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 16 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: 943
Location: Rimini, Italy
PostPosted: Wed Feb 16, 2022 10:40 am    Post subject: Feb 16 VH Reply with quote
Hi everyone,

Code:

+----------------+--------+-----------+
| 25   578  157  | 9 3 6  | 4   78 12 |
| 6    89   19   | 2 7 4  | 189 5  3  |
| 2349 3479 3479 | 5 1 8  | 79  6  29 |
+----------------+--------+-----------+
| 1    2    59   | 7 8 59 | 6   3  4  |
| 7    59   6    | 3 4 59 | 2   1  8  |
| 34   34   8    | 6 2 1  | 5   9  7  |
+----------------+--------+-----------+
| 345  3457 3457 | 1 9 2  | 38  48 6  |
| 8    1    39   | 4 6 7  | 39  2  5  |
| 49   6    2    | 8 5 3  | 179 47 19 |
+----------------+--------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
XYZ-Wing 1,7,9 in r39c7,r9c9 and -9 in r8c7
or
2 String Kite with number 9 in r39c1,r8c37 and -9 in r3c7
or
X-Wing with number 9 in r39c19 and -9 in r3c237,r9c7


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



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Wed Feb 16, 2022 12:58 pm    Post subject: Reply with quote
-1 in r2c7 as then <79> pair in c7, r8c7=3, r8c3=9 and r2c3 is also <1>
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Feb 17, 2022 12:42 pm    Post subject: Reply with quote
It's the old pirate's favourite - "pincers of eight" at (a) r1c8 and (d) r7c7.

One of these must be true for 8 so r7c8 < > 8.

Code:
+----------------+--------+-----------+
| 25   578  157  | 9 3 6  | 4  a78 12 |
| 6    89   19   | 2 7 4  | 189 5  3  |
| 2349 3479 3479 | 5 1 8  | b79 6  29 |
+----------------+--------+-----------+
| 1    2    59   | 7 8 59 | 6   3  4  |
| 7    59   6    | 3 4 59 | 2   1  8  |
| 34   34   8    | 6 2 1  | 5   9  7  |
+----------------+--------+-----------+
| 345  3457 3457 | 1 9 2  | d38 4-8 6 |
| 8    1    39   | 4 6 7  | c39 2  5  |
| 49   6    2    | 8 5 3  | 179 47 19 |
+----------------+--------+-----------+


Last edited by Mogulmeister on Thu Feb 17, 2022 2:51 pm; edited 1 time in total
Back to top
View user's profile Send private message
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Thu Feb 17, 2022 1:57 pm    Post subject: Reply with quote
You can also look at position (a) at r1c8 and say what if it is 7 ?

The above chain shows you that if you say a = 7 then d = 8 and r7c8 < > 8

But another route also shows that if a = 7 then r9c8 = 4 and r7c8 DOES = 8.



This contradictory result shows that (a) can never be 7.
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