dailysudoku.com

AThiker · Joined: 01 May 2007 Posts: 6 Location: Taipei

Another oldie

+------------+----------+--------------+
| 78 12 3 | 5 14 28 | 2478 9 6 |
| 6 4 9 | 7 3 28 | 1258 258 128 |
| 578 125 18 | 6 14 9 | 2478 248 3 |
+------------+----------+--------------+
| 1 3 57 | 9 57 4 | 28 6 28 |
| 58 9 68 | 1 2 56 | 3 7 4 |
| 4 67 2 | 8 67 3 | 9 1 5 |
+------------+----------+--------------+
| 3 67 57 | 4 568 1 | 258 258 9 |
| 9 15 4 | 2 58 7 | 6 3 18 |
| 2 8 16 | 3 9 56 | 145 45 7 |
+------------+----------+--------------+

The hint is a 7 in r1 c1, but I do not see it.[/list]

Angel · Joined: 26 Mar 2006 Posts: 31

AThiker · Joined: 01 May 2007 Posts: 6 Location: Taipei

Thanks for the help. For every very hard puzzle I look for those good ol xy wings (and xyz), but sometimes just do not see them.

Still trying to get my grid to line up (see ideas given me on Jan 6 post). Are you saying that you click on code on the post page, then paste the grid? Thx I hate the misaligned grids.

Angel · Joined: 26 Mar 2006 Posts: 31

I'm not sure where you had your grid to start with, but an easy way to get it to look good is to format it in Notepad. Make sure it looks OK there.

Then open the posting page on the forum, copy and paste your grid from Notepad. Don't worry if it doesn't look OK at this point - this is not how it will look when posted. Highlight the grid, then click the code button. This puts code tags at the start and end of your grid. You can check if it's going to work by using the preview button.

This is what I did to your original grid to make it line up better.

Marty R. · Posted: Mon May 07, 2007 3:41 pm Post subject:

pbreinhart · Joined: 21 Sep 2007 Posts: 9 Location: Atlanta, GA

I haven't been able to get to where Angel and ATHiker start even after staring at and thinking about the puzzle for quite awhile. I am here:

Marty R. · Posted: Thu Feb 14, 2008 6:13 am Post subject: Re: pbreinhart

Asellus · Posted: Thu Feb 14, 2008 7:01 am Post subject:

That coloring on <5> is also a Kite. But, even better if you're going for <5>s, you might want to think: Skyscraper.

However, in keeping with the VH idea that only X-, XY- and XYZ-Wings are required, there is an X-Wing in the grid after applying that XYZ-Wing elimination of the <7>. (Hint: It doesn't involve <5>s.) That won't solve the puzzle. But, it opens up an XY-Wing that does.

pbreinhart · Joined: 21 Sep 2007 Posts: 9 Location: Atlanta, GA

Thanks Marty and Asellus. I will do some research on the techniques. I wouldn't have gotten to a solution without the hints.