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 

Oct 14 VH

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



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Thu Oct 14, 2021 9:21 am    Post subject: Oct 14 VH Reply with quote

Hi everyone,

Code:

+------------+-------------+----------+
| 7  5   9   | 26  36  236 | 48 1  48 |
| 1  8   3   | 7   9   4   | 6  5  2  |
| 6  2   4   | 5   8   1   | 9  7  3  |
+------------+-------------+----------+
| 5  49  18  | 269 136 236 | 23 48 7  |
| 3  6   2   | 4   7   8   | 5  9  1  |
| 89 479 178 | 29  135 235 | 23 48 6  |
+------------+-------------+----------+
| 4  3   78  | 1   2   9   | 78 6  5  |
| 2  1   5   | 8   46  67  | 47 3  9  |
| 89 79  6   | 3   45  57  | 1  2  48 |
+------------+-------------+----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 4,8,9 in r4c28,r6c1 and -8 in r4c3,r6c8
or
XY-Wing 4,8,9 in r4c2,r6c18 and -4 in r4c8,r6c2


Ciao Gianni
Back to top
View user's profile Send private message
TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Thu Oct 14, 2021 10:51 am    Post subject: Reply with quote

One of the XY wings solved it for me.

On reflection, I noticed a conflict in row 4

In r4c4 you have 269, if it is a 2 or 6 this would give r4c3=1 and in that case the puzzle would be invalid.

So r4c4 = 9
Back to top
View user's profile Send private message
ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Thu Oct 14, 2021 12:25 pm    Post subject: Reply with quote

Which XY-Wing is not working?
Back to top
View user's profile Send private message
TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Thu Oct 14, 2021 12:46 pm    Post subject: Reply with quote

Gianni,
Both your XY wings produce a solution, if I find one which solves the puzzle I rarely look for a different one.

I offer a different view to produce a solution.

Tom
Back to top
View user's profile Send private message
ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Thu Oct 14, 2021 12:57 pm    Post subject: Reply with quote

👌‍
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Fri Oct 15, 2021 8:46 am    Post subject: Reply with quote

TomC wrote:
One of the XY wings solved it for me.

On reflection, I noticed a conflict in row 4

In r4c4 you have 269, if it is a 2 or 6 this would give r4c3=1 and in that case the puzzle would be invalid.

So r4c4 = 9


Nice one Tom - I think I understand but of course r4c3 does equal 1 doesn't it ?
Back to top
View user's profile Send private message
TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Fri Oct 15, 2021 9:37 am    Post subject: Reply with quote

This was hard for me to describe, I'll try again

If r4c4 is either 2 or 6 then r6c4=9, r6c1=8, r4c3=1
this would then give row 4 to be

either
| 5 49 1 | 2 36 36 | 2 48 7 | (two 2's in row4)

or
| 5 49 1 | 6 3 2 | 3 48 7 | (two 3's in row4)

so r4c4 must be 9

also r4c3 is 1 but not if r4c4 is 2 or 6

Describing this is harder than how I saw this in the first place!
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Fri Oct 15, 2021 10:02 am    Post subject: Reply with quote

TomC wrote:


Describing this is harder than how I saw this in the first place!


Yes - a common problem for us all ! Very Happy
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151

PostPosted: Fri Oct 15, 2021 10:40 am    Post subject: Reply with quote

Mogulmeister wrote:
I showed the two sides of the ANP in this way to mirror the analysis of something that takes seconds by inspection but far longer to write down !


From a while back…..
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