dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Puzzle 11/07/15: ~ XY

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj
View previous topic :: View next topic  
Author Message
daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Fri Jul 15, 2011 5:45 pm    Post subject: Puzzle 11/07/15: ~ XY Reply with quote
Code:
 +-----------------------+
 | . 6 . | . . . | . . . |
 | 2 1 . | 8 . . | . . 5 |
 | . . . | 3 . . | . . 4 |
 |-------+-------+-------|
 | . 3 7 | 5 1 . | . 6 . |
 | . . . | 6 3 . | 5 . . |
 | . . . | . . 7 | . 1 . |
 |-------+-------+-------|
 | . . . | . 8 . | 7 9 . |
 | . . . | 9 . 5 | 8 4 2 |
 | . 9 8 | . . . | . 5 6 |
 +-----------------------+

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message
Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
PostPosted: Fri Jul 15, 2011 7:00 pm    Post subject: Reply with quote
MUG (256) =>r4c1, r6c9<>8
Code:
 *--------------------------------------------------*
 | 358  6    345  | 127  45   129  | 129  38   17   |
 | 2    1    34   | 8    47   69   | 69   37   5    |
 | 7    58   9    | 3    25   16   | 16   28   4    |
 |----------------+----------------+----------------|
 |-89   3    7    | 5    1    24   | 24   6    89   |
 | 19   4    12   | 6    3    8    | 5    27   79   |
 |*568 *258 *256  | 24   9    7    | 234  1   3-8   |
 |----------------+----------------+----------------|
 |*56  *25  *256  | 14   8    134  | 7    9    13   |
 | 13   7    13   | 9    6    5    | 8    4    2    |
 | 4    9    8    | 127  27   123  | 13   5    6    |
 *--------------------------------------------------*
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Jul 16, 2011 4:54 am    Post subject: Reply with quote
Looking at the potential 56 DP in boxes 47: either r67c3=2 or r6c1=8. Common outcome; r2c8=3.
Back to top
View user's profile Send private message
peterj



Joined: 26 Mar 2010
Posts: 974
Location: London, UK
PostPosted: Sat Jul 16, 2011 6:11 am    Post subject: Reply with quote
A short xy-chain...
Code:
xy-chain ; (3=7)r2c8 - (7=2)r5c8 - (2=1)r5c3 - (1=3)r9c3 ; r2c3<>3
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Jul 16, 2011 1:59 pm    Post subject: Reply with quote
AMUG(256)r67c123[(2)r5c3=(5)r67c3]-(5=34)r12c3-(3=1)r8c3-(1=2)r5c3; r5c3=2

Ted
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Jul 16, 2011 2:05 pm    Post subject: Reply with quote
Luke451 wrote:
MUG (256) =>r4c1, r6c9<>8
Code:
 *--------------------------------------------------*
 | 358  6    345  | 127  45   129  | 129  38   17   |
 | 2    1    34   | 8    47   69   | 69   37   5    |
 | 7    58   9    | 3    25   16   | 16   28   4    |
 |----------------+----------------+----------------|
 |-89   3    7    | 5    1    24   | 24   6    89   |
 | 19   4    12   | 6    3    8    | 5    27   79   |
 |*568 *258 *256  | 24   9    7    | 234  1   3-8   |
 |----------------+----------------+----------------|
 |*56  *25  *256  | 14   8    134  | 7    9    13   |
 | 13   7    13   | 9    6    5    | 8    4    2    |
 | 4    9    8    | 127  27   123  | 13   5    6    |
 *--------------------------------------------------*


Howdy Luke,

Have I messed up a AMUG again? I considered r67c3=5 as part of the SIS since they are not an explicit AMUG digit for those two cells.

Ted
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Jul 16, 2011 2:12 pm    Post subject: Reply with quote
peterj wrote:
A short xy-chain...
Code:
xy-chain ; (3=7)r2c8 - (7=2)r5c8 - (2=1)r5c3 - (1=3)r9c3 ; r2c3<>3


Peter, I think Keith would call your xy-chain a xy-wing with pseudocell (23)r58c3.

Ted
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills
PostPosted: Sat Jul 16, 2011 2:20 pm    Post subject: Reply with quote
As usual, I also look for reliable anp()s and found this one.......

anp(34=5)r21c3-(5=8)r3c2-(8=2)r3c8-r5c8=(2-1)r5c3=(1-3)r8c3; r8c3<>3=1

This path uses a bit of my original AMUG and also part of Peter's xy-chain.

Ted
Back to top
View user's profile Send private message
ronk



Joined: 07 May 2006
Posts: 398
PostPosted: Sat Jul 16, 2011 2:48 pm    Post subject: Reply with quote
tlanglet wrote:
Have I messed up a AMUG again? I considered r67c3=5 as part of the SIS since they are not an explicit AMUG digit for those two cells.

It looks like you've taken the BUG-Lite approach. For the MUG, digits <256> are allowed in all six cells.
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3854
PostPosted: Sat Jul 16, 2011 5:44 pm    Post subject: Reply with quote
Stumbled across this after reading Luke's solution and reviewing output from my solver.

Code:
 after basics
 +-----------------------------------------------------+
 |  358  6    345  |  127  45   129  |  129  38   17   |
 |  2    1    34   |  8    47   69   |  69   37   5    |
 |  7    58   9    |  3    25   16   |  16   28   4    |
 |-----------------+-----------------+-----------------|
 |  89   3    7    |  5    1    24   |  24   6    89   |
 |  19   4    12   |  6    3    8    |  5    27   79   |
 |  568  258  256  |  24   9    7    |  234  1    38   |
 |-----------------+-----------------+-----------------|
 |  56   25   256  |  14   8    134  |  7    9    13   |
 |  13   7    13   |  9    6    5    |  8    4    2    |
 |  4    9    8    |  127  27   123  |  13   5    6    |
 +-----------------------------------------------------+
 # 57 eliminations remain

<56> UR r67c13  =>  (5)r67c2 - (5)r3c2
Back to top
View user's profile Send private message
Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
PostPosted: Sun Jul 17, 2011 3:32 am    Post subject: Reply with quote
tlanglet wrote:
Luke451 wrote:
MUG (256) =>r4c1, r6c9<>8
Code:
 *--------------------------------------------------*
 | 358  6    345  | 127  45   129  | 129  38   17   |
 | 2    1    34   | 8    47   69   | 69   37   5    |
 | 7    58   9    | 3    25   16   | 16   28   4    |
 |----------------+----------------+----------------|
 |-89   3    7    | 5    1    24   | 24   6    89   |
 | 19   4    12   | 6    3    8    | 5    27   79   |
 |*568 *258 *256  | 24   9    7    | 234  1   3-8   |
 |----------------+----------------+----------------|
 |*56  *25  *256  | 14   8    134  | 7    9    13   |
 | 13   7    13   | 9    6    5    | 8    4    2    |
 | 4    9    8    | 127  27   123  | 13   5    6    |
 *--------------------------------------------------*


Howdy Luke,

Have I messed up a AMUG again? I considered r67c3=5 as part of the SIS since they are not an explicit AMUG digit for those two cells.

Ted

I’ve messed up many a MUG, but I don’t think you have here.

DPs are fascinating, and it’s interesting this one was seen by different players for its UR, BUG-Lite, or MUG possibilities.

I saw it as a MUG:
Code:
+------------------+
| .     .    .     |
| .     .    .     |     
| 56    25   256   |     
+------------------+
| 56    25   256   |     
| .     .    .     |     
| .     .    .     |     
+------------------+

…or a composite of overlapping URs:
Code:
+------------------+
| .     .    .     |
| .     .    .     |     
| 56    .    56    |     
+------------------+
| 56    .    56    |   
| .     .    .     |     
| .     .    .     |     
+------------------+
Code:
+------------------+
| .     .    .     |
| .     .    .     |     
| .     25   25    |     
+------------------+
| .     25   25    |     
| .     .    .     |     
| .     .    .     |     
+------------------+

Only the 8s prevent the MUG, so it was a quick and chainless kill.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Puzzles by daj All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group