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Jul 18 VH

dailysudoku.com Forum Index -> Daily Sudoku puzzles

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Clement

Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

Posted: Tue Jul 17, 2012 10:37 pm Post subject: Jul 18 VH

After the Basics

Code:

+------------+-----------+--------+
| 58 3 58 | 9 26 26 | 1 7 4 |
| 7 2 9 | 4 8 1 | 5 3 6 |
| 4 1 6 | 5 7 3 | 8 2 9 |
+------------+-----------+--------+
| 6 58 258 | 3 25 7 | 9 4 1 |
| 1 4 3 | 6 9 8 | 2 5 7 |
| *25 9 7 | 1 245 #24 | 3 6 8 |
+------------+-----------+--------+
| 2-58 58 2458 | 7 1 *45 | 6 9 3 |
| 9 67 45 | 8 3 456 | 47 1 2 |
| 3 67 1 | 2 46 9 | 47 8 5 |
+------------+-----------+--------+

I used two XY-Wings
XY-Wing 245 pivoted in r6c6; r7c1<>5 opens another
XY-Wing 258 pivoted in r7c1; r4c2<>5.

arkietech

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

Posted: Wed Jul 18, 2012 10:54 am Post subject:

Code:

*-----------------------------------------------------------*
| 58 3 *58 | 9 26 26 | 1 7 4 |
| 7 2 9 | 4 8 1 | 5 3 6 |
| 4 1 6 | 5 7 3 | 8 2 9 |
|-------------------+-------------------+-------------------|
| 6 #58 #258 | 3 25 7 | 9 4 1 |
| 1 4 3 | 6 9 8 | 2 5 7 |
| 25 9 7 | 1 245 24 | 3 6 8 |
|-------------------+-------------------+-------------------|
| 258 *58 248-5 | 7 1 45 | 6 9 3 |
| 9 67 4-5 | 8 3 456 | 47 1 2 |
| 3 67 1 | 2 46 9 | 47 8 5 |
*-----------------------------------------------------------*
w-wing
(5=8)r1c3-r4c3=r4c2-(8=5)r7c2 => -5r78c3

if r1c3 is not 5 then r7c2 is 5

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