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 

May 5, Need some help

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles
View previous topic :: View next topic  
Author Message
Steve M
Guest





PostPosted: Mon May 08, 2006 3:47 pm    Post subject: May 5, Need some help Reply with quote

This one has stumped both my wife and me. We both got to this point.

4 6 12 8 27 9 3 5 17
9 58 12 1357 2347 124 67 1478 1467
58 7 3 15 46 146 2 148 9
2 9 8 4 5 7 1 6 3
3 4 6 2 1 8 59 79 57
7 1 5 6 9 3 4 2 8
1 25 4 9 267 26 8 3 567
568 258 7 13 23468 1246 59 149 1456
68 3 9 17 4678 5 67 147 2

What is the key here?
Back to top
David Bryant



Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado

PostPosted: Mon May 08, 2006 5:14 pm    Post subject: Use the "X-Wing" on 7 Reply with quote

Hi, Steve!

This puzzle has already been discussed extensively, over here.

Briefly, there are only two ways to enter a "7" in row 1 (at r1c5 & r1c9) and there are also only two ways to enter a "7" in row 7 (at r7c5 & r7c9). So there's either a "7" at r1c5 and a "7" at r7c9, or else there's a "7" at r7c5 and a "7" at r1c9. Either way there cannot possibly be a "7" at r5c9, therefore r5c9 = 5.

Alternatively you can analyze the possible positions for a "7" in columns 4 & 7 to conclude that the "7" in column 8 must appear at r5c8.

Happy sudokuing! dcb
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Steve M
Guest





PostPosted: Tue May 09, 2006 11:24 am    Post subject: Thanks Reply with quote

Thanks , That was what we needed.
Back to top
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles 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