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immpy
Joined: 06 May 2017
Posts: 574
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 Posted: Mon Feb 18, 2019 2:18 pm Post subject: Advanced for 021819 |
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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: 1019
Location: Rimini, Italy
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| Posted: Mon Feb 18, 2019 8:20 pm Post subject: |
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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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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Sat Feb 23, 2019 4:04 pm Post subject: |
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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: 1113
Location: Dar es Salaam Tanzania
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| Posted: Fri Mar 08, 2019 7:46 pm Post subject: |
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| Ajò 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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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Sun Mar 10, 2019 12:21 pm Post subject: |
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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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WorldO
Joined: 04 May 2016
Posts: 5
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| Posted: Mon Jun 22, 2020 9:16 am Post subject: |
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I see now why I missed Sue de Coq. It was no longer available due to the Naked Triple, which essentially made the same eliminations. Still a nice technique. I needed something similar to Clement's last two steps to solve as well.
check: Add music to video with built-in 900+ background music for videos |
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