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stuck on 28 september hard

 
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pkassies



Joined: 30 Sep 2006
Posts: 2
PostPosted: Sat Sep 30, 2006 8:39 pm    Post subject: stuck on 28 september hard Reply with quote
I can solve the puzzle using basic techniques.

Code:

.14 .7. 2..
2.7 1.. .5.
358 426 197

1.. 2.7 ..9
82. 31. .75
7.. 6.. .12

58. 94. 726
.7. ..2 9..
..2 76. 58.


I notice a couple of long chains. On starting in r9c9. If I place a 1 there, it walks all the way to a solution. But I just don't want to guess a number and then walk the puzzle. Is there a logic way out?

I've read about x-wings or y-wings. But can't spot them yet.
Is there one here?

Thanks, Peter
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ravel



Joined: 21 Apr 2006
Posts: 536
PostPosted: Sat Sep 30, 2006 9:19 pm    Post subject: Reply with quote
From your grid you only need the naked pair 13 in box 8/column 6.
Did not see an x-wing either.
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pkassies



Joined: 30 Sep 2006
Posts: 2
PostPosted: Mon Oct 02, 2006 2:15 pm    Post subject: Reply with quote
ah thanks, I was so focussed on difficult solutions, overlooked the obvious.
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