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Too Hard 050318

 
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Thu May 03, 2018 5:53 pm    Post subject: Too Hard 050318 Reply with quote
Enjoy the puzzle...

Code:

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

Play this puzzle online at the Daily Sudoku site

cheers...immpy
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Thu May 03, 2018 9:01 pm    Post subject: Reply with quote
Hi everyone

Code:

+-------------+-------------+-----------+
| 2378 9 2378 | 4  13  137  | 23  5  6  |
| 236  1 236  | 5  8   369  | 4   29 7  |
| 367  5 4    | 2  369 3679 | 39  8  1  |
+-------------+-------------+-----------+
| 28   7 1    | 69 4   5689 | 56  3  29 |
| 5    6 28   | 3  19  189  | 7   29 4  |
| 4    3 9    | 7  2   56   | 56  1  8  |
+-------------+-------------+-----------+
| 1369 2 36   | 8  369 4    | 19  7  5  |
| 39   4 5    | 1  7   239  | 8   6  29 |
| 1679 8 67   | 69 5   269  | 129 4  3  |
+-------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

AIC (3=1)R1C5-(1=9)R5C5-(9=2)R5C8-2R2C8=2R1C7=>-3R1C7=>Stte


Ciao a Tutti
Paolo
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Thu May 03, 2018 10:19 pm    Post subject: Reply with quote
Hi everyone,

Code:

+-------------+-------------+-----------+
| 2378 9 2378 | 4  13  137  | 23  5  6  |
| 236  1 236  | 5  8   369  | 4   29 7  |
| 367  5 4    | 2  369 3679 | 39  8  1  |
+-------------+-------------+-----------+
| 28   7 1    | 69 4   5689 | 56  3  29 |
| 5    6 28   | 3  19  189  | 7   29 4  |
| 4    3 9    | 7  2   56   | 56  1  8  |
+-------------+-------------+-----------+
| 1369 2 36   | 8  369 4    | 19  7  5  |
| 39   4 5    | 1  7   239  | 8   6  29 |
| 1679 8 67   | 69 5   269  | 129 4  3  |
+-------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

UR with 5,6 in r46c67 and -5 -6 in r4c6

and

Code:

+-------------+------------+----------+
| 2378 9 2378 | 4 13  137  | 23 5  6  |
| 236  1 236  | 5 8   369  | 4  29 7  |
| 367  5 4    | 2 369 3679 | 39 8  1  |
+-------------+------------+----------+
| 28   7 1    | 6 4   89   | 5  3  29 |
| 5    6 28   | 3 19  189  | 7  29 4  |
| 4    3 9    | 7 2   5    | 6  1  8  |
+-------------+------------+----------+
| 19   2 36   | 8 36  4    | 19 7  5  |
| 39   4 5    | 1 7   23   | 8  6  29 |
| 167  8 67   | 9 5   26   | 12 4  3  |
+-------------+------------+----------+

Play this puzzle online at the Daily Sudoku site

Skyscraper with 9 in r2c68,r4c69 and -9 in r5c8

Ciao Gianni
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Fri May 04, 2018 11:47 am    Post subject: Too Hard 050318 Reply with quote
ZeroAssoluto wrote:
Hi everyone,

Code:

+-------------+-------------+-----------+
| 2378 9 2378 | 4  13  137  | 23  5  6  |
| 236  1 236  | 5  8   369  | 4   29 7  |
| 367  5 4    | 2  369 3679 | 39  8  1  |
+-------------+-------------+-----------+
| 28   7 1    | 69 4   5689 | 56  3  29 |
| 5    6 28   | 3  19  189  | 7   29 4  |
| 4    3 9    | 7  2   56   | 56  1  8  |
+-------------+-------------+-----------+
| 1369 2 36   | 8  369 4    | 19  7  5  |
| 39   4 5    | 1  7   239  | 8   6  29 |
| 1679 8 67   | 69 5   269  | 129 4  3  |
+-------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

UR with 5,6 in r46c67 and -5 -6 in r4c6

and

Code:

+-------------+------------+----------+
| 2378 9 2378 | 4 13  137  | 23 5  6  |
| 236  1 236  | 5 8   369  | 4  29 7  |
| 367  5 4    | 2 369 3679 | 39 8  1  |
+-------------+------------+----------+
| 28   7 1    | 6 4   89   | 5  3  29 |
| 5    6 28   | 3 19  189  | 7  29 4  |
| 4    3 9    | 7 2   5    | 6  1  8  |
+-------------+------------+----------+
| 19   2 36   | 8 36  4    | 19 7  5  |
| 39   4 5    | 1 7   23   | 8  6  29 |
| 167  8 67   | 9 5   26   | 12 4  3  |
+-------------+------------+----------+

Play this puzzle online at the Daily Sudoku site

Skyscraper with 9 in r2c68,r4c69 and -9 in r5c8

Ciao Gianni
I can't see the skyscrapers in r2c68, r4c69 eliminating 9 r5c8 as the 9's are weakly linked in c6. Can you show the steps?
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Fri May 04, 2018 12:12 pm    Post subject: Re: Too Hard 050318 Reply with quote
Clement wrote:
ZeroAssoluto wrote:
Hi everyone,

Code:

+-------------+-------------+-----------+
| 2378 9 2378 | 4  13  137  | 23  5  6  |
| 236  1 236  | 5  8   369  | 4   29 7  |
| 367  5 4    | 2  369 3679 | 39  8  1  |
+-------------+-------------+-----------+
| 28   7 1    | 69 4   5689 | 56  3  29 |
| 5    6 28   | 3  19  189  | 7   29 4  |
| 4    3 9    | 7  2   56   | 56  1  8  |
+-------------+-------------+-----------+
| 1369 2 36   | 8  369 4    | 19  7  5  |
| 39   4 5    | 1  7   239  | 8   6  29 |
| 1679 8 67   | 69 5   269  | 129 4  3  |
+-------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

UR with 5,6 in r46c67 and -5 -6 in r4c6

and

Code:

+-------------+------------+----------+
| 2378 9 2378 | 4 13  137  | 23 5  6  |
| 236  1 236  | 5 8   369  | 4  29 7  |
| 367  5 4    | 2 369 3679 | 39 8  1  |
+-------------+------------+----------+
| 28   7 1    | 6 4   89   | 5  3  29 |
| 5    6 28   | 3 19  189  | 7  29 4  |
| 4    3 9    | 7 2   5    | 6  1  8  |
+-------------+------------+----------+
| 19   2 36   | 8 36  4    | 19 7  5  |
| 39   4 5    | 1 7   23   | 8  6  29 |
| 167  8 67   | 9 5   26   | 12 4  3  |
+-------------+------------+----------+

Play this puzzle online at the Daily Sudoku site

Skyscraper with 9 in r2c68,r4c69 and -9 in r5c8

Ciao Gianni
I can't see the skyscrapers in r2c68, r4c69 eliminating 9 r5c8 as the 9's are weakly linked in c6. Can you show the steps?
Sorry, I can see now, any position 9 takes in c6 eliminates 9 inr5c8.
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immpy



Joined: 06 May 2017
Posts: 571
PostPosted: Fri May 04, 2018 1:53 pm    Post subject: Reply with quote
Beautiful, folks! Nice solutions.
If you somehow miss the Skyscraper on 9, a finned X-Wing on 9 r25c68, fin r5c5 will result in r4c6<>9 (=8!).
A Turbot Fish on 9 r2c68 connected in b6 r5c8,r4c9 also results in the same elimination and placement.

cheers to all...immp
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Fri May 04, 2018 4:14 pm    Post subject: Reply with quote
Hi everyone






Gianni wrote:

Code:
Code:

+-------------+-------------+-----------+
| 2378 9 2378 | 4  13  137  | 23  5  6  |
| 236  1 236  | 5  8   369  | 4   29 7  |
| 367  5 4    | 2  369 3679 | 39  8  1  |
+-------------+-------------+-----------+
| 28   7 1    | 69 4   5689 | 56  3  29 |
| 5    6 28   | 3  19  189  | 7   29 4  |
| 4    3 9    | 7  2   56   | 56  1  8  |
+-------------+-------------+-----------+
| 1369 2 36   | 8  369 4    | 19  7  5  |
| 39   4 5    | 1  7   239  | 8   6  29 |
| 1679 8 67   | 69 5   269  | 129 4  3  |
+-------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

UR with 5,6 in r46c67 and -5 -6 in r4c6



This scheme allows me to re-propose a discourse that I think has already been addressed other times on the use of methods related to uniqueness. I think that the methods of solving a scheme are of two types.The first, in addition to proposing the solution, they demonstrate the uniqueness and the second ones simply search for a solution and are not interested in demonstrating uniqueness (all backdoors and all UR methods, Avoidable rectangle, hidden rectangle, Bug + 1 and others).
This scheme has 29 Backdoors. Example R4C1 = 2.


Ciao a Tutti
Paolo
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