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 10/09/02: C

 
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: Thu Sep 02, 2010 3:34 am    Post subject: Puzzle 10/09/02: C Reply with quote
Code:
 +-----------------------+
 | . . . | . . 9 | . 6 5 |
 | . 8 . | . . . | 9 . . |
 | . 7 4 | . . 5 | . . . |
 |-------+-------+-------|
 | . . . | 9 . . | 1 . 7 |
 | . . . | . . 3 | 4 . . |
 | 5 2 . | . 4 . | . 9 . |
 |-------+-------+-------|
 | . 5 . | . 8 . | . . . |
 | 1 . . | . . 4 | . . . |
 | 4 3 . | 1 . . | . . . |
 +-----------------------+

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: 494
Location: Charleroi, Belgium
PostPosted: Thu Sep 02, 2010 11:45 am    Post subject: Reply with quote
Quote:
5-SIS M Wing loop (13) : 1C5 3C5 3C8 3R6 1C3 loop : r2c5<>2,r8c479<>3,r6c3<>67
4-SIS AIC : 1C3 7R5 8C1 8C6 : (1)r6c3=(8)r6c6 : => r6c6<>1
XY Wing (36-2), pivot at R6C7 : => r3c9<>2
Back to top
View user's profile Send private message
JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium
PostPosted: Thu Sep 02, 2010 6:52 pm    Post subject: Reply with quote
Second run ...
Quote:
I cannot resist a continuous loop Very Happy ... But as the 2 1st steps in the previous proof have essentially the cell R6C3 as a target, it appears that the elimination of (3)r6c3 is done through a very simple 3-SIS step that conveniently replace them.

An alternative proof :

XY Wing Style : (38)R4C1 8C6 1R6 : (3)r4c1=(1)r6c3 : r6c3<>3
XY Wing (36-2), pivot at R6C7 : => r3c9<>2

Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sat Sep 04, 2010 4:35 am    Post subject: Reply with quote
The DP killers of the potential 28 DP in boxes 79 yielded some common eliminations. Following that, the 28 became a Type 1 UR followed by a BUG+2.
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