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A fishing question

 
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keith



Joined: 19 Sep 2005
Posts: 3184
Location: near Detroit, Michigan, USA

PostPosted: Mon Aug 21, 2006 12:42 am    Post subject: A fishing question Reply with quote

This is a Fiendish Sudoku from last week. I'll post it now, I have a question for later.

Code:
Puzzle: FS081706
+-------+-------+-------+
| 1 . . | 2 . . | . . 8 |
| . . . | . 4 . | . 5 . |
| . . 3 | . . 6 | . . . |
+-------+-------+-------+
| 3 . . | 7 . . | 4 . . |
| . 5 . | . 1 . | . 9 . |
| . . 6 | . . 2 | . . 5 |
+-------+-------+-------+
| . . . | 4 . . | 9 . . |
| . 1 . | . 9 . | . . . |
| 5 . . | . . 7 | . . 2 |
+-------+-------+-------+

Keith


Last edited by keith on Tue Aug 22, 2006 12:10 am; edited 1 time in total
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Marty R.



Joined: 12 Feb 2006
Posts: 5178
Location: Rochester, NY, USA

PostPosted: Mon Aug 21, 2006 10:00 pm    Post subject: Reply with quote

First, this is a pretty puzzle with those parallel diagonal lines. Laughing

This puzzle moved along pretty smoothly. Somewhere early, there were two Type 3 rectangles with the ab-ab part in common, which you probably could have done something with, but I didn't try.

An XY-Wing, followed by an X-Wing, did the trick. There was a Type 4, which soon turned into a Type 1, but wasn't needed because basic moves were still available.

I'll be interested to see what sort of fishy discussion ensues.
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David Bryant



Joined: 29 Jul 2005
Posts: 559
Location: Denver, Colorado

PostPosted: Mon Aug 21, 2006 10:53 pm    Post subject: Found 1 X-Wing Reply with quote

I didn't need to rely on any "UR"s, or on the XY-Wing -- one X-Wing (on "9"s) was enough to crack it. dcb
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Marty R.



Joined: 12 Feb 2006
Posts: 5178
Location: Rochester, NY, USA

PostPosted: Tue Aug 22, 2006 12:03 am    Post subject: Re: Found 1 X-Wing Reply with quote

David Bryant wrote:
I didn't need to rely on any "UR"s, or on the XY-Wing -- one X-Wing (on "9"s) was enough to crack it. dcb

I have no idea if I needed to rely on the XY-Wing. It seems that the techniques used to solve puzzles are a result of, in large part, the sequence in which we look for them. Often I just plain forget to look for XY-Wings, but that was not the case here, so I used it when I found it.

This was followed by the same X-Wing you used on "9" and, chances are, had I not found or used the XY-Wing, the X-Wing would have solved it for me too.
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skmoejoe



Joined: 26 Oct 2005
Posts: 4

PostPosted: Tue Aug 22, 2006 5:39 pm    Post subject: Reply with quote

I've been playing with the super hard puzzles at the brainbashers.com website and found this an interesting puzzle. WIth all the 9's present after several reductions, the x wing was a bit difficult to spot, but it fell apart right away.
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