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Earl
Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
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 Posted: Sun Mar 15, 2009 3:38 am Post subject: March 15 VH |
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One shot. (389) xy-wing.
Early Earl |
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swando
Joined: 09 Mar 2009
Posts: 17
Location: Surrey, BC. Canada
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| Posted: Sun Mar 15, 2009 9:48 am Post subject: |
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| 389 it was! |
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cgordon
Joined: 04 May 2007
Posts: 769
Location: ontario, canada
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| Posted: Sun Mar 15, 2009 1:31 pm Post subject: |
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| I don't like looking for xy wings - too painful. So for me it was an x-wing on <3>: two Type 4 URs (15) and (49) and another x-wing on <9>. |
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Clement
Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
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| Posted: Sun Mar 15, 2009 1:33 pm Post subject: |
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I used two XY-Wings:-
1) XY-Wing {359} with Pivot {5,3}r5c5 eliminating 9 in r8c2
2) XY-Wing {389} with Pivot {3,8}r5c3 eliminating 9 in r7c2 solves the puzzle. However, the 389 XY-wing was enough. |
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Louise56
Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA
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| Posted: Tue Mar 24, 2009 2:46 pm Post subject: 15 March VH XY wing |
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| Could someone explain to me the 389 XY wing in this puzzle? I understand the XY wing when it is a rectangle, but this one appears not to be. I couldn't solve the puzzle. Thanks! |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Tue Mar 24, 2009 3:06 pm Post subject: Re: 15 March VH XY wing |
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| Louise56 wrote: | | Could someone explain to me the 389 XY wing in this puzzle? I understand the XY wing when it is a rectangle, but this one appears not to be. I couldn't solve the puzzle. Thanks! |
The cell marked with "@" can only be a 3 or an 8.
That means that one of the cells marked with a "#" must be a 9.
All the cells marked with a "/" cannot be a 9 because they "see" both 9s. 
| Code: | .---------------------.---------------------.---------------------.
| 489 5 389 | 3489 2 3489 | 1 6 7 |
| 4789 389 1 | 34789 39 6 | 34 2 5 |
| 47 6 2 | 3457 1 3457 | 34 8 9 |
:---------------------+---------------------+---------------------:
| 5 2 /4 | 89 7 89 | 6 3 1 |
| 19 #39 /6 | 135 35 2 | 8 7 4 |
| 18 7 @38 | 6 4 13 | 5 9 2 |
:---------------------+---------------------+---------------------:
| 3 /49 7 | 1459 8 1459 | 2 15 6 |
| 6 /489 #89 | 2 59 1459 | 7 15 3 |
| 2 /1 5 | 37 6 37 | 9 4 8 |
'---------------------'---------------------'---------------------' |
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Louise56
Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA
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| Posted: Tue Mar 24, 2009 5:15 pm Post subject: |
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| Thank-you Wapati for a great explanation. I have always had a mental block with y wings. It's hard to locate them, but your logic is clear and simple. |
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wapati
Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
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| Posted: Tue Mar 24, 2009 5:16 pm Post subject: |
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