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Mar 30 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Thu Mar 30, 2023 2:08 pm    Post subject: Mar 30 VH Reply with quote
Hi everyone,

Code:

+-------+---------+-------------+
| 8 1 7 | 25 4 9  | 235 2356 56 |
| 6 3 9 | 7  8 25 | 1   25   4  |
| 4 2 5 | 6  1 3  | 9   8    7  |
+-------+---------+-------------+
| 9 7 3 | 4  5 8  | 6   1    2  |
| 2 5 8 | 1  3 6  | 4   7    9  |
| 1 6 4 | 9  2 7  | 35  35   8  |
+-------+---------+-------------+
| 5 4 2 | 8  6 1  | 7   9    3  |
| 3 9 1 | 25 7 4  | 8   256  56 |
| 7 8 6 | 3  9 25 | 25  4    1  |
+-------+---------+-------------+

Play this puzzle online at the Daily Sudoku site

Quote:
Remote pair
2,5 in r28c,r2c6,r9c6,r9c7 and -2 -5 in r1c7,r8c8
2,5 in r1c4,r8c4,r9c6,r9c7 and -2 -5 in r1c7
2,5 in r2c8,r2c6,r9c6,r8c4 and -2 -5 in r8c8
Skyscraper
with number 2 in r1c7,r2c6 SL in r9c67 and -2 in r1c4,r2c8
with number 2 in r2c8,r9c7 SL in r29c6 and -2 in r1c7,r8c8
with number 2 in r2c6,r8c4 SL in r28c8 and -2 in r1c4,r9c6
with number 2 in r8c4,r9c7 SL in r1c47 and -2 in r8c8,r9c6
W-Wing
2,5 in r1c4,r2c8 SL with number 2 in r8c48 and -5 r1c789,r2c6
2,5 in r1c4,r9c6 SL with number 2 in r19c7 and -5 in r2c6,r8c4
2,5 in r2c8,r9c7 SL with number 5 in r6c78 and -2 in r1c7,r8c8
2,5 in r2c8,r9c7 SL with number 5 in r29c6 and -2 in r1c7,r8c8
2,5 in r2c8,r9c7 SL with number 5 in r18c9 and -2 in r1c7,r8c8
2,5 in r1c4,r9c7 SL with number 5 in r29c6 and -2 in r1c7
2,5 in r1c4,r9c7 SL with number 5 in r18c9 and -2 in r1c7
2,5 in r1c4,r9c7 SL with number 5 in r8c4,r9c6 and -2 in r1c7
2,5 in r2c8,r9c6 SL with number 2 in r8c48 and -5 in r2c6
2,5 in r2c8,r9c6 SL with number 2 in r19c7 and -5 in r2c6
2,5 in r2c8,r9c6 SL with number 2 in r8c8,r9c7 and -5 in r2c6
2,5 in r2c8,r8c4 SL with number 5 in r29c6 and -2 in r8c8
2,5 in r2c8,r8c4 SL with number 5 in r18c9 and -2 in r8c8
2,5 in r2c8,r8c4 SL with number 5 in r1c4,r2c6 and -2 in r8c8


Ciao Gianni
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Thu Mar 30, 2023 6:26 pm    Post subject: Reply with quote
To solve it using just standard VH moves (i.e. X Wings, XY Wings, and/or XYZ Wings) it looks like you have to use the X Wing on 5's in columns 4 and 9 (-5r1c78 and -5r8c8) which opens up a number of Wings that solve it including a 23-5 XY Wing with pivot at r1c7 (-5r6c8), a 25-6 XY Wing with pivot at r2c8 (-6r8c9), a 26-5 XY Wing with pivot at r8c8 (-5r1c9), and a 236 XYZ Wing with pivot at r1c8 (-2r2c8).
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Fri Mar 31, 2023 9:00 am    Post subject: Reply with quote
X wing on <5> followed by BUG pattern: r1c8 is NOT <36> so must be <2>
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