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VH091017

 
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arkietech



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

PostPosted: Sun Sep 10, 2017 5:37 am    Post subject: VH091017 Reply with quote

Code:
 *-----------*
 |..6|.74|.1.|
 |.3.|6..|9..|
 |9..|..1|56.|
 |---+---+---|
 |7..|56.|2..|
 |...|.3.|...|
 |..3|.19|..7|
 |---+---+---|
 |.28|1..|..3|
 |..7|..5|.2.|
 |.9.|72.|4..|
 *-----------*


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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 431
Location: Rimini, Italy

PostPosted: Sun Sep 10, 2017 7:48 am    Post subject: Reply with quote

Hi everyone,

Code:

+-----------------+---------+--------------+
| 258   58   6    | 9  7  4 | 3   1   28   |
| 148   3    14   | 6  5  2 | 9   7   48   |
| 9     7    24   | 3  8  1 | 5   6   24   |
+-----------------+---------+--------------+
| 7     14   149  | 5  6  8 | 2   3   19   |
| 12568 1568 1259 | 24 3  7 | 168 459 1569 |
| 2568  568  3    | 24 1  9 | 68  45  7    |
+-----------------+---------+--------------+
| 45    2    8    | 1  49 6 | 7   59  3    |
| 3     146  7    | 8  49 5 | 16  2   169  |
| 156   9    15   | 7  2  3 | 4   8   156  |
+-----------------+---------+--------------+

Play this puzzle online at the Daily Sudoku site

Quote:
XY-Wing 1,4,5 in r29c3,r7c1 and -4 in r2c1


Ciao Gianni
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AjÚ Dimonios



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

PostPosted: Sun Sep 10, 2017 1:22 pm    Post subject: Reply with quote

Hi everyone

[(9-5)R5C3=(5)R9C3-(5=4)R7C1 and (9)R5C3-(9)R5C89=(9)R4C9-(9)R8C9=(9)R7C8-(9=4)R7C5]=>contradiction two singles 4 in line 7=>-9R5C3=>stte.

Ciao a Tutti
Paolo
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AjÚ Dimonios



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

PostPosted: Sun Sep 10, 2017 9:46 pm    Post subject: Reply with quote

Hi everyone

Other solutions

[(1-4)R4C2=(4)R8C2-(4=5)R7C1-(5)R9C3 and (1-4)R4C2=(4)R4C3-(4=1)R2C3-(1)R9C3]=>contradiction R9C3=ō=>-1R4C2=>solution stte.
With the same demostration are valid other solutions biunivocal to each other:
-4R4C3 or -5R5C3 or -4R7C5 or -9R7C8 or -4R8C2 or -9R8C5 or -1R9C3 and -5R9C9.

Ciao a Tutti
Paolo
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immpy



Joined: 06 May 2017
Posts: 252

PostPosted: Mon Sep 11, 2017 12:12 am    Post subject: Reply with quote

Another possible solution...

W-Wing (45) b67, connected by 4. r6c1<>5; r7c8<>5.

Nice puzzle.
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