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Sep 25 VH

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ZeroAssoluto

Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy

Posted: Sun Sep 25, 2022 9:23 am Post subject: Sep 25 VH

Hi everyone,

Code:

+------------+----------+-----------+
| 349 2 7 | 6 49 1 | 389 5 89 |
| 5 16 19 | 8 2 3 | 69 7 4 |
| 349 68 389 | 49 7 5 | 369 1 2 |
+------------+----------+-----------+
| 7 4 89 | 1 6 89 | 5 2 3 |
| 19 3 6 | 2 5 89 | 7 4 18 |
| 2 18 5 | 7 3 4 | 89 6 189 |
+------------+----------+-----------+
| 8 9 2 | 5 1 7 | 4 3 6 |
| 6 7 4 | 3 8 2 | 1 9 5 |
| 13 5 13 | 49 49 6 | 2 8 7 |
+------------+----------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:

XY-Wing 1,8,9 in r24c3,r6c2 and -1 in r2c2
or W-Wing
1,9 in r2c3,r5c1 SL with number 1 in r9c13 and -9 in r13c1,r4c3
1,9 in r2c3,r5c1 SL with number 1 in r26c2 and -9 in r13c1,r4c3
8,9 in r4c3,r6c7 SL with number 9 in r2c37 and -8 in r6c2

Ciao Gianni

TomC

Joined: 30 Oct 2020
Posts: 358
Location: Wales

Posted: Sun Sep 25, 2022 10:06 am Post subject:

There is a <89> Unique Rectangle in r16c79 to avoid

Remove <3> from r1c1 to solve

Code:

+---------------+----------+-------------+
| b349 2 7 | 6 49 1 | 389 5 89 |
| 5 16 19 | 8 2 3 | 69 7 4 |
| 349 68 389 | 49 7 5 | 369 1 2 |
+---------------+----------+-------------+
| 7 4 89 | 1 6 89 | 5 2 3 |
| d19 3 6 | 2 5 89 | 7 4 e18 |
| 2 18 5 | 7 3 4 | 89 6 189 |
+---------------+----------+-------------+
| 8 9 2 | 5 1 7 | 4 3 6 |
| 6 7 4 | 3 8 2 | 1 9 5 |
| c13 5 13 | 49 49 6 | 2 8 7 |
+---------------+----------+-------------+

If b=3 then r1c79 = <89>
If b=3, c=1, d<>1, e=1 then r6c79=<89>

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