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 

VH+ 051920

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
immpy



Joined: 06 May 2017
Posts: 297

PostPosted: Wed May 20, 2020 4:15 am    Post subject: VH+ 051920 Reply with quote

Hello all. Stay healthy, happy, and enjoy the puzzle...



Code:

+-------+-------+-------+
| 5 . . | . 9 . | 4 . . |
| . . 3 | 8 2 . | . . 5 |
| . 9 . | . . 3 | 2 . . |
+-------+-------+-------+
| 1 . . | . . . | . . . |
| . 4 . | 2 . 1 | . 3 . |
| . . . | . . . | . . 6 |
+-------+-------+-------+
| . . 4 | 9 . . | . 7 . |
| 2 . . | . 4 8 | 3 . . |
| . . 9 | . 5 . | . . 8 |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
Back to top
View user's profile Send private message
dongrave



Joined: 06 Mar 2014
Posts: 352

PostPosted: Sun Jun 07, 2020 3:25 pm    Post subject: Reply with quote

I see that this problem has been sitting around for a while! I finally got around to solving it today! I used the following 2-step solution:

After basics:
Code:

+-------------------+-------------+---------------+
| 5    1268   1268  | 16  9    7  | 4     168  3  |
| 67   167    3     | 8   2    4  | 1679  169  5  |
| 4    9      1678  | 5   16   3  | 2     168  17 |
+-------------------+-------------+---------------+
| 1    235678 25678 | 36  3678 59 | 5789  259  4  |
| 6789 4      5678  | 2   678  1  | 5789  3    79 |
| 3789 23578  2578  | 4   378  59 | 15789 1259 6  |
+-------------------+-------------+---------------+
| 38   1358   4     | 9   13   6  | 15    7    2  |
| 2    1567   1567  | 17  4    8  | 3     1569 19 |
| 367  1367   9     | 137 5    2  | 16    4    8  |
+-------------------+-------------+---------------+

Step 1: 1r7c5=r3c5-r3c9=r8c9 => r7c7 != 1

After Step 1:
Code:

+---------------+-----------+---------+
| 5    28   128 | 16 9    7 | 4  68 3 |
| 67   67   3   | 8  2    4 | 9  1  5 |
| 4    9    18  | 5  16   3 | 2  68 7 |
+---------------+-----------+---------+
| 1    2368 278 | 36 3678 9 | 78 5  4 |
| 68   4    5   | 2  678  1 | 78 3  9 |
| 9    38   78  | 4  378  5 | 1  2  6 |
+---------------+-----------+---------+
| 38   18   4   | 9  13   6 | 5  7  2 |
| 2    5    6   | 7  4    8 | 3  9  1 |
| 37   17   9   | 13 5    2 | 6  4  8 |
+---------------+-----------+---------+

Step 2: (6=3)r4c4-(3=1)r9c4-(1=7)r9c2-(7=6)r2c2 => r4c2 != 6
Back to top
View user's profile Send private message
immpy



Joined: 06 May 2017
Posts: 297

PostPosted: Mon Jun 08, 2020 6:29 pm    Post subject: Reply with quote

Nicely done dongrave. I needed six or seven steps using various wings, skyscrapers, etc.

cheers...immp
Back to top
View user's profile Send private message
dongrave



Joined: 06 Mar 2014
Posts: 352

PostPosted: Tue Jun 09, 2020 10:36 am    Post subject: Reply with quote

immpy wrote:
Nicely done dongrave. I needed six or seven steps using various wings, skyscrapers, etc.

cheers...immp

Thanks immp! With this recent pandemic I have a lot more free time on my hands. I still need to learn the fish solutions and skyscrapers and some other advanced techniques. I currently use X, XY, XYZ Wings or forcing chains, preferably with pincers on both ends which I learned a while ago from Marty and Clement! They also helped me get the hang of Eureka notation. Don.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other 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