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Daily Telegraph Toughie 5/4/06

 
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Korky



Joined: 29 Mar 2006
Posts: 13
Location: Sheffield, UK

PostPosted: Wed Apr 05, 2006 9:29 am    Post subject: Daily Telegraph Toughie 5/4/06 Reply with quote

Can anyone help with this? Draw/Play grades it as "too difficult".
[list=]
71x 62x x38
xxx x73 61x
3x6 xx1 972

6x7 2xx 153
125 367 849
43x x1x 726

861 452 397
x73 196 x8x
9xx 738 x61
[/list]

Difficult puzzles in the DT often require trial and error. Is this one of them?
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keith



Joined: 19 Sep 2005
Posts: 3179
Location: near Detroit, Michigan, USA

PostPosted: Wed Apr 05, 2006 11:00 am    Post subject: T&E Not Required Reply with quote

Look at the placement of the <4>'s in R8 and R9. Then, there are a couple of XY-wings (rooted in the same rows) that solve the puzzle.

Keith
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Korky



Joined: 29 Mar 2006
Posts: 13
Location: Sheffield, UK

PostPosted: Wed Apr 05, 2006 2:12 pm    Post subject: DT Toughie Reply with quote

Thanks for your response, Keith. I'll have to work on this as I've never used xy-wings.
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Korky



Joined: 29 Mar 2006
Posts: 13
Location: Sheffield, UK

PostPosted: Wed Apr 05, 2006 2:42 pm    Post subject: DT Toughie Reply with quote

Done it! The 2/4/5 xy-wing eliminates 4 in r1c3, which makes it a 9. The rest is straightforward.
Thanks again Keith.
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alanr555



Joined: 01 Aug 2005
Posts: 193
Location: Bideford Devon EX39

PostPosted: Fri Apr 07, 2006 10:57 pm    Post subject: Re: Daily Telegraph Toughie 5/4/06 Reply with quote

Code:

> Difficult puzzles in the DT often require trial and error.
> Is this one of them?

They are also noted for having multiple solutions!!!
Thus, they are best avoided - unless one likes such things.

Alan Rayner  BS23 2QT
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