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 

Feb 13 VH

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



Joined: 30 May 2007
Posts: 587
Location: Victoria, KS

PostPosted: Wed Feb 13, 2008 3:32 pm    Post subject: Feb 13 VH Reply with quote

An x-wing, then a skyscraper (-7's) will finish it off.

Code:

+---------------+------------+--------------+
| 1     25   26 | 4  7   9   | 68  58   3   |
| 3579  3579 4  | 15 68  368 | 2   157  67  |
| 357   8    36 | 15 2   36  | 467 1457 9   |
+---------------+------------+--------------+
| 23459 3459 7  | 29 489 1   | 489 6    248 |
| 249   49   8  | 6  3   5   | 1   479  247 |
| 2349  6    1  | 7  489 248 | 5   3489 248 |
+---------------+------------+--------------+
| 8     47   9  | 3  1   46  | 67  2    5   |
| 47    1    5  | 29 469 246 | 3   78   678 |
| 6     23   23 | 8  5   7   | 49  49   1   |
+---------------+------------+--------------+

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



Joined: 12 Feb 2006
Posts: 5730
Location: Rochester, NY, USA

PostPosted: Wed Feb 13, 2008 4:39 pm    Post subject: Reply with quote

I did a multi-coloring on 6, which I think wasn't a factor, then a Type 4 UR on 15 solved it.
Back to top
View user's profile Send private message
Johan



Joined: 25 Jun 2007
Posts: 206
Location: Bornem Belgium

PostPosted: Wed Feb 13, 2008 4:51 pm    Post subject: Reply with quote

The possible [24] UR* in R56C19 eliminates <7> in R7C7, three possible ways to avoid the DP(Deadly Pattern)

A. R56C1=|9| => R5C2=|4| => R7C2=|7|

B. R5C9={7} => R5C8={9} => R5C2={4} => R7C2={7}

C. R6C9=<8> => R4C7=<9> => R9C7=<4> => R3C7=<7>

Code:
+--------------------------+--------------------------+--------------------------+
| 1         25        26   | 4          7       9     | 68       58        3     |
| 3579      79        4    | 15         68      368   | 2        157       67    |
| 57        8         36   | 15         2       36    | 4<7> C   1457      9     |
+--------------------------+--------------------------+--------------------------+
| 35        35        7    | 29        489      1     | 8<9>     6         248   |
|*24|9|   {|4|}9      8    | 6         3        5     | 1        7{9}     *24{7} |
|*24|9|     6         1    | 7         489      248   | 5        3        *24<8> |
+--------------------------+--------------------------+--------------------------+
| 8      AB 4{|7|}    9    | 3         1        46    | 6-[7]    2         5     |
| 47        1         5    | 29        469      246   | 3        78        678   |
| 6         23        23   | 8         5        7     |<4>9      49        1     |
+--------------------------+--------------------------+--------------------------+
Back to top
View user's profile Send private message Send e-mail
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Wed Feb 13, 2008 4:59 pm    Post subject: Reply with quote

I found a x-wing at r28c59 that removed <6> @ r28c6 (which may not have been useful), but a xy-wing with pivot @ r7c7 and pincers @ r1c7 & r8c8 deleted the 8 at r1c8 which broke the puzzle open.

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



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Wed Feb 13, 2008 5:09 pm    Post subject: Reply with quote

Marty R. wrote:
I did a multi-coloring on 6, which I think wasn't a factor, then a Type 4 UR on 15 solved it.


Marty,

Could your Type 4 UR also be viewed as a Type 3 UR using the <47> in r23c8 as a pseudo-single square plus the <79> in r5c8 and the <49> in r9c8 to form a locked set <479> thereby elilminating the <7> in r8c8?

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



Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL

PostPosted: Wed Feb 13, 2008 5:30 pm    Post subject: Reply with quote

A single XY wing was enough for me: 678 pivot R7C7.

Peter
Back to top
View user's profile Send private message Visit poster's website
Marty R.



Joined: 12 Feb 2006
Posts: 5730
Location: Rochester, NY, USA

PostPosted: Wed Feb 13, 2008 5:42 pm    Post subject: Reply with quote

Quote:
Marty,

Could your Type 4 UR also be viewed as a Type 3 UR using the <47> in r23c8 as a pseudo-single square plus the <79> in r5c8 and the <49> in r9c8 to form a locked set <479> thereby eliminating the <7> in r8c8?

I'm sorry Ted, I don't know. I think the strong link was on 1, so removal of the 5s solved the puzzle.
Back to top
View user's profile Send private message
Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA

PostPosted: Wed Feb 13, 2008 11:26 pm    Post subject: Reply with quote

Ted,

Yes, that 15 UR is also Type 3 and eliminates the <7> as you have noted.
Back to top
View user's profile Send private message Visit poster's website
George Woods



Joined: 28 Mar 2006
Posts: 296
Location: Dorset UK

PostPosted: Wed Feb 13, 2008 11:51 pm    Post subject: 1st Move Solution!!!!! Reply with quote

This VH has an XY as a possible first move (as proved by putting the resulting 5 in r1c8) in draw/play which then grades the reulting puzzle as easy!
Back to top
View user's profile Send private message
tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Thu Feb 14, 2008 2:36 am    Post subject: Reply with quote

Thanks all for your responses.

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