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 

Mar 07 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: 941
Location: Rimini, Italy
PostPosted: Tue Mar 06, 2018 11:17 pm    Post subject: Mar 07 VH Reply with quote
Hi everyone,

Code:

+--------------+---------------+--------------+
| 59    4   89 | 7   2    158  | 3   6    15  |
| 7     3   6  | 9   145  1458 | 148 145  2   |
| 2     58  1  | 3   45   6    | 489 459  7   |
+--------------+---------------+--------------+
| 3     9   2  | 45  1457 145  | 6   17   8   |
| 14    178 48 | 2   6    3    | 19  1579 159 |
| 16    167 5  | 8   179  19   | 2   3    4   |
+--------------+---------------+--------------+
| 8     2   7  | 1   3    49   | 5   49   6   |
| 14569 156 49 | 456 459  2    | 7   8    3   |
| 4569  56  3  | 456 8    7    | 149 2    19  |
+--------------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

first step
XY-Wing 1,5,9 in r1c19,r9c9 and -9 in r9c1

Code:

+-------------+-----------+--------+
| 59   4   89 | 7   2  58 | 3  6 1 |
| 7    3   6  | 9   1  48 | 48 5 2 |
| 2    58  1  | 3   45 6  | 48 9 7 |
+-------------+-----------+--------+
| 3    9   2  | 45  7  45 | 6  1 8 |
| 14   18  48 | 2   6  3  | 9  7 5 |
| 6    7   5  | 8   9  1  | 2  3 4 |
+-------------+-----------+--------+
| 8    2   7  | 1   3  9  | 5  4 6 |
| 1459 156 49 | 456 45 2  | 7  8 3 |
| 45   56  3  | 456 8  7  | 1  2 9 |
+-------------+-----------+--------+

Play this puzzle online at the Daily Sudoku site

second step
XY-Wing 4,5,9 in r19c1,r8c3 and -9 in r8c1,r1c3

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



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Wed Mar 07, 2018 10:15 am    Post subject: Reply with quote
Hi everyone


Code:

+--------------+---------------+--------------+
| 59    4   89 | 7   2    158  | 3   6    15  |
| 7     3   6  | 9   145  1458 | 148 145  2   |
| 2     58  1  | 3   45   6    | 489 459  7   |
+--------------+---------------+--------------+
| 3     9   2  | 45  1457 145  | 6   17   8   |
| 14    178 48 | 2   6    3    | 19  1579 159 |
| 16    167 5  | 8   179  19   | 2   3    4   |
+--------------+---------------+--------------+
| 8     2   7  | 1   3    49   | 5   49   6   |
| 14569 156 49 | 456 459  2    | 7   8    3   |
| 4569  56  3  | 456 8    7    | 149 2    19  |
+--------------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

Solution in one step
8R2C7 => contradiction (two 5 in C5) => - 8R2C7 => stte.




Code:

+----------+--------------+--------+
| 5  4   9 | 7   2    8   | 3 6  1 |
| 7  3   6 | 9   145  145 | 8 45 2 |
| 2  8   1 | 3   5    6   | 4 9  7 |
+----------+--------------+--------+
| 3  9   2 | 45  1457 145 | 6 17 8 |
| 4  17  8 | 2   6    3   | 9 17 5 |
| 16 167 5 | 8   179  19  | 2 3  4 |
+----------+--------------+--------+
| 8  2   7 | 1   3    49  | 5 4  6 |
| 9  156 4 | 56  5    2   | 7 8  3 |
| 6  56  3 | 456 8    7   | 1 2  9 |
+----------+--------------+--------+

Play this puzzle online at the Daily Sudoku site

Ciao a Tutti
Paolo
Back to top
View user's profile Send private message
Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Wed Mar 07, 2018 2:30 pm    Post subject: Reply with quote
Hi everyone


Code:

+--------------+---------------+--------------+
| 59    4   89 | 7   2    158  | 3   6    15  |
| 7     3   6  | 9   145  1458 | 148 145  2   |
| 2     58  1  | 3   45   6    | 489 459  7   |
+--------------+---------------+--------------+
| 3     9   2  | 45  1457 145  | 6   17   8   |
| 14    178 48 | 2   6    3    | 19  1579 159 |
| 16    167 5  | 8   179  19   | 2   3    4   |
+--------------+---------------+--------------+
| 8     2   7  | 1   3    49   | 5   49   6   |
| 14569 156 49 | 456 459  2    | 7   8    3   |
| 4569  56  3  | 456 8    7    | 149 2    19  |
+--------------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

Another solution in two steps

First step

When the 1 at r1c6 is true, the 9 at r8c3 is both true and false, so 1 must be false:
[1R1C6-(1=9)R6C6-9R6C5=9R8C5-9R8C3 and 1R1C6-(1=5)R1C9-(5=9)R1C1-9R1C3=9R8C3]=>-1R1C6


Code:

+-------------+-----------+--------+
| 59   4   89 | 7   2  58 | 3  6 1 |
| 7    3   6  | 9   1  48 | 48 5 2 |
| 2    58  1  | 3   45 6  | 48 9 7 |
+-------------+-----------+--------+
| 3    9   2  | 45  7  45 | 6  1 8 |
| 14   18  48 | 2   6  3  | 9  7 5 |
| 6    7   5  | 8   9  1  | 2  3 4 |
+-------------+-----------+--------+
| 8    2   7  | 1   3  9  | 5  4 6 |
| 1459 156 49 | 456 45 2  | 7  8 3 |
| 45   56  3  | 456 8  7  | 1  2 9 |
+-------------+-----------+--------+

Play this puzzle online at the Daily Sudoku site


Second step

[(5-9)R1C1=(9-1)R8C1=(1-4)R5C1=4R5C3 and (5-9)R1C1=9R1C3-(9=4)R8C3]=> contradiction (two 4 in C3)=>-5R1C1=>stte.
Ciao a Tutti
Paolo
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