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immpy
Joined: 06 May 2017
Posts: 574
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 Posted: Thu Jul 05, 2018 12:51 am Post subject: A neat VH for the 4th of July!! |
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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 | . . . |
+-------+-------+-------+
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Play this puzzle online at the Daily Sudoku site
cheers...immp |
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Clement
Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
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| Posted: Sun Jul 08, 2018 10:58 am Post subject: A neat VH for the 4th of July!! |
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| 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 |
+----------------+------------------------+---------------------+
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(2=9)r5c7 - (9=8)r6c6789 - (8=2)r7c6 => -2 r5c6; stte |
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dongrave
Joined: 06 Mar 2014
Posts: 572
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| Posted: Sun Jul 08, 2018 2:22 pm Post subject: |
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| 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: 574
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| Posted: Tue Jul 10, 2018 2:18 am Post subject: |
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| 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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