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Jul 15 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 868
Location: Rimini, Italy

PostPosted: Fri Jul 14, 2017 10:11 pm    Post subject: Jul 15 VH Reply with quote

Hi everyone,

Code:

+------------+---------------+--------------+
| 48  9  246 | 478 2348  1   | 367  5    46 |
| 7   3  1   | 6   5     49  | 8    2    49 |
| 5   28 246 | 478 23489 249 | 3679 39   1  |
+------------+---------------+--------------+
| 13  6  8   | 45  49    459 | 2    139  7  |
| 134 5  34  | 2   6     7   | 139  1389 89 |
| 9   27 27  | 18  18    3   | 4    6    5  |
+------------+---------------+--------------+
| 2   78 57  | 145 14    456 | 169  189  3  |
| 6   1  9   | 3   7     8   | 5    4    2  |
| 38  4  35  | 9   12    256 | 16   7    68 |
+------------+---------------+--------------+

Play this puzzle online at the Daily Sudoku site

I chose this option

Quote:
XY-Wing 4,6,8 in r1c1, r1c9, r9c9 and -8 in r9c1


Ciao Gianni
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Ajò Dimonios



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

PostPosted: Sat Jul 15, 2017 5:56 am    Post subject: Reply with quote

Hi everyone

One step solution.

Forcing chain [(6)R9C9-(6=4)R1C9 and (6-8)R9C9=(8)R9C1-(8=4)R1C1]=>contradiction, two singles 4 in line 1=>-6R9C9=>solution stte.

Ciao a tutti
Paolo
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Ajò Dimonios



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

PostPosted: Sat Jul 15, 2017 2:21 pm    Post subject: Reply with quote

Hi everyone

Another one step solution.
Forcing chain [(2)R1C3-(2=8)R3C2-(8=4)R1C1-(4=6)R1C9 and (2)R1C3-(2=7)R6C3-(7)R7C3=(7-8)R7C2=(8)R9C1-(8=6)R9C9]=>contradiction, two singles 6 in column 9=>-2R1C3=>solution stte.


Ciao a tutti
Paolo
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