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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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 Posted: Sun May 01, 2022 6:26 am Post subject: May 01 VH |
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| Code: |
+---------+---------------+--------+
| 7 4 5 | 3 6 2 | 1 8 9 |
| 9 3 8 | 1 47 47 | 5 6 2 |
| 2 6 1 | 89 89 5 | 4 3 7 |
+---------+---------------+--------+
| 6 2 3 | 48 5 48 | 7 9 1 |
| 1 5 4 | 6 79 79 | 3 2 8 |
| 8 9 7 | 2 1 3 | 6 4 5 |
+---------+---------------+--------+
| 4 1 a69 | 7 x389 x89 | 2 5 36 |
| 3 8 b26 | 5 c24 1 | 9 7 46 |
| 5 7 x29 | d49 2349 6 | 8 1 34 |
+---------+---------------+--------+
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Play this puzzle online at the Daily Sudoku site
| Quote: | XY chain a-d or d-a gives pincers on <9> in a and d leads to -9 in x to solve
Standard solutions involving <489> work as well |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Sun May 01, 2022 7:25 am Post subject: |
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Also deadly pattern in r257c56 of <47> <79> <89> is avoided by -3 in r9c5 so r9c9 = 3 to solve
(this works but not sure of the logic now!) |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
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| Posted: Sun May 01, 2022 8:36 am Post subject: |
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Hi everyone,
| Quote: | XY-Wing
4,8,9 in r49c4,r7c6 and -8 in r4c6
2,4,9 in r8c5,r9c34 and -2 in r8c3,r9c5
4,8,9 in r47c6,r9c4 and -4 in r4c4
or
W-Wing
8,9 in r3c5,r7c6 SL with number 9 in r39c4 and -8 in r7c5
8,9 in r3c5,r7c6 SL with number 9 in r5c56 and -8 in r7c5
8,9 in r3c4,r7c6 SL with number 8 in r37c5 and -9 in r9c4
8,9 in r3c4,r7c6 SL with number 8 in r4c46 and -9 in r9c4 |
Ciao Gianni |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed May 04, 2022 10:00 am Post subject: |
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| TomC wrote: | Also deadly pattern in r257c56 of <47> <79> <89> is avoided by -3 in r9c5 so r9c9 = 3 to solve
(this works but not sure of the logic now!) |
The UR means that r7c5 must be 3 which solves the puzzle, Tom ? |
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TomC
Joined: 30 Oct 2020
Posts: 358
Location: Wales
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| Posted: Wed May 04, 2022 2:00 pm Post subject: |
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Thanks, I was not sure about the UR but I did know that r9c5 <> 3
If r9c5=3, <89> pair in r7c56 gives a=6 and d=4 when either a or d must be <9> |
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Mogulmeister
Joined: 03 May 2007
Posts: 1151
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| Posted: Wed May 04, 2022 3:12 pm Post subject: |
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| ..nice way of looking at it. |
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