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May 22 VH

 
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ZeroAssoluto



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

PostPosted: Sun May 22, 2022 8:54 am    Post subject: May 22 VH Reply with quote

Hi everyone,

Code:

+----------------+-------------+---------------+
| 456  1    46   | 9    7  2   | 3    468  58  |
| 4567 467  2    | 346  38 468 | 4569 1    59  |
| 3    8    9    | 46   1  5   | 46   2    7   |
+----------------+-------------+---------------+
| 1    3467 4678 | 2    9  48  | 457  3478 358 |
| 9    347  4578 | 1345 38 148 | 2    3478 6   |
| 2    34   458  | 345  6  7   | 19   348  19  |
+----------------+-------------+---------------+
| 67   5    3    | 8    2  16  | 167  9    4   |
| 467  2    467  | 167  5  9   | 8    367  13  |
| 8    9    1    | 67   4  3   | 67   5    2   |
+----------------+-------------+---------------+

Play this puzzle online at the Daily Sudoku site

first step
X-Wing with number 6 in r39c47 and -6 in r2c47,r7c7,r8c4

Code:

+----------------+-------------+--------------+
| 456  1    46   | 9    7  2   | 3   468  58  |
| 4567 467  2    | 34   38 468 | 459 1    59  |
| 3    8    9    | 46   1  5   | 46  2    7   |
+----------------+-------------+--------------+
| 1    3467 4678 | 2    9  48  | 457 3478 358 |
| 9    347  4578 | 1345 38 148 | 2   3478 6   |
| 2    34   458  | 345  6  7   | 19  348  19  |
+----------------+-------------+--------------+
| 67   5    3    | 8    2  16  | 17  9    4   |
| 467  2    467  | 17   5  9   | 8   367  13  |
| 8    9    1    | 67   4  3   | 67  5    2   |
+----------------+-------------+--------------+

Play this puzzle online at the Daily Sudoku site

second step
XY-Wing 1,6,7 in r7c67,r9c7 and -6 in r9c4

Or, with a single pass, AIC in r7c6
r7c6 = 6 and -6 in r2c6,r89c4
r7c6 = 1 r8c9=1 r8c8=3 r1c8=6 r3c4=6 and -6 in r2c6,r89c4

Ciao Gianni
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TomC



Joined: 30 Oct 2020
Posts: 349
Location: Wales

PostPosted: Sun May 22, 2022 10:06 am    Post subject: Reply with quote

You can remove <6> from r8c8 which then allows basic moves to solve
Code:

+------------------+--------------+-----------------+
|  456  1     46   | 9    7   2   |  3     468  58  |
|  4567 467   2    | 346  38  468 |  4569  1    59  |
|  3    8     9    | 46   1   5   |  46    2    7   |
+------------------+--------------+-----------------+
|  1    3467  4678 | 2    9   48  |  457   3478 358 |
|  9    347   4578 | 1345 38  148 |  2     3478 6   |
|  2    34    458  | 345  6   7   |  19    348  19  |
+------------------+--------------+-----------------+
| *67   5     3    | 8    2  c16  | b167   9    4   |
| *467  2    *467  | 167  5   9   |  8    x367  13  |
|  8    9     1    | 67   4   3   | a67    5    2   |
+------------------+--------------+-----------------+

If x=6, a=7, b=1, c=6 leads to no <6> in box 7 *

Play this puzzle online at the Daily Sudoku site
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Ghostrider13



Joined: 25 May 2022
Posts: 4
Location: United Kingdom, Brimington

PostPosted: Thu May 26, 2022 10:06 am    Post subject: Reply with quote

TomC wrote:
You can remove <6> from r8c8 which then allows basic moves to solve
Code:

+------------------+--------------+-----------------+
|  456  1     46   | 9    7   2   |  3     468  58  |
|  4567 467   2    | 346  38  468 |  4569  1    59  |
|  3    8     9    | 46   1   5   |  46    2    7   |
+------------------+--------------+-----------------+
|  1    3467  4678 | 2    9   48  |  457   3478 358 |
|  9    347   4578 | 1345 38  148 |  2     3478 6   |
|  2    34    458  | 345  6   7   |  19    348  19  |
+------------------+--------------+-----------------+
| *67   5     3    | 8    2  c16  | b167   9    4   |
| *467  2    *467  | 167  5   9   |  8    x367  13  |
|  8    9     1    | 67   4   3   | a67    5    2   |
+------------------+--------------+-----------------+

If x=6, a=7, b=1, c=6 leads to no <6> in box 7 *

Play this puzzle online at the Daily Sudoku site

Nice one! Twisted Evil
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