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 11/05/28: ~ 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: 3855

PostPosted: Sat May 28, 2011 5:55 pm    Post subject: Puzzle 11/05/28: ~ XY Reply with quote

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

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



Joined: 13 Jun 2010
Posts: 371
Location: Charleroi, Belgium

PostPosted: Sun May 29, 2011 8:11 am    Post subject: Reply with quote

Just to relax after the high flying discussions on the Eureka Forum Rolling Eyes ...
Quote:
If r2c4=9 Then r3c6=8, r37c45=37. Therefore r2c4=3.
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Mon May 30, 2011 4:48 am    Post subject: Reply with quote

Hidden UR (35); r5c3<>3
XY-Wing (135); r4c3, r5c7<>5
DP (37), boxes 28; all possibilities solve box 8 the same
Back to top
View user's profile Send private message
peterj



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

PostPosted: Mon May 30, 2011 7:49 am    Post subject: Reply with quote

JC (and Marty) nice UR move! An example of where mixing internal and external SIS can make it very clear...
Code:
ur(37)r37c45[(9)r7c4=(3)r2c4] ; r2c4<>9

I found an m-wing-like move..
Code:
m-wing-like(69) ; (6=1)r1c6=(1=9)r1c8 - r6c8=(9-6)r6c7=r6c5 ; r2c5<>6, r5c6<>6
Back to top
View user's profile Send private message
daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Mon May 30, 2011 3:26 pm    Post subject: Reply with quote

My solver also found r2c4<>9. However, I decided to see if I could find something my solver couldn't find.

Code:
 <29> DP r7c69,r8c29,r9c26

 (3)r7c9             - (3)r9c7
 (8)r9c6 - (8=3)r9c5 - (3)r9c7
 +--------------------------------------------------------------+
 |  8     3     69    |  2     4     16    |  7     19    5     |
 |  4     7     269   |  39    16    5     |  8     139   1239  |
 |  5     1     29    |  379   378   89    |  239   4     6     |
 |--------------------+--------------------+--------------------|
 |  7     6     135   |  4     9     13    |  35    2     8     |
 |  9     4     135   |  8     2     136   |  356   7     13    |
 |  2     8     13    |  5     16    7     |  369   139   4     |
 |--------------------+--------------------+--------------------|
 |  1     5     8     |  379   37   *29    |  4     6    *29+3  |
 |  3    *29    7     |  6     5     4     |  1     8    *29    |
 |  6    *29    4     |  1     38   *29+8  |  29-3  5     7     |
 +--------------------------------------------------------------+
 # 51 eliminations remain
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