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VH082517

 
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Fri Aug 25, 2017 5:25 am    Post subject: VH082517 Reply with quote

Code:
 *-----------*
 |...|...|4.3|
 |.43|..1|5..|
 |7.5|.4.|...|
 |---+---+---|
 |.1.|39.|7..|
 |6..|4.7|..8|
 |..8|.62|.4.|
 |---+---+---|
 |...|.7.|8.4|
 |..7|1..|93.|
 |4.6|...|...|
 *-----------*



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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Fri Aug 25, 2017 8:24 am    Post subject: Reply with quote

Hi everyone
Code:

+----------------+------------+--------------+
| 1289  6    129 | 7   258 59 | 4  289  3    |
| 289   4    3   | 6   28  1  | 5  2789 279  |
| 7     289  5   | 289 4   3  | 6  1289 129  |
+----------------+------------+--------------+
| 25    1    4   | 3   9   8  | 7  6    25   |
| 6     2359 29  | 4   1   7  | 23 259  8    |
| 39    7    8   | 5   6   2  | 13 4    19   |
+----------------+------------+--------------+
| 12359 2359 129 | 29  7   6  | 8  25   4    |
| 258   258  7   | 1   258 4  | 9  3    6    |
| 4     2589 6   | 289 3   59 | 12 1257 1257 |
+----------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

Solution with one step after basics.

AIC (2=5)R4C1-(5)R5C2=(5)R5C8-(5=2)R7C8-(2)R123C8=(2)R23C9-(2)R4C9=>-2R4C9=>solution stte.

Ciao a Tutti
Paolo
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 527
Location: Rimini, Italy

PostPosted: Fri Aug 25, 2017 8:36 am    Post subject: Reply with quote

Hi everyone,

Code:

+----------------+------------+--------------+
| 1289  6    129 | 7   258 59 | 4  289  3    |
| 289   4    3   | 6   28  1  | 5  2789 279  |
| 7     289  5   | 289 4   3  | 6  1289 129  |
+----------------+------------+--------------+
| 25    1    4   | 3   9   8  | 7  6    25   |
| 6     2359 29  | 4   1   7  | 23 259  8    |
| 39    7    8   | 5   6   2  | 13 4    19   |
+----------------+------------+--------------+
| 12359 2359 129 | 29  7   6  | 8  25   4    |
| 258   258  7   | 1   258 4  | 9  3    6    |
| 4     2589 6   | 289 3   59 | 12 1257 1257 |
+----------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

some solutions

XY-Wing 2,3,9 in r6c1, r5c37 and -3 in r5c2, r6c7
or
XY-Wing 2,5,9 in r7c48, r9c6 and -5 in r9c89
or
XYZ-Wing 2,5,9 in r4c9, r5c38 and -2 in r5c7

Ciao Gianni
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Fri Aug 25, 2017 11:19 am    Post subject: Reply with quote

Hi everyone

Other solutions with one step.

[(9)R5C8-(9=2)R5C3 and (9-5)R5C8=(5-2)R4C9=(2)R4C1=>contradiction two singles 2 in box 4=>-9R5C8=>stte.

[(2)R7C8-(2=9)R7C4 and (2-5)R7C8=(5)R9C89-(5=9)R9C6]=>contradiction two singles 9 in box 8=>-2R7C8=>stte.


Ciao a Tutti
Paolo
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Clement



Joined: 24 Apr 2006
Posts: 1027
Location: Dar es Salaam Tanzania

PostPosted: Fri Aug 25, 2017 12:51 pm    Post subject: VH082517 Reply with quote

Code:

+------------------------+--------------------+----------------------+
| 1289      6        129 | 7       258     59 | 4      289      3    |
| 289       4        3   | 6       28      1  | 5      2789     279  |
| 7         289      5   | 289     4       3  | 6      1289     129  |
+------------------------+--------------------+----------------------+
| 25        1        4   | 3       9       8  | 7      6        25   |
| 6         2359    c29  | 4       1       7  |b23    d259      8    |
| 39        7        8   | 5       6       2  |a13     4       e9-1  |
+------------------------+--------------------+----------------------+
| 12359     2359     129 | 29      7       6  | 8      25       4    |
| 258       258      7   | 1       258     4  | 9      3        6    |
| 4         2589     6   | 289     3       59 | 12     1257     1257 |
+------------------------+--------------------+----------------------+

(1=3)r6c7 - (3=2)r5c7 - (2=9)r5c3 - r5c8 = (9)r6c9 => - 1 r6c9; stte
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Fri Aug 25, 2017 2:36 pm    Post subject: Reply with quote

Hi everyone

Some solutions are biunivocal.
R4C9 <>2 with R4C1 <>5
R5C2 <>3 with R5C7 <>2
R5C8 <>9 with R6C9 <>1

Ciao a Tutti

Paolo
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Aug 25, 2017 4:47 pm    Post subject: Reply with quote

I'll add one to Gianni's list:

W-Wing(25)b69, SL 2 in c7=> -5r5c8,r9c9
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Fri Aug 25, 2017 6:37 pm    Post subject: Reply with quote

Hi Marty

Marty wrote:

Quote:
W-Wing(25)b69, SL 2 in c7=> -5r5c8,r9c9



Also R5C8 = 5 and R9C9 = 5 is in biunivoca with R4C9 = 2. This means that the AIC of my previous post and the W-Wing (25) b69, SL2 in c7 have the same logical basis.


Hello to all
Paolo
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Fri Aug 25, 2017 6:48 pm    Post subject: Reply with quote

What does biunivoca mean?
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Fri Aug 25, 2017 7:26 pm    Post subject: Reply with quote

Hi Marty


Biunivoca simply means that when R5C8 = 5 also R4C9 = 2 and when R4C9 = 2 also R5C8 = 5. When this happens if I prove the falsity of R5C8 = 5 I also demonstrated the falseness of R4C9 = 2 and vice versa

Ciao a Tutti

Paolo
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