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Puzzle 10/01/15 (C)

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Jan 15, 2010 7:27 pm    Post subject: Puzzle 10/01/15 (C) Reply with quote
Code:
 +-----------------------+
 | . . . | 9 . 4 | . . 7 |
 | . 4 . | . 2 . | 5 . 6 |
 | . . . | . . . | . 4 . |
 |-------+-------+-------|
 | 6 . . | 7 . 8 | . . . |
 | . 1 . | . . 5 | . 6 . |
 | 8 . . | 6 9 . | . 7 . |
 |-------+-------+-------|
 | . 6 . | . . . | 7 . . |
 | . . 4 | . 6 9 | . 3 5 |
 | 1 5 . | . . . | . 9 4 |
 +-----------------------+

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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sat Jan 16, 2010 12:31 am    Post subject: Reply with quote
One step:
Quote:
(7)r3c2=(7-8)r8c2=(8-9)r7c3=(9)r7c1-(9=7)r2c1-(7)r2c6=(7-2)r9c6=(2)r9c3-(2=7)r8c1
=> r23c1,r8c2<>7
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jan 17, 2010 6:01 am    Post subject: Reply with quote
I have no idea of what Dan's one-step move is, but I've used a half-dozen moves and am at a brick wall. A thick brick wall.

Code:

+--------------+------------+------------+
| 5   238  6   | 9  18  4   | 238 128 7  |
| 79  4    189 | 38 2   37  | 5   18  6  |
| 237 2378 18  | 5  178 6   | 23  4   9  |
+--------------+------------+------------+
| 6   9    23  | 7  4   8   | 1   5   23 |
| 4   1    7   | 2  3   5   | 9   6   8  |
| 8   23   5   | 6  9   1   | 4   7   23 |
+--------------+------------+------------+
| 239 6    89  | 4  5   23  | 7   28  1  |
| 27  278  4   | 1  6   9   | 28  3   5  |
| 1   5    23  | 38 78  237 | 6   9   4  |
+--------------+------------+------------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Jan 17, 2010 8:31 am    Post subject: Reply with quote
Marty R. wrote:
I have no idea of what Dan's one-step move is, but I've used a half-dozen moves and am at a brick wall. A thick brick wall.

Code:

+--------------+------------+------------+
| 5   238  6   | 9  18  4   | 238 128 7  |
| 79  4    189 | 38 2   37  | 5   18  6  |
| 237 2378 18  | 5  178 6   | 23  4   9  |
+--------------+------------+------------+
| 6   9    23  | 7  4   8   | 1   5   23 |
| 4   1    7   | 2  3   5   | 9   6   8  |
| 8   23   5   | 6  9   1   | 4   7   23 |
+--------------+------------+------------+
| 239 6    89  | 4  5   23  | 7   28  1  |
| 27  278  4   | 1  6   9   | 28  3   5  |
| 1   5    23  | 38 78  237 | 6   9   4  |
+--------------+------------+------------+

Play this puzzle online at the Daily Sudoku site


There is a 18 w-wing that will remove the 1 in r2c3 -- should get you going.
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Jan 17, 2010 11:42 am    Post subject: Reply with quote
Marty R. wrote:
I have no idea of what Dan's one-step move is, but I've used a half-dozen moves and am at a brick wall. A thick brick wall.

Code:

+--------------+------------+------------+
| 5   238  6   | 9  18  4   | 238 128 7  |
| 79  4    189 | 38 2   37  | 5   18  6  |
| 237 2378 18  | 5  178 6   | 23  4   9  |
+--------------+------------+------------+
| 6   9    23  | 7  4   8   | 1   5   23 |
| 4   1    7   | 2  3   5   | 9   6   8  |
| 8   23   5   | 6  9   1   | 4   7   23 |
+--------------+------------+------------+
| 239 6    89  | 4  5   23  | 7   28  1  |
| 27  278  4   | 1  6   9   | 28  3   5  |
| 1   5    23  | 38 78  237 | 6   9   4  |
+--------------+------------+------------+


No surprise. This is a very difficult puzzle.

I don't see Dan's W-Wing, but there's a <72> gM-Wing.

Code:
 also a single stepper for puzzle
 (7=2)r8c1 - r9c3 = (2-7)r9c6 = (7)r2c6  =>  r2c1<>7
 +--------------------------------------------------------------+
 |  5     238   6     |  9     18    4     |  238   128   7     |
 |  9-7   4     189   |  38    2    d37    |  5     18    6     |
 |  237   2378  18    |  5     178   6     |  239   4     19    |
 |--------------------+--------------------+--------------------|
 |  6     9     23    |  7     4     8     |  1     5     23    |
 |  4     1     7     |  2     3     5     |  89    6     89    |
 |  8     23    5     |  6     9     1     |  4     7     23    |
 |--------------------+--------------------+--------------------|
 |  239   6     89    |  4     5     23    |  7     128   18    |
 | a27    278   4     |  1     6     9     |  28    3     5     |
 |  1     5    b23    |  38    78   c237   |  6     9     4     |
 +--------------------------------------------------------------+
 # 46 eliminations remain


/16 (B) and /16 (C) are probably difficult as well.
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Jan 17, 2010 1:00 pm    Post subject: Reply with quote
daj95376 wrote:
I don't see Dan's W-Wing, but there's a <72> gM-Wing.

Code:
+---------------+------------+------------+
| 5   238   6   | 9  18  4   | 238 128 7  |
| 79  4     89-1| 38 2   37  | 5  *18  6  |
| 237 2378 *18  | 5  178 6   | 23  4   9  |
+---------------+------------+------------+
| 6   9     23  | 7  4   8   | 1   5   23 |
| 4   1     7   | 2  3   5   | 9   6   8  |
| 8   23    5   | 6  9   1   | 4   7   23 |
+---------------+------------+------------+
| 239 6    #89  | 4  5   23  | 7  #28  1  |
| 27  278   4   | 1  6   9   | 28  3   5  |
| 1   5     23  | 38 78  237 | 6   9   4  |
+---------------+------------+------------+
w-wing 18
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sun Jan 17, 2010 2:51 pm    Post subject: Reply with quote
arkietech wrote:
daj95376 wrote:
I don't see Dan's W-Wing, but there's a <72> gM-Wing.

Code:
+---------------+------------+------------+
| 5   238   6   | 9  18  4   | 238 128 7  |
| 79  4     89-1| 38 2   37  | 5  *18  6  |
| 237 2378 *18  | 5  178 6   | 23  4   9  |
+---------------+------------+------------+
| 6   9     23  | 7  4   8   | 1   5   23 |
| 4   1     7   | 2  3   5   | 9   6   8  |
| 8   23    5   | 6  9   1   | 4   7   23 |
+---------------+------------+------------+
| 239 6    #89  | 4  5   23  | 7  #28  1  |
| 27  278   4   | 1  6   9   | 28  3   5  |
| 1   5     23  | 38 78  237 | 6   9   4  |
+---------------+------------+------------+
w-wing 18

My mistake!!! There are six more eliminations in Marty's grid than the one I was using.
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sun Jan 17, 2010 3:12 pm    Post subject: Reply with quote
Another one stepper.

(3=2)r9c3 - (2=7)r8c1 - r2c1 = (7-3)r2c6 = (3)r2c4; r9c4<>3.

Ted
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jan 17, 2010 4:55 pm    Post subject: Reply with quote
Quote:
There is a 18 w-wing that will remove the 1 in r2c3 -- should get you going.

Easy to spot after I know there's one there. I hate to tell you how much time I spent in vain looking for a 18 W-Wing. Embarassed
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