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Puzzle 10/06/14: (C) XY

 
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jun 14, 2010 5:48 pm    Post subject: Puzzle 10/06/14: (C) XY Reply with quote
Code:
 +-----------------------+
 | 2 . . | . 8 9 | . . 1 |
 | . 6 . | 3 . 1 | . . 2 |
 | . . 8 | 6 2 . | . . . |
 |-------+-------+-------|
 | . 7 1 | 5 9 2 | . 3 8 |
 | 9 . 3 | 8 7 . | 1 . . |
 | 8 5 . | 1 . . | . . . |
 |-------+-------+-------|
 | . . . | . 3 . | . . . |
 | . . . | 2 . . | . 9 . |
 | 3 1 . | 9 . . | . . 6 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site

Code:
 after basics ... not much left
 +-----------------------------------------------------+
 |  2    3    5    |  4    8    9    |  6    7    1    |
 |  47   6    79   |  3    5    1    |  89   48   2    |
 |  1    49   8    |  6    2    7    |  35   45   39   |
 |-----------------+-----------------+-----------------|
 |  6    7    1    |  5    9    2    |  4    3    8    |
 |  9    2    3    |  8    7    4    |  1    6    5    |
 |  8    5    4    |  1    6    3    |  79   2    79   |
 |-----------------+-----------------+-----------------|
 |  5    89   269  |  7    3    68   |  28   1    4    |
 |  47   48   67   |  2    1    568  |  35   9    37   |
 |  3    1    27   |  9    4    58   |  27   58   6    |
 +-----------------------------------------------------+
 # 26 eliminations remain
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jun 14, 2010 6:45 pm    Post subject: Reply with quote
I haven't looked at this but is it straying into classic MUG/BUG territory by any chance ?
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Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Mon Jun 14, 2010 7:04 pm    Post subject: Reply with quote
Quote:
There's an xy-chain, pincers at r2c3 and r9c7 that removes 7 at r9c3 and solves it but I'm guessing that is not what you are after.......
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Mon Jun 14, 2010 8:21 pm    Post subject: Reply with quote
Danny, I have to do a colouring move or skyscraper to get to your 'after basics' - have I missed something? (At least using SS for basics Smile )
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Mon Jun 14, 2010 8:50 pm    Post subject: Reply with quote
Using Danny's "After basics", I found this chain pursuing an xy-wing.

Quote:
(4=8)r2c8 - r2c7 = r7c7 - r7c2 = (8-4)r8c2 = r8c1 - r2c1 = (4)r3c2; r3c8<>4

Ted
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Mon Jun 14, 2010 9:49 pm    Post subject: Reply with quote
peterj wrote:
Danny, I have to do a colouring move or skyscraper to get to your 'after basics' - have I missed something? (At least using SS for basics Smile )

My mistake. I used a PM for the final step instead of the PM before the Turbot step(s). So, go with whatever you have for a solution.
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peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Tue Jun 15, 2010 6:48 am    Post subject: Reply with quote
So from the original grid I had two moves ending in one of many possible xy-chains..
Quote:
skyscraper(4); r3c9<>4, r9c8<>4
xy-chain (7=4)r2c1-(4=9)r3c2-(9=3)r3c9-(3=7)r8c9; r8c1<>7
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daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Tue Jun 15, 2010 2:10 pm    Post subject: Reply with quote
peterj wrote:
So from the original grid I had two moves ending in one of many possible xy-chains..
Quote:
skyscraper(4); r3c9<>4, r9c8<>4
xy-chain (7=4)r2c1-(4=9)r3c2-(9=3)r3c9-(3=7)r8c9; r8c1<>7

You could also have chosen an ending M/W-Wings.

Code:
rcc_-r_-c (7=9)r2c3 - r2c7 = (9-7)r6c7 = (7)r9c7  =>  r9c3<>7
rcr_--_-- (9=8)r7c2 - r7c7 = (8-9)r2c7 = (9)r2c3  =>  r3c2,r7c3<>9
rcb_-r_-c (9=8)r7c2 - r7c7 = (8-9)r2c7 = (9)r3c9  =>  r3c2<>9

W-Wing (9=7)r2c3 - r9c3 = r9c7 - (7=9)r6c7  =>  r2c7<>9
W-Wing (8=9)r2c7 - r2c3 = r3c2 - (9=8)r7c2  =>  r7c7<>8
W-Wing (8=9)r2c7 - r2c3 = r7c3 - (9=8)r7c2  =>  r7c7<>8
W-Wing (8=9)r2c7 - r3c9 = r3c2 - (9=8)r7c2  =>  r7c7<>8
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Jun 16, 2010 1:36 am    Post subject: Reply with quote
XY-Wing (475)
Remote Pairs (47)
XYZ-Wing (457)
W-Wing (89)
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