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Sep 7 VH

 
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
PostPosted: Wed Sep 06, 2017 10:16 pm    Post subject: Sep 7 VH Reply with quote
Hi everyone,

Code:

+--------+-----------+----------+
| 8 4  7 | 39  2  59 | 1   6 35 |
| 6 12 3 | 7   8  15 | 25  4 9  |
| 9 12 5 | 134 34 6  | 7   8 23 |
+--------+-----------+----------+
| 2 3  9 | 8   6  7  | 4   5 1  |
| 5 7  4 | 139 39 19 | 8   2 6  |
| 1 8  6 | 45  45 2  | 3   9 7  |
+--------+-----------+----------+
| 3 69 1 | 2   59 8  | 56  7 4  |
| 4 5  2 | 6   7  3  | 9   1 8  |
| 7 69 8 | 59  1  4  | 256 3 25 |
+--------+-----------+----------+

Play this puzzle online at the Daily Sudoku site

Quote:
W-Wing 3,9 in r1c4,r5c5 connected by number 9 in r15c6 and -3 in r3c5,r5c4
or
W-Wing 5,9 in r1c6,r9c4 connected by number 5 in r19c9 and -9 in r1c4
or
XY-Wing 3,5,9 in r1c49,r9c4 and -5 in r9c9


Ciao Gianni
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Sep 07, 2017 5:02 am    Post subject: Reply with quote
I went with the 59 W-Wing.
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Ajò Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
PostPosted: Thu Sep 07, 2017 1:10 pm    Post subject: Reply with quote
Hi everyone

Other possible solutions

AIC (3=2)R3C9-(2=5)R9C9-(5=9)R9C4-(9=3)R1C4-(3)R1C9=>-3R1C9=>stte
or
AIC (5)R2C7=(5)R2C7-(5)R7C7=(5)R7C5-(5=9)R9C4-(9)R1C4=(9-5)R1C6=>-5R1C6=>stte (biunivocal correspondence with -9R1C4)
or
AIC (9)R7C5=(9)R9C4-(9=3)R1C4-(3)R3C5=(3-9)R5C5=>-9R5C5=>stte
or
AIC (5)R6C5=(5-9)R7C5=(9)R9C4-(9=3)R1C4-(3=4)R3C5-(4)R3C4=(4-5)R6C4=>-5R6C4=>stte (biunivocal correspondence with -4R6C5, -5R7C5, -9R7C2 , -6R7C7 and -6R9C2)
or
[(2)R9C7-(2=5)R2C7-(5=1)R2C6-(1)R5C6 and (2)R9C7-(2=5)R9C9-(5=9)R9C4-(9)R7C5=(9)R5C5-(9)R5C6=>contradiction R5C6=Ø=>-2R9C7=>stte (biunivocal correspondence with -5R9C9).
Ciao a Tutti
Paolo
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