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Puzzle 11/06/19: ~ Advanced

 
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon Jun 20, 2011 2:46 am    Post subject: Puzzle 11/06/19: ~ Advanced Reply with quote

Basics are an initial grind.

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

Play this puzzle online at the Daily Sudoku site
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tlanglet



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

PostPosted: Tue Jun 21, 2011 2:51 am    Post subject: Reply with quote

A two step "Advanced" level solution............

Quote:
Type 4 UR(18)r45c18; r5c16<>8
xy-wing (19-8) vertex (19)r5c6 and pseudocell (98)r5c73; r4c1<>8

Ted
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Luke451



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

PostPosted: Tue Jun 21, 2011 6:20 am    Post subject: Reply with quote

Another angle

Code:
 *-----------------------------------------------------------*
 | 5     7     9     | 34    46    36    | 8     1     2     |
 | 28    3     268   | 1     7     2589  | 456   59    46    |
 | 4     268   1     |*589  *589   2589  | 356   359   7     |
 |-------------------+-------------------+-------------------|
 | 18    569   356   | 7     2     18    | 369   4     36    |
 | 1278  4     28    | 6     3     189   | 29    78    5     |
 | 278   69    36    |*589  *589   4     | 2369  78    1     |
 |-------------------+-------------------+-------------------|
 | 3     1     258   | 458   46    568   | 7     25    9     |
 | 9     58    7     | 2     1     358   | 345   6     34    |
 | 6     25    4     |*359  *59    7     | 1     235   8     |
 *-----------------------------------------------------------*

Quote:
Type 1 MUG, r9c4=(3)
8s: r8c6=r8c2-r3c2=r2c13 =>r2c6<>8
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peterj



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

PostPosted: Tue Jun 21, 2011 10:11 am    Post subject: Reply with quote

Another angle, a one-step MUG(?)...
Code:
 *-----------------------------------------------------------*
 | 5     7     9     | 34    46    36    | 8     1     2     |
 | 28    3     268   | 1     7     2589  | 456   59    46    |
 | 4     268   1     | 589   589   2589  | 356   359   7     |
 |-------------------+-------------------+-------------------|
 |*18    569   356   | 7     2    *18    | 369   4     36    |
 |*178+2 4     8-2   | 6     3    *18+9  | (29) *78    5     |
 |*78+2  69    36    | 589   589   4     | 2369 *78    1     |
 |-------------------+-------------------+-------------------|
 | 3     1     258   | 458   46    568   | 7     25    9     |
 | 9     58    7     | 2     1     358   | 345   6     34    |
 | 6     25    4     | 359   59    7     | 1     235   8     |
 *-----------------------------------------------------------*
Overlapping UR(18) and UR(78)...
Code:
MUG(178)[(2)r56c1=(9)r5c6] - (9=2)r5c7 ; r5c3<>2
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Luke451



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

PostPosted: Tue Jun 21, 2011 1:38 pm    Post subject: Reply with quote

peterj wrote:
Another angle, a one-step MUG(?)...
Code:
 *-----------------------------------------------------------*
 | 5     7     9     | 34    46    36    | 8     1     2     |
 | 28    3     268   | 1     7     2589  | 456   59    46    |
 | 4     268   1     | 589   589   2589  | 356   359   7     |
 |-------------------+-------------------+-------------------|
 |*18    569   356   | 7     2    *18    | 369   4     36    |
 |*178+2 4     8-2   | 6     3    *18+9  | (29) *78    5     |
 |*78+2  69    36    | 589   589   4     | 2369 *78    1     |
 |-------------------+-------------------+-------------------|
 | 3     1     258   | 458   46    568   | 7     25    9     |
 | 9     58    7     | 2     1     358   | 345   6     34    |
 | 6     25    4     | 359   59    7     | 1     235   8     |
 *-----------------------------------------------------------*
Overlapping UR(18) and UR(78)...
Code:
MUG(178)[(2)r56c1=(9)r5c6] - (9=2)r5c7 ; r5c3<>2


The overlapping of URs has come up before, notably here in DonM's fun old "Suggest A Move" series.
Strmckr called it a MUG and it solved the puzzle in one move.

While at the time there was no one that stood up to gainsay the MUG claim. However, according to my personal notes, someone has pointed out it was not a MUG, but did not question the validity of the move.

Edit: unreferenced quote removed


Last edited by Luke451 on Tue Jun 21, 2011 4:44 pm; edited 1 time in total
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peterj



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

PostPosted: Tue Jun 21, 2011 2:05 pm    Post subject: Reply with quote

Luke, I put a "?" because I am always on uncertain ground when it comes to MUGs Exclamation
My precedent for calling it a MUG would be myth jellies post here .
Clearly it could be written as a chain of URs...
Code:
ur(78)[(2)r56c1=(1)r5c1] - ur(18)[(27)r5c1=(9)r5c6] - (9=2)r5c7
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Luke451



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

PostPosted: Tue Jun 21, 2011 3:14 pm    Post subject: Reply with quote

peterj wrote:
Luke, I put a "?" because I am always on uncertain ground when it comes to MUGs Exclamation

My offering was in response to the "?" not the move. Love the move, wish I'd spotted it myself.

"The Ultimate MUG Guide" has yet to be written, which explains my ongoing interest in all things muggy.
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Marty R.



Joined: 12 Feb 2006
Posts: 5061
Location: Rochester, NY, USA

PostPosted: Wed Jun 22, 2011 12:41 am    Post subject: Reply with quote

I used a Type 4 UR (78); r56c1<>8 which exposed an XY-Wing (278); r5c8<>8.
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