 7   4   2    | 5   1 6 | 9   38  38  |
| 369 356 3569 | 7   4 8 | 2   56  1   |
+--------------+---------+-------------+

Play this puzzle online at the Daily Sudoku site

Quote:
r4c8=5 => r4c7=8 => r4c1<>8

Help me, I'm just not seeing how r4c8=5 leads to r4c7=8.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Aug 15, 2011 1:55 am    Post subject: Reply with quote

Marty R. wrote:
Help me, I'm just not seeing how r4c8=5 leads to r4c7=8.

You missed an elimination in r4c7.

Code:
 r8  b9  Naked  Pair                     <> 38   r7c9,r9c8
   c9    Naked  Pair                     <> 38   r237c9

   c7b3  Locked Candidate 1              <> 3    r4c7

 after basics
 +--------------------------------------------------------------+
 |  1     7     69    |  489   3     5     |  48    68    2     |
 |  2     8     359   |  49    6     1     |  345   7     59    |
 |  369   356   4     |  89    7     2     |  358   1     569   |
 |--------------------+--------------------+--------------------|
 |  368   36    7     |  1     2     9     |  58    358   4     |
 |  4     2     38    |  6     5     7     |  1     9     38    |
 |  5     9     1     |  3     8     4     |  6     2     7     |
 |--------------------+--------------------+--------------------|
 |  68    1     568   |  2     9     3     |  7     4     56    |
 |  7     4     2     |  5     1     6     |  9     38    38    |
 |  369   356   3569  |  7     4     8     |  2     56    1     |
 +--------------------------------------------------------------+
 # 42 eliminations remain

Another way to present SudoQ's logic:

Code:
if   r4c7<>8
then r4c7= 5
then r4c8<>5
then r9c8= 5
then r7c9<>5
then r7c9= 6
then r7c1<>6
then r7c1= 8  =>  r4c1<>8

As an AIC:

Code:
(8=5)r4c7 - (5)r4c8 = (5)r9c8 - (5=6)r7c9 - (6=8)r7c1  =>  r4c1<>8
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Marty R.



Joined: 12 Feb 2006
Posts: 5161
Location: Rochester, NY, USA

PostPosted: Mon Aug 15, 2011 3:46 am    Post subject: Reply with quote

Quote:
You missed an elimination in r4c7.

Thanks. Embarassed Embarassed Embarassed
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