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Apr 01 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Fri Apr 01, 2022 8:31 am    Post subject: Apr 01 VH Reply with quote

Hi everyone,

Code:

+------------+-------------+--------------+
| 8   7  239 | 2359 4 2359 | 1   39  6    |
| 259 4  1   | 2389 6 2389 | 357 379 389  |
| 569 56 39  | 389  1 7    | 345 2   3489 |
+------------+-------------+--------------+
| 7   28 5   | 148  3 148  | 9   6   24   |
| 4   9  28  | 78   5 6    | 37  1   23   |
| 1   3  6   | 479  2 49   | 8   47  5    |
+------------+-------------+--------------+
| 25  1  7   | 6    8 25   | 34  349 349  |
| 69  68 89  | 34   7 34   | 2   5   1    |
| 3   25 4   | 125  9 125  | 6   8   7    |
+------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 3,4,7 in r57c7,r6c8 and -4 in r7c8

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sun Apr 03, 2022 6:13 pm    Post subject: Reply with quote

Code:

+-------------+-------------+---------------+
| 8   7   239 | 2359 4 2359 | 1    39  6    |
| 259 4   1   | 2389 6 2389 | 357  379 389  |
| 569 56b 39  | 389  1 7    | 345a 2   3489 |
+-------------+-------------+---------------+
| 7   28d  5  | 148  3 148  | 9    6   24e  |
| 4   9   28  | 78   5 6    | 37   1   23   |
| 1   3   6   | 479  2 49   | 8    47  5    |
+-------------+-------------+---------------+
| 25  1   7   | 6    8 25   | 34   349 349  |
| 69  68c 89  | 34   7 34   | 2    5   1    |
| 3   25  4   | 125  9 125  | 6    8   7    |
+-------------+-------------+---------------+

If a=5 then e=4 leads to no <4> in box 3 (or a=4 if you like)
so r2c7 = 5 to solve

Or you could say that it doesn't matter what value is in b, c, d or e because then a cannot be <5>
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