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MM 1351 march 22

 
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sun Mar 22, 2009 5:00 pm    Post subject: MM 1351 march 22 Reply with quote

Code:

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

Play this puzzle online at the Daily Sudoku site
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Sun Mar 22, 2009 6:04 pm    Post subject: Reply with quote

Interesting! My final PM resembles a BUG+2, but I can't get it to work as a BUG+2 in my head.

Code:
 +-----------------------------------------------------+
 |  2    8    49   |  6    45   7    |  159  3    15   |
 |  1    6    5    |  3    9    2    |  4    7    8    |
 |  7    34   39   |  45   1    8    |  2    69   569  |
 |-----------------+-----------------+-----------------|
 |  8    49   7    |  45   56   3    |  69   1    2    |
 |  5    39   23   |  7    26   1    |  8    69   4    |
 |  6    1    24   |  8    24   9    |  7    5    3    |
 |-----------------+-----------------+-----------------|
 |  3    5    8    |  9    7    4    |  16   2    16   |
 |  9    2    6    |  1    8    5    |  3    4    7    |
 |  4    7    1    |  2    3    6    |  59   8    59   |
 +-----------------------------------------------------+
 # 25 eliminations remain


Last edited by daj95376 on Sun Mar 22, 2009 11:15 pm; edited 1 time in total
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keith



Joined: 19 Sep 2005
Posts: 3344
Location: near Detroit, Michigan, USA

PostPosted: Sun Mar 22, 2009 8:36 pm    Post subject: Reply with quote

Norm,

Are you trying to make me happy?

Edit: After an X-wing 4, an XY-wing -239 and an XYZ-wing 56-9

I get to here:


Code:
+-------------+-------------+-------------+
| 2   8   49  | 6   45  7   | 159 3   15  |
| 1   6   5   | 3   9   2   | 4   7   8   |
| 7   349 39  | 45  1   8   | 2   69  569 |
+-------------+-------------+-------------+
| 8   49  7   | 45  56  3   | 69  1   2   |
| 5   39  239 | 7   26  1   | 8   69  4   |
| 6   1   24  | 8   24  9   | 7   5   3   |
+-------------+-------------+-------------+
| 3   5   8   | 9   7   4   | 16  2   16  |
| 9   2   6   | 1   8   5   | 3   4   7   |
| 4   7   1   | 2   3   6   | 59  8   59  |
+-------------+-------------+-------------+

There is a hidden UR <39> in R35C23. R3C3 and R5C2 must be <3>. This opens up a skyscraper which takes out <9> in R1C7. The puzzle is toast!

Edit: Deleted incorrect comment on the BUG+2.

Keith
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keith



Joined: 19 Sep 2005
Posts: 3344
Location: near Detroit, Michigan, USA

PostPosted: Mon Mar 23, 2009 1:09 am    Post subject: Reply with quote

daj95376 wrote:
Interesting! My final PM resembles a BUG+2, but I can't get it to work as a BUG+2 in my head.

Code:
 +-----------------------------------------------------+
 |  2    8    49   |  6    45   7    |  159  3    15   |
 |  1    6    5    |  3    9    2    |  4    7    8    |
 |  7    34   39   |  45   1    8    |  2    69   569  |
 |-----------------+-----------------+-----------------|
 |  8    49   7    |  45   56   3    |  69   1    2    |
 |  5    39   23   |  7    26   1    |  8    69   4    |
 |  6    1    24   |  8    24   9    |  7    5    3    |
 |-----------------+-----------------+-----------------|
 |  3    5    8    |  9    7    4    |  16   2    16   |
 |  9    2    6    |  1    8    5    |  3    4    7    |
 |  4    7    1    |  2    3    6    |  59   8    59   |
 +-----------------------------------------------------+
 # 25 eliminations remain

Danny,

The Deadly Pattern is such that every unsolved cell has two candidates, and that each candidate exists exactly twice in each row, column and box.

I cannot see a potential DP here.

Keith
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sun Mar 29, 2009 4:38 am    Post subject: Reply with quote

Quote:
There is a hidden UR <39> in R35C23. R3C3 and R5C2 must be <3>.

Keith, there's nothing hidden, it's a full Type 6. I actually used seven ordinary moves, with the Type 6 and coloring on 9 as the last two. That last coloring takes out the same 9 as your skyscraper. I probably had the skyscraper and didn't notice it.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sun Mar 29, 2009 8:15 pm    Post subject: Reply with quote

I'm strangely stuck here. I used the x-wings on 4, an xy wing on 249 and and ER on 9 and have actually gone further than Keith's grid - in R3C2 I just have a 34 and in R5C3 a 23. As such I can't see any UR.

BUT I still have a 159 in R1C9. How did the 9 get removed?
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Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Sun Mar 29, 2009 8:45 pm    Post subject: Reply with quote

Keith referred to an XYZ-wing 56-9.

I suspect this is pivoted on r3c9 and does the trick.

Steve
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Sun Mar 29, 2009 8:58 pm    Post subject: Reply with quote

Quote:
Keith referred to an XYZ-wing 56-9.
I suspect this is pivoted on r3c9 and does the trick.
Steve


Yes, quite! Thank you. Though still don't see last move - the colouring doesn't seem to work.
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