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VH+ 051920

 
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immpy



Joined: 06 May 2017
Posts: 574
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
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dongrave



Joined: 06 Mar 2014
Posts: 572
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
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immpy



Joined: 06 May 2017
Posts: 574
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
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dongrave



Joined: 06 Mar 2014
Posts: 572
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.
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