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April 12 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Apr 12, 2017 5:10 am    Post subject: April 12 VH Reply with quote
Code:

+--------+----------+---------+
| 9 2 8  | 6 7   3  | 4  5 1  |
| 6 1 4  | 9 5   2  | 78 3 78 |
| 5 3 7  | 8 1   4  | 2  6 9  |
+--------+----------+---------+
| 7 9 3  | 1 2   68 | 5  4 68 |
| 4 6 1  | 5 38  7  | 38 9 2  |
| 2 8 5  | 4 39  69 | 1  7 36 |
+--------+----------+---------+
| 8 7 69 | 2 49  5  | 36 1 34 |
| 1 5 69 | 3 489 89 | 67 2 47 |
| 3 4 2  | 7 6   1  | 9  8 5  |
+--------+----------+---------+

Play this puzzle online at the Daily Sudoku site
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 1019
Location: Rimini, Italy
PostPosted: Wed Apr 12, 2017 7:15 am    Post subject: Reply with quote
Hi everyone,
some possible solutions

Quote:
XY-Wing r6c5, r7c5, r7c9.
XY-Chain with number 8 in r2c7, r8c7, r8c3, r8c6, r4c6, r4c9.
BUG+1 in r8c5 = 9.


Ciao Gianni
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Clement



Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
PostPosted: Wed Apr 12, 2017 12:56 pm    Post subject: Reply with quote
ZeroAssoluto wrote:
Hi everyone,
some possible solutions

Quote:
XY-Wing r6c5, r7c5, r7c9.
XY-Chain with number 8 in r2c7, r8c7, r8c3, r8c6, r4c6, r4c9.
BUG+1 in r8c5 = 9.


Ciao Gianni
ZeroAssoluto becomes more clear if written in Eureka Notation to show what is happening in each cell:
(8=7)r2c7 - (7=6)r8c7 - (6=9)r8c3 - (9=8)r8c6 - (8=6)r4c6 - (6=8)r4c9 => - 8 r2c9; stte
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Clement



Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
PostPosted: Wed Apr 12, 2017 1:03 pm    Post subject: Apr 12 VH Reply with quote
Another one:
(3=4)r567c5 - r7c9 = (4-7)r8c9 = r8c7 - (7=8)r2c7 => - 8 r5c7; stte
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Wed Apr 12, 2017 1:45 pm    Post subject: April 12 VH Reply with quote
xy wing 349@R7C5, -3R6C9

Early Earl
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