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nataraj · Posted: Mon Jul 07, 2008 5:51 am Post subject: July 7 V?H

A reasonably well hidden x-wing does it
(x-wing on "7" in cols 3 and 8, removes 7 from r5c1, r8c29)

Or ... could it be ... just basics?

puzzled
Question

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confirm: I did the puzzle again and no advanced techniques are needed.

storm_norm · Joined: 18 Oct 2007 Posts: 1741

maybe the naked triples are suppose to make people scratch their heads??

cgordon · Joined: 04 May 2007 Posts: 769 Location: ontario, canada

I used an x-wing on <7> to finish it off - but now after reading the other posts I'm gonna have to try again. Deja vu from last week eh !
Actually, I did enjoy this one. I thought it had the more difficult basics of a “Hard” puzzle (triples and quads). Often the VH’s are “Easy” ones with a wing thrown in. I'm not convinced this one can be done without a wing. Like Arnold - "I will be back"!

tlanglet · Posted: Mon Jul 07, 2008 12:27 pm Post subject:

It was a "funny" experience for me. I was doing the basics, and doing more basics, when I realized that the puzzle was resolved without any advanced techniques. I assumed that I had made an incorrect but lucky move so I solved it a second time with the same result! What a "bummer" Rolling Eyes

Ted

nataraj · Posted: Mon Jul 07, 2008 12:31 pm Post subject:

Hm, the x-wing is there right from the beginning (well, after the hidden single 5 in r6c3 removes the third "7" in column 3), so it is hard to say when exactly I used it...

But the solution does not depend on a wing:

There are 2 naked quads 1239 row 1 and 1279 col 1.

Soon after a box/line in box 4 restricts 1 to row 5, there is a naked triple 7,8,9 in column 2 takes out 7 in r89c2, which makes r8c3=7 and the x-wing is gone...

cgordon · Joined: 04 May 2007 Posts: 769 Location: ontario, canada

My commitment was to do this like my peers - with no VH steps. My peers were right - no VH bits are needed - but it sure took me a long time to complete. And that was after cheating and looking at Nataraj's last post.
Since I originally completed this very quickly using an x-wing - there has to be a moral there somewhere.

Marty R. · Posted: Mon Jul 07, 2008 3:54 pm Post subject:

Maybe I missed something, as basics didn't do it for me. But two URs took care of it.

nataraj · Posted: Mon Jul 07, 2008 4:13 pm Post subject:

Clement · Posted: Mon Jul 07, 2008 4:26 pm Post subject: Daily Sudoku: Mon 7 Jul-2008 VH

After basic eliminations using triples, quads,lone numbers, box line intersections etc., an X-Wing with candidates of 7's appears in r6c29 and r9c29 elimianatng the 7's in the respective columns solving the puzzle.

keith · Posted: Mon Jul 07, 2008 10:38 pm Post subject:

After placing the <5> in C3, I saw the X-wing on my first scan of the columns. That places <1> in R5C1, and you are done.

Without the X-wing:

Hidden triple <468> in R1B2. Hidden pair <78> in C8. Hidden pair <12> in c2.

keith

cgordon · Joined: 04 May 2007 Posts: 769 Location: ontario, canada

Guys!!! Please acknowledge this puzzle is a HARD only. "Very Hard'" solutions are not worthy.

keith · Posted: Tue Jul 08, 2008 2:04 am Post subject:

nataraj · Posted: Tue Jul 08, 2008 6:46 am Post subject:

cgordon · Joined: 04 May 2007 Posts: 769 Location: ontario, canada

sudocraz · Joined: 28 Apr 2008 Posts: 53

Neither my husband nor I had to do anything except the basics to solve this one. No x-wings or URs, nor even any bug removal. I think it was more like a hard than a very hard.