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Oct. 31 VH

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Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Wed Oct 31, 2012 4:42 am Post subject: Oct. 31 VH

Code:

+-----------+------------+---------------+
| 48 1468 3 | 789 5 69 | 2 147 78 |
| 5 18 2 | 3 78 4 | 9 17 6 |
| 7 468 9 | 1 28 26 | 458 3 58 |
+-----------+------------+---------------+
| 3 258 6 | 789 4 29 | 1 57 2578 |
| 48 248 7 | 6 1 5 | 38 9 238 |
| 9 258 1 | 78 278 3 | 578 6 4 |
+-----------+------------+---------------+
| 2 9 4 | 5 3 7 | 6 8 1 |
| 1 37 5 | 4 6 8 | 37 2 9 |
| 6 37 8 | 2 9 1 | 3457 457 357 |
+-----------+------------+---------------+

Play this puzzle online at the Daily Sudoku site

I'm stuck. Oh, I can solve the puzzle, but I can't see any of the standard VH moves, i.e., X-, XY- or XYZ-Wing. There has to be at least one in there unless Sam is playing some kind of Halloween trick. Wink

arkietech

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

Posted: Wed Oct 31, 2012 6:43 am Post subject:

Code:

*-----------------------------------------------------------*
| 4-8 146-8 3 | 789 5 69 | 2 147 a78 |
| 5 c18 2 | 3 78 4 | 9 b17 6 |
| 7 468 9 | 1 28 26 | 458 3 58 |
|-------------------+-------------------+-------------------|
| 3 258 6 | 789 4 29 | 1 57 2578 |
| 48 248 7 | 6 1 5 | 38 9 238 |
| 9 258 1 | 78 278 3 | 578 6 4 |
|-------------------+-------------------+-------------------|
| 2 9 4 | 5 3 7 | 6 8 1 |
| 1 37 5 | 4 6 8 | 37 2 9 |
| 6 37 8 | 2 9 1 | 3457 457 357 |
*-----------------------------------------------------------*
xy-wing
(8=7)r1c9-(7=1)r2c8-(1=8)r2c2 => -8r1c12; stte

George Woods

Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

Posted: Wed Oct 31, 2012 9:36 am Post subject: Is this a perverse solution almost an Xy wing?

r1c8 is either 7 or not. If not than xy wing 148 pivoted in r1c1 makes r2c8 7 Aliter r1c8 is 7 so r1c9 cannot be 7 and this solves it.

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Wed Oct 31, 2012 3:21 pm Post subject:

Quote:

xy-wing
(8=7)r1c9-(7=1)r2c8-(1=8)r2c2 => -8r1c12; stte

ARRRGH!!

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