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immpy



Joined: 06 May 2017
Posts: 295

PostPosted: Sat Mar 07, 2020 2:00 pm    Post subject: Advanced 030720 Reply with quote

Hello all, enjoy the puzzle...




Code:

+-------+-------+-------+
| . . 8 | . . . | 2 7 . |
| 1 . . | . . . | . . . |
| . 9 . | 3 5 . | 1 6 . |
+-------+-------+-------+
| . . . | . 8 . | . . 2 |
| . . . | 4 2 5 | . . . |
| 9 . . | . 3 . | . . . |
+-------+-------+-------+
| . 5 4 | . 1 7 | . 3 . |
| . . . | . . . | . . 7 |
| . 8 1 | . . . | 6 . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site

cheers...immp
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 502
Location: Rimini, Italy

PostPosted: Sat Mar 07, 2020 10:54 pm    Post subject: Reply with quote

Hi everyone,

2 steps

Code:

+----------------+----------------+----------------+
| 3456 346  8    | 169  469 1469  | 2    7   3459  |
| 1    2346 2356 | 2689 7   24689 | 4589 458 34589 |
| 24   9    7    | 3    5   248   | 1    6   48    |
+----------------+----------------+----------------+
| 3456 17   356  | 169  8   169   | 37   45  2     |
| 8    17   36   | 4    2   5     | 37   9   16    |
| 9    24   25   | 7    3   16    | 458  458 16    |
+----------------+----------------+----------------+
| 26   5    4    | 26   1   7     | 89   3   89    |
| 236  236  9    | 2568 46  2468  | 45   1   7     |
| 7    8    1    | 59   49  3     | 6    2   45    |
+----------------+----------------+----------------+

Play this puzzle online at the Daily Sudoku site

W-Wing 2,4 in r3c1,r6c2 SL with number 2 in r26c3 and -4 in r12c2,r4c1

Code:

+--------------+----------------+---------------+
| 3456 36  8   | 169  469 1469  | 2    7  3459  |
| 1    236 356 | 2689 7   24689 | 4589 58 34589 |
| 24   9   7   | 3    5   248   | 1    6  48    |
+--------------+----------------+---------------+
| 356  17  356 | 169  8   169   | 37   4  2     |
| 8    17  36  | 4    2   5     | 37   9  16    |
| 9    4   2   | 7    3   16    | 58   58 16    |
+--------------+----------------+---------------+
| 26   5   4   | 26   1   7     | 89   3  89    |
| 236  236 9   | 2568 46  2468  | 45   1  7     |
| 7    8   1   | 59   49  3     | 6    2  45    |
+--------------+----------------+---------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 4,5,8 in r2c8,r39c9 and -5 in r12c9

Ciao Gianni
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immpy



Joined: 06 May 2017
Posts: 295

PostPosted: Sun Mar 08, 2020 1:49 pm    Post subject: Reply with quote

Just recently grasped and got comfortable with a new (for me) solving skill, the Sue de Coq. It is quite powerful and it solves this puzzle in 1-step.
From the first grid (after basics)....
Sue de Coq: r4c1 - {3456} (r4c8 - {45}, r5c3 - {36}) =>r4c3<>36 (=5!) stte.

The elimination rules are that one can eliminate any 45 in the same row as the bi-value 45 cell and the 3456 cell excluding those inside box4, which results in no available eliminations in row 4. And one can eliminate any 3 or 6 inside of box4 other than the bi-value cell of 36 and the 3456 cell, which results in the elimination of 3 and 6 in r4c3. A beautiful, powerful technique!!

cheers...immp
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