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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 933
Location: Rimini, Italy
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 Posted: Sat Jan 08, 2022 10:55 am Post subject: Jan 08 VH |
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Hi everyone,
| Code: |
+--------+-------------+--------+
| 2 5 7 | 13 14 34 | 9 6 8 |
| 1 3 6 | 8 9 7 | 5 4 2 |
| 9 8 4 | 25 25 6 | 1 7 3 |
+--------+-------------+--------+
| 6 4 9 | 7 3 2 | 8 1 5 |
| 5 1 2 | 4 8 9 | 7 3 6 |
| 3 7 8 | 56 56 1 | 2 9 4 |
+--------+-------------+--------+
| 4 2 15 | 9 16 35 | 36 8 7 |
| 8 6 15 | 135 7 345 | 34 2 9 |
| 7 9 3 | 26 246 8 | 46 5 1 |
+--------+-------------+--------+
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Play this puzzle online at the Daily Sudoku site
| Quote: | XY-Wing
1,3,5 in r7c36,r8c4 and -1 in r7c5,r8c3
1,3,5 in r7c6,r8c34 and -5 in r7c3,r8c6
1,3,6 in r7c57,r8c4 and -3 in r7c6,r8c7
or
XYZ-Wing 3,4,5 in r7c6,r8c67 and -3 in r8c4
or
W-Wing 3,4 in r1c6,r8c7 SL with number 3 in r7c67 and -4 in r8c6 |
Ciao Gianni |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sat Jan 08, 2022 1:44 pm Post subject: |
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| Gianni, is there not another basic move needed before the XY wings will work? |
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dongrave
Joined: 06 Mar 2014
Posts: 568
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| Posted: Sat Jan 08, 2022 1:55 pm Post subject: |
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| I think so Tom. There are 5's locked candidates in column 6 removing the 5 from r8c4. (Or you could use the hidden pair 1-3 in column 4 or the 256 naked triple in the same column.) |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 933
Location: Rimini, Italy
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| Posted: Sat Jan 08, 2022 3:41 pm Post subject: |
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Yes,
the 5 in r8c4 had to be eliminated.
My usual issues with "auto sweep" when using the smartphone.
Ciao Gianni |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sat Jan 08, 2022 3:51 pm Post subject: |
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Another way to solve is by the nearly <26> pair in r9
If r9c7=4, <26> pair gives r7c5=1, r8c4=3, r8c7= also 4!
r9c7 must be <6> |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sat Jan 08, 2022 4:54 pm Post subject: |
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| or pincers on <6> in r7c5 and r9c7 gives -6 in r9c45 and r7c7 |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Mon Jan 10, 2022 11:16 am Post subject: |
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There's a rare (in my experience anyway) extended Unique Rectangle (2 x 3) at
r369c45 [25-56-26]. Essentially, to break the deadly pattern r9c5 has to be 4 so eliminating <26>. |
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