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Oct 16 VH

 
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kragzy



Joined: 01 May 2007
Posts: 112
Location: Australia

PostPosted: Thu Oct 15, 2009 10:21 pm    Post subject: Oct 16 VH Reply with quote

For those who like a mathematical approach to single step solutions:

X2 = 1
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Clement



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

PostPosted: Thu Oct 15, 2009 10:34 pm    Post subject: Oct 16 VH Reply with quote

XY-Wing -<78>-<47>-<48> eliminates 8 in r5c1 followed by an X-Wing in 2s Col 2 & Col 8 eliminating 2 in r1c3 solves the puzzle.
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arkietech



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

PostPosted: Fri Oct 16, 2009 6:48 am    Post subject: Re: Oct 16 VH Reply with quote

kragzy wrote:
For those who like a mathematical approach to single step solutions:

X2 = 1

Does that translate x-wing 2 = one step solution?
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iiggoorr



Joined: 06 Aug 2009
Posts: 4

PostPosted: Fri Oct 16, 2009 9:00 am    Post subject: Reply with quote

18-UR in rows 7-8 eliminate 18 in r8c9 and it solves the puzzle
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Fri Oct 16, 2009 12:04 pm    Post subject: Reply with quote

iiggoorr wrote:
18-UR in rows 7-8 eliminate 18 in r8c9 and it solves the puzzle


Hi iiggoorr,

The following is my code after basics:
Code:

 *-----------------------------------------------------------*
 | 1     24    23    | 9     38    5     | 6     248   7     |
 | 246   5     236   | 7     138   18    | 48    9     248   |
 | 7     8     9     | 4     6     2     | 3     1     5     |
 |-------------------+-------------------+-------------------|
 | 3     1     78    | 2     5     47    | 9     468   468   |
 | 248   6     5     | 3     48    9     | 1     7     248   |
 | 9     24    278   | 18    1478  6     | 5     248   3     |
 |-------------------+-------------------+-------------------|
 | 5     7     4     | 6     9     18    | 2     3     18    |
 | 268   9     268   | 18    247   3     | 478   5     1468  |
 | 268   3     1     | 5     247   47    | 478   468   9     |
 *-----------------------------------------------------------*


Given this code, I assume you are referring to the 18 pattern in box89 and row78. If so, that arrangement is not a valid UR pattern. To be valid, the four cells forming the UR must be in two rows, two columns and two boxes. (This forms a rectangle in two boxes.)

A good description of the UR is available at http://www.sudocue.net/guide.php#UR.

Ted
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada

PostPosted: Fri Oct 16, 2009 2:23 pm    Post subject: Reply with quote

Quote:
Does that translate x-wing 2 = one step solution?

Sounds like my one-stepper - x-wing on 2 which I used early on before finishing basics. No worries mate.
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kragzy



Joined: 01 May 2007
Posts: 112
Location: Australia

PostPosted: Mon Oct 19, 2009 9:14 am    Post subject: Re: Oct 16 VH Reply with quote

arkietech wrote:
kragzy wrote:
For those who like a mathematical approach to single step solutions:

X2 = 1

Does that translate x-wing 2 = one step solution?


You got it!
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