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immpy



Joined: 06 May 2017
Posts: 239

PostPosted: Mon Feb 18, 2019 2:18 pm    Post subject: Advanced for 021819 Reply with quote

Sticky bugger, but fun too. Enjoy...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immp
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 404
Location: Rimini, Italy

PostPosted: Mon Feb 18, 2019 8:20 pm    Post subject: Reply with quote

Hi everyone,

after some basics

Code:

+------------------+---------------+------------------+
| 5    7    3468   | 9    2   468  | 3468   68    1   |
| 1    468  24689  | 468  5   3    | 24678  26789 478 |
| 268  3468 234689 | 1468 147 4678 | 23468  2689  5   |
+------------------+---------------+------------------+
| 3    1    678    | 268  79  29   | 5      4     78  |
| 4    2    78     | 35   37  578  | 9      1     6   |
| 678  9    5      | 1468 147 4678 | 78     3     2   |
+------------------+---------------+------------------+
| 2678 4568 124678 | 35   349 29   | 124678 2678  478 |
| 26   345  134    | 7    8   45   | 14     26    9   |
| 9    48   2478   | 24   6   1    | 2478   5     3   |
+------------------+---------------+------------------+

Play this puzzle online at the Daily Sudoku site

2 String Kite with number 7 in r6c1,r9c7 SL in r7c1,r9c3 and -7 in r6c7

after basics

Code:

+--------------+-------------+---------------+
| 5   7   346  | 9   2   468 | 346   68   1  |
| 1   46  29   | 468 5   3   | 27    279  48 |
| 8   346 29   | 146 147 467 | 2346  269  5  |
+--------------+-------------+---------------+
| 3   1   68   | 68  9   2   | 5     4    7  |
| 4   2   78   | 35  37  578 | 9     1    6  |
| 67  9   5    | 146 147 467 | 8     3    2  |
+--------------+-------------+---------------+
| 267 456 1467 | 35  34  9   | 12467 2678 48 |
| 26  345 134  | 7   8   45  | 14    26   9  |
| 9   8   47   | 2   6   1   | 47    5    3  |
+--------------+-------------+---------------+

Play this puzzle online at the Daily Sudoku site

XY-Wing 4,6,8 in r1c8,r2c29 and -6 in r1c3

and other basics.

Ciao Gianni
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 338
Location: Sassari Italy

PostPosted: Sat Feb 23, 2019 4:04 pm    Post subject: Reply with quote

Hi everyone.
Code:

+------------------+---------------+------------------+
| 5    7    3468   | 9    2   468  | 3468   68    1   |
| 1    468  24689  | 468  5   3    | 24678  26789 478 |
| 268  3468 234689 | 1468 147 4678 | 23468  2689  5   |
+------------------+---------------+------------------+
| 3    1    678    | 268  79  29   | 5      4     78  |
| 4    2    78     | 35   37  578  | 9      1     6   |
| 678  9    5      | 1468 147 4678 | 78     3     2   |
+------------------+---------------+------------------+
| 2678 4568 124678 | 35   349 29   | 124678 2678  478 |
| 26   345  134    | 7    8   45   | 14     26    9   |
| 9    48   2478   | 24   6   1    | 2478   5     3   |
+------------------+---------------+------------------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R6C1=7=>contradiction =>-7R6C1=>solution
Ciao a Tutti
Paolo
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Clement



Joined: 24 Apr 2006
Posts: 980
Location: Dar es Salaam Tanzania

PostPosted: Fri Mar 08, 2019 7:46 pm    Post subject: Reply with quote

AjÚ Dimonios wrote:
Hi everyone.
Code:

+------------------+---------------+------------------+
| 5    7    3468   | 9    2   468  | 3468   68    1   |
| 1    468  24689  | 468  5   3    | 24678  26789 478 |
| 268  3468 234689 | 1468 147 4678 | 23468  2689  5   |
+------------------+---------------+------------------+
| 3    1    678    | 268  79  29   | 5      4     78  |
| 4    2    78     | 35   37  578  | 9      1     6   |
| 678  9    5      | 1468 147 4678 | 78     3     2   |
+------------------+---------------+------------------+
| 2678 4568 124678 | 35   349 29   | 124678 2678  478 |
| 26   345  134    | 7    8   45   | 14     26    9   |
| 9    48   2478   | 24   6   1    | 2478   5     3   |
+------------------+---------------+------------------+

Play this puzzle online at the Daily Sudoku site
One step after basics
If R6C1=7=>contradiction =>-7R6C1=>solution
Ciao a Tutti
Paolo
Show the steps where the contradiction occurs
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 338
Location: Sassari Italy

PostPosted: Sun Mar 10, 2019 12:21 pm    Post subject: Reply with quote

Hi Clement.
Clement wrote:
Quote:
Show the steps where the contradiction occurs

This is the situation that is created if R6C1 = 7. The contradiction in column 7 is evident, where there are two certain 3.
Code:

+----------+-------------+-------+
| 5 7   34 | 9   2   8   | 3 6 1 |
| 1 46  9  | 46  5   3   | 7 8 4 |
| 8 346 2  | 146 147 467 | 3 9 5 |
+----------+-------------+-------+
| 3 1   6  | 8   9   2   | 5 4 7 |
| 4 2   8  | 35  37  57  | 9 1 6 |
| 7 9   5  | 146 14  46  | 8 3 2 |
+----------+-------------+-------+
| 2 345 1  | 345 34  9   | 6 7 8 |
| 6 345 34 | 7   8   45  | 1 2 9 |
| 9 8   7  | 2   6   1   | 4 5 3 |
+----------+-------------+-------+

Play this puzzle online at the Daily Sudoku site

Ciao a Tutti
Paolo
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