Sunday times 11/12/05 superior 20

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Sunday times 11/12/05 superior 20

Postby silvercar » Sun Dec 11, 2005 1:14 pm

Anyone help on this one? I've found one X-wing so far.
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Postby Pi » Sun Dec 11, 2005 5:16 pm

is that the X-wing of 7's in collums 1 and 9

i found that but got stuck then
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Postby Bigtone53 » Sun Dec 11, 2005 5:48 pm

Anyone help on this one? I've found one X-wing so far.


I did not consciously use an x-wing on this. My breakthrough was finding a hidden trio in row 8.
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Postby CathyW » Sun Dec 11, 2005 9:35 pm

I had used the x-wing of 7s to make some eliminations but as Bigtone said, the key was the hidden triple in row 8. Took me ages to spot it though.
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Postby Pi » Mon Dec 12, 2005 5:09 pm

I've throughn away my paper, can anyone give me a link to the puzzle?
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Postby alanh » Mon Dec 12, 2005 11:37 pm

Well done everyone for spotting the hidden triple. Well hidden! Imust admit I'd started to tire of Su Doku, thinking I'd got the hang of the very hard ones using X-Wings and triples. But I didn't spot this one!
The Killer in the Times today (12/12/2005) was also more interesting than usual, with having to use the rule of no repeated numbers in a box.
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Sunday Times 11.12.05

Postby boredjane » Mon Dec 12, 2005 11:38 pm

Help! Found the x-wing .. but what hidden trio??? Am I just being dim?
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Postby Crazy Girl » Tue Dec 13, 2005 12:28 am

Jane

The Hidden Trio is in R8 which reads:
Code: Select all
347    367    34567    2569*    1    56    278    2589*    67


So you are looking for 3 numbers (say a, b, c) that only appear in 3 cells, and any other numbers that appear with these 3 numbers (a, b, c) can be deleted.
the 3 numbers do not have to appear in all three cells, although they do each appear at least twice.

Once you have found this you will spot a Naked Pair in a column, using one of the Hidden Trio/Triple cells, that will lead to a Naked Single.

If you need any more help post you candidate grid and we'll try and give you more hints.:)
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Postby digby » Tue Dec 13, 2005 9:07 am

I thought I understood the concept of a triple, but surely that must apply to 3 cells? Here we appear to only have 2569 and 2589. Which is the third cell which allows further eliminations?

Thanks
Digby
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Postby domt » Tue Dec 13, 2005 11:22 am

347 367 34567 2569* 1 56 278 2589* 67


I believe the other star should be after the 278.

Hope this helps

Dom

[/quote]
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re: The Sunday Times #20 ( 2005.Dec.11 )

Postby Pat » Tue Dec 13, 2005 4:55 pm

digby wrote:I thought I understood the concept of a triple, but surely that must apply to 3 cells?
Here we appear to only have 2569 and 2589.
Which is the third cell which allows further eliminations?

Thanks
Digby

the 3 digits { 2,8,9 }
have only 3 cells available in r8.

this settles the 6 for c4.



as Bigtone53 suggested,
the X-wing in this puzzle is just a red herring.


- Pat

The Sunday Times #20 ( 2005.Dec.11 )
User avatar
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Postby digby » Tue Dec 13, 2005 8:33 pm

Thanks. Now I see why it is "hidden". Clever!
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Postby Crazy Girl » Wed Dec 14, 2005 12:16 am

digby wrote:I thought I understood the concept of a triple, but surely that must apply to 3 cells? Here we appear to only have 2569 and 2589. Which is the third cell which allows further eliminations?

Thanks
Digby


Sorry,

I asterixed two of the cells in the triple and left the third for you to work out so you understood the principle, will next time make this clearer.:)
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Re: Sunday times 11/12/05 superior 20

Postby Cec » Wed Dec 14, 2005 2:39 pm

silvercar wrote:Anyone help on this one? I've found one X-wing so far.

Hi silvercar,
This seems an interesting post but suggest submitting the puzzle would make it even more interesting.
Cec
Pi wrote:I've throughn away my paper, can anyone give me a link to the puzzle?

Hi Pi,
You've got me excited!. Here's hoping we will both now get a peek:!:
Cec
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Postby afjt » Wed Dec 14, 2005 3:59 pm

Given that this is listed in "The Times" forum, you could try looking for it on the Times' website..
http://www.timesonline.co.uk/article/0,,18209-1901410,00.html !
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