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immpy



Joined: 06 May 2017
Posts: 186

PostPosted: Wed Oct 10, 2018 1:07 pm    Post subject: Advanced 101018 Reply with quote

Here is the puzzle I meant to post in my previous topic.
Enjoy everyone...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 285
Location: Rimini, Italy

PostPosted: Wed Oct 10, 2018 7:19 pm    Post subject: Reply with quote

Hi everyone,

I chose to use the XY-Chain

Code:

+-----------+-----------+-----------+
| 6   9 7   | 8   1  2  | 3   5 4   |
| 1   2 5   | 4   3  7  | 9   8 6   |
| 4   8 3   | 6   9  5  | 1   7 2   |
+-----------+-----------+-----------+
| 7   6 248 | 12  45 18 | 25  9 3   |
| 3   5 248 | 29  47 89 | 6   1 78  |
| 89  1 289 | 3   57 6  | 257 4 578 |
+-----------+-----------+-----------+
| 59  3 6   | 179 8  19 | 4   2 157 |
| 2   7 1   | 5   6  4  | 8   3 9   |
| 589 4 89  | 179 2  3  | 57  6 157 |
+-----------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site

1) r4c4-2-r4c7-5-r4c5-4-r5c5-7-r5c9-8-r5c6-9-r7c6 and -1 in r4c6,r79c4

Code:

+-----------+---------+-----------+
| 6   9 7   | 8  1  2 | 3   5 4   |
| 1   2 5   | 4  3  7 | 9   8 6   |
| 4   8 3   | 6  9  5 | 1   7 2   |
+-----------+---------+-----------+
| 7   6 24  | 1  45 8 | 25  9 3   |
| 3   5 48  | 2  47 9 | 6   1 78  |
| 89  1 289 | 3  57 6 | 257 4 578 |
+-----------+---------+-----------+
| 59  3 6   | 79 8  1 | 4   2 57  |
| 2   7 1   | 5  6  4 | 8   3 9   |
| 589 4 89  | 79 2  3 | 57  6 1   |
+-----------+---------+-----------+

Play this puzzle online at the Daily Sudoku site

2) r6c1-9-r7c1-5-r7c9-7-r5c9-8-r5c3-4-r4c3-2-r4c7-5-r9c7-7-r9c4-9-r9c3 and -8 inr56c3,r9c1

Ciao Gianni
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Aj Dimonios



Joined: 01 May 2017
Posts: 324
Location: Sassari Italy

PostPosted: Thu Oct 11, 2018 5:48 pm    Post subject: Reply with quote

Hi everyone.
Code:

+------------+-----------+-----------+
| 6   9 7    | 8   1  2  | 3   5 4   |
| 1   2 5    | 4   3  7  | 9   8 6   |
| 4   8 3    | 6   9  5  | 1   7 2   |
+------------+-----------+-----------+
| 7   6 248  | 12  45 18 | 25  9 3   |
| 3   5 248  | 29  47 89 | 6   1 78  |
| 89  1 289  | 3   57 6  | 257 4 578 |
+------------+-----------+-----------+
| 59  3 6    | 179 8  19 | 4   2 157 |
| 2   7 1    | 5   6  4  | 8   3 9   |
| 589 4 89   | 179 2  3  | 57  6 157 |
+------------+-----------+-----------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R4C7=2=>contradiction =>-2R4C7=>solution.
2R4C7-(2=1)R4C4-1R9C4;(2-5)R4C7=5R6C79-(5=7)R6C5-7R6C7=7R9C7-7R9C4 and 2R4C7-2R6C7=(2-9)R6C3=9R9C3-9R9C4=> R9C4==>-2R4C7=>stte
Ciao a Tutti
Paolo
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immpy



Joined: 06 May 2017
Posts: 186

PostPosted: Sun Oct 14, 2018 7:51 am    Post subject: Reply with quote

Elegant solutions guys!

cheers...immp
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