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A neat VH for the 4th of July!!

 
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immpy



Joined: 06 May 2017
Posts: 186

PostPosted: Thu Jul 05, 2018 12:51 am    Post subject: A neat VH for the 4th of July!! Reply with quote

Using only VH solving tactics, this one was fun.
Happy Holiday!...and enjoy the puzzle.

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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Clement



Joined: 24 Apr 2006
Posts: 929
Location: Dar es Salaam Tanzania

PostPosted: Sun Jul 08, 2018 10:58 am    Post subject: A neat VH for the 4th of July!! Reply with quote

Code:

+----------------+------------------------+---------------------+
| 89     3     1 | 28        6        5   | 4       29      7   |
| 58     6     7 | 4         28       9   | 1       3       25  |
| 59     4     2 | 137       17       37  | 69      569     8   |
+----------------+------------------------+---------------------+
| 1      5     9 | 267       27       4   | 267     8       3   |
| 7      8     6 | 239       5        3-2 |a29      4       1   |
| 4      2     3 | 16789     1789    b678 |b679    b569    b569 |
+----------------+------------------------+---------------------+
| 6      1     5 | 289       4       c28  | 3       7       29  |
| 2      9     8 | 67        3        67  | 5       1       4   |
| 3      7     4 | 5         29       1   | 8       269     269 |
+----------------+------------------------+---------------------+

(2=9)r5c7 - (9=8)r6c6789 - (8=2)r7c6 => -2 r5c6; stte
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dongrave



Joined: 06 Mar 2014
Posts: 326

PostPosted: Sun Jul 08, 2018 2:22 pm    Post subject: Reply with quote

Using just VH moves, starting with the same grid as Clement, I used the 23-7 XY-Wing w pivot r5c6, then I saw the 7 X-Wing (but I noticed later that it wasn't necessary). Then I used a 68-2 XY-Wing that opened up a 29-8 XY-Wing but then I noticed that THAT wasn't necessary either! So I think only the 2 VH moves (i.e. two XY-Wings) were needed. Thanks for the puzzle!
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immpy



Joined: 06 May 2017
Posts: 186

PostPosted: Tue Jul 10, 2018 2:18 am    Post subject: Reply with quote

Yes indeed, one could use a variety of moves....X-Wings, XY-Wings, I think there was even a possible Skyscraper in there, depending on earlier moves used. Glad you liked the puzzle...you are welcome.
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