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Apr 09 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 940
Location: Rimini, Italy
PostPosted: Sat Apr 09, 2022 9:44 am    Post subject: Apr 09 VH Reply with quote
Hi everyone,

Code:

+------------+------------+-------------+
| 9 23  4    | 7  135  35 | 125 6  8    |
| 8 7   36   | 69 1359 2  | 4   13 135  |
| 5 236 1    | 46 34   8  | 7   9  23   |
+------------+------------+-------------+
| 6 38  2358 | 48 248  9  | 125 7  1235 |
| 7 9   25   | 3  6    1  | 25  8  4    |
| 4 1   238  | 5  28   7  | 9   23 6    |
+------------+------------+-------------+
| 1 4   78   | 2  78   6  | 3   5  9    |
| 2 68  9    | 1  35   35 | 68  4  7    |
| 3 5   678  | 89 789  4  | 68  12 12   |
+------------+------------+-------------+

Play this puzzle online at the Daily Sudoku site

first step
XY-Wing 1,2,3 in r2c8,r39c9 and -1 in r2c9,r9c8

Code:

+------------+-----------+---------+
| 9 23  4    | 7  1   35 | 25 6 8  |
| 8 7   36   | 69 359 2  | 4  1 35 |
| 5 236 1    | 46 34  8  | 7  9 23 |
+------------+-----------+---------+
| 6 38  2358 | 48 248 9  | 1  7 25 |
| 7 9   25   | 3  6   1  | 25 8 4  |
| 4 1   28   | 5  28  7  | 9  3 6  |
+------------+-----------+---------+
| 1 4   78   | 2  78  6  | 3  5 9  |
| 2 68  9    | 1  35  35 | 68 4 7  |
| 3 5   678  | 89 789 4  | 68 2 1  |
+------------+-----------+---------+

Play this puzzle online at the Daily Sudoku site

second step
XY-Wing 2,3,5 in r1c27,r2c9 and -3 in r2c3

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 358
Location: Wales
PostPosted: Sun Apr 10, 2022 7:39 pm    Post subject: Reply with quote
My first step was the same as Gianni's

Then the X Wing on <8> in r67c35 was too easy to ignore -8 r4c5 (and others)

Leads to XY wing 34-2 pivot r3c5 gives -2 r4c9 to solve
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