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Jan 28 VH
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LloydB



Joined: 09 Jul 2007
Posts: 21
Location: Skagit Co., WA USA

PostPosted: Tue Jan 29, 2008 11:57 am    Post subject: Reply with quote

Truly a challenging puzzle. Finding the x-wings among the clutter was tough.
An x-wing on 8
An x-wing on 7
An xy-wing on 5,7,8
And finally another xy-wing on 1,4,5 broke it.
Maybe all those weren't necessary.
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Tue Jan 29, 2008 4:17 pm    Post subject: squirrelly grids Reply with quote

marty,

i went back to the last post of 1/24. there are several grids. PRAKASH's grid looks right, all others look squirrely. i know you don't know why, but if anyone does, i'd love to know.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Tue Jan 29, 2008 5:47 pm    Post subject: Reply with quote

sheryl,

I think I know what is going on.

The effect you see comes from the browser trying to wrap the lines. That happens when you either look at this forum through a small browser window (remedy: xx to full screen) or maybe use a large font (use normal size font).

I just tested this effect with Microsoft Internet Explorer. Usually I use Mozilla/Firefox and Mozilla does not show this behaviour but rather hides the rightmost part of the forum when I re-size the window.

You can see prakash's grid allright because it is more condensed.

Hope this helps so you won't see squirrelly puzzles any more. They are bad enough as they are...

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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Jan 29, 2008 7:12 pm    Post subject: Reply with quote

sheryl,
(and anyone who can't fit my grids on the screen)

I make my column width the same regardless of the number of candidates in the cell.

I only do this so I am not changing the size of the grid everytime I post a new one.

if I were to reduce the column width per the number of candidates then some of my grids might be visible in smaller window sizes. or as nataraj pointed out, with larger font.

a higher screen resolution size might help also. you probably won't be able to view my grids in 800 X 600 res. you might get away viewing at 1024 X 768 on a 15" monitor but I haven't tried it.

you will have to set the resolution pretty high so that the entire web page fits on the screen. the catch is that everything will look smaller.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Tue Jan 29, 2008 7:24 pm    Post subject: Reply with quote

if you are really ambitious you could copy my grid and paste it into notepad using "courier" as your font.

although, if you really wanted to get fancy, I would ask nataraj about posting those cool image grids, and any of the images he has posted.
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nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Tue Jan 29, 2008 8:13 pm    Post subject: Reply with quote

Quote:
anyone who can't fit my grids on the screen


Don't be concerned, Norm. It's not just your grids. And 1024x768 seems pretty standard to me. Quite the norm, in fact Laughing

____

edit 2213 GMT: just for the record. I am using a 12'' notebook.
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sheryl



Joined: 24 Sep 2007
Posts: 64
Location: New York

PostPosted: Sun Feb 03, 2008 1:16 am    Post subject: squirrelly grids Reply with quote

well, i do keep my screen on a pretty low resolution because if the resolution is high the images are small and then i can't see them comfortably, so i guess i just won't be able to see some grids. oh well-too bad for me
Crying or Very sad
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Glassman



Joined: 21 Oct 2005
Posts: 50
Location: England

PostPosted: Thu Feb 14, 2008 10:25 am    Post subject: Re: Jan 28 VH Reply with quote

keith wrote:
This may be the toughest "Very Hard" puzzle ever! ...


Although I am not 100% sure that this technique is valid, I have used it several times successfully and can't find anything wrong with the logic, which is identical to that of the x-wing.

There is a triple x-wing on 8s here. Specifically, you will see that all the candidate 8s in the three columns 2, 4, & 7 are confined to the three rows 4, 7, & 8. This allows you to delete stray candidate 8s in these rows, specifically in cells r4c5, r4c9, r7c5, r8c8, & r8c9.

I've not yet finished this puzzle, so apologies if anyone has drawn attention to this earlier in the topic, which, obviously, I've not read.

The "simple" elimination that follows on from this triple x-wing is quite interesting and by no means simple.

Later:- Two linked xy-wings solve it. The single victim of the first, pivot r6c8, is the pivot of the second.

Nice puzzle. Thanks.


Glassman Cool


Last edited by Glassman on Thu Feb 14, 2008 12:20 pm; edited 1 time in total
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Thu Feb 14, 2008 11:50 am    Post subject: Reply with quote

The "triple x-wing" is called swordfish. Its not very popular here, because its hard to spot (at least if you cant highlight single numbers, as i do in my editor). So maybe you like the swordfish puzzle i recently posted here.
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Glassman



Joined: 21 Oct 2005
Posts: 50
Location: England

PostPosted: Thu Feb 14, 2008 1:05 pm    Post subject: Reply with quote

ravel wrote:
The "triple x-wing" is called swordfish. Its not very popular here, because its hard to spot ...


ravel so that's what a swordfish is!!! Thanks for confirming that it's a legitimate technique.

x-wings and swordfish are easier to find if you enter your candidates in the corners of the cells. So, after initial basic elimination, say you have resolved all the 4s and 7s, you have up to seven candidates to fit in the corners. Choose one of the least resolved, say 6, and then use the corners of the cell thus:-

Top left 1 & 2
Top right 3 & 5
Bottom left 6
Bottom right 8 & 9

Well it works for me!

ps I will try your Swordfish puzzle later this week I'm way over my time allocation today.

Glassman Cool
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