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ZeroAssoluto
Joined: 05 Feb 2017 Posts: 933 Location: Rimini, Italy
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Posted: Tue May 31, 2022 1:17 pm Post subject: May 31 VH |
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Hi everyone,
Code: |
+-----------+-------+------------+
| 9 5 8 | 4 3 6 | 2 7 1 |
| 236 13 12 | 9 7 8 | 4 5 36 |
| 36 4 7 | 2 1 5 | 69 89 3689 |
+-----------+-------+------------+
| 7 9 5 | 1 6 2 | 8 3 4 |
| 1 8 6 | 3 5 4 | 7 29 29 |
| 4 2 3 | 7 8 9 | 1 6 5 |
+-----------+-------+------------+
| 23 37 9 | 6 4 1 | 5 28 278 |
| 5 67 4 | 8 2 3 | 69 1 679 |
| 8 16 12 | 5 9 7 | 3 4 26 |
+-----------+-------+------------+
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Play this puzzle online at the Daily Sudoku site
Quote: | XY-Wing
1,3,6 in r2c29,r9c2 and -6 in r9c9
2,6,9 in r59c9,r8c7 and -9 in r8c9 |
Ciao Gianni |
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TomC
Joined: 30 Oct 2020 Posts: 358 Location: Wales
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Posted: Tue May 31, 2022 2:23 pm Post subject: |
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I was drawn to a potential 23-6 XY wing (abc)
Not to be, but if x=2, a + c would both be <6> and lead to a contradiction
so r7c8=8 to solve
Code: |
+------------+-------+---------------+
| 9 5 8 | 4 3 6 | 2 7 1 |
| 236 13 12 | 9 7 8 | 4 5 *36 |
| a36 4 7 | 2 1 5 | *69 89 *3689 |
+------------+-------+---------------+
| 7 9 5 | 1 6 2 | 8 3 4 |
| 1 8 6 | 3 5 4 | 7 29 29 |
| 4 2 3 | 7 8 9 | 1 6 5 |
+------------+-------+---------------+
| b23 37 9 | 6 4 1 | 5 x28 x278 |
| 5 67 4 | 8 2 3 | 69 1 679 |
| 8 16 12 | 5 9 7 | 3 4 c26 |
+------------+-------+---------------+
If x=2, c=6 also b=3, a=6 leads to no <6>'s in box 3 *
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As a chain I think it would be:
(8=2)r7c8-(2=6)r9c9-(9=6)r3c7-(6=3)r3c1-(3=2)r7c1-(2=8)r7c8
r7c8 <> 2 to solve |
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glesco
Joined: 12 May 2022 Posts: 36
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Posted: Tue Jun 07, 2022 10:28 pm Post subject: |
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269 xy-wing which eliminates 9 at r8c9. stte from there. |
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