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Friday 5th May Another X-Wing

 
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George Woods



Joined: 28 Mar 2006
Posts: 232
Location: Dorset UK

PostPosted: Fri May 05, 2006 8:59 am    Post subject: Friday 5th May Another X-Wing Reply with quote

Following the previous "First" time for Daily Sudoku, that an "advanced" logic - i.e an X-Wing was needed, I find that an X-Wing is probably needed again.

After 17 entries, I noticed the X wing in 7 and so put a 5 into r5c9 etc...

Intreagued I went to draw, asked for "Today", put in my 17 entries, and asked for a hint YES it came up with the same 5 so it looks as if X-Wings are going to be a regular feature in the "Very Hard" puzzles!
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SL
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PostPosted: Fri May 05, 2006 11:32 am    Post subject: Reply with quote

George,
Thanks for your tips, I got the X-wing of 7 from r1c5, r1c9, r7c5 and r7c9.

The very hard level become harder and harder, so funny and should be kept it on~
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RogerC



Joined: 08 Oct 2005
Posts: 14
Location: High Wycombe, Bucks, England

PostPosted: Fri May 05, 2006 12:40 pm    Post subject: Reply with quote

Sorry, guys, but I just can't agree! Having learned about the X-Wing from the discussion earlier this week, I was looking forward to using it. So I was a bit disappointed to finish this 'Very Hard' puzzle with no advanced techniques whatsoever. Maybe you solved it with an X-Wing, but, believe me, it wasn't necessary.

I would rate the puzzle as 'medium'

Roger
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Fri May 05, 2006 12:48 pm    Post subject: Reply with quote

No easier solution to find (RogerC, i suppose you made a lucky mistake, please refer to the grid below to tell, how you could continue).

Here is a more complicated solution :)

When you noticed the hidden 59-pair in column 7, which leaves a 67-pair in r29c7, there is another x-wing for 7 (this time in columns) with column 4 (r29c4). This one kills the 7 for r2c8 and r9c8, so that only r5c8 can be 7 in column 8.
Code:
-----------------------
 4 6 . | 8 . 9 | 3 5 .
 9 . . | X . . | X . .
 . 7 3 | . . . | 2 . 9
-----------------------
 2 9 8 | 4 5 7 | 1 6 3
 3 4 6 | 2 1 8 | . . .
 7 1 5 | 6 9 3 | 4 2 8
-----------------------
 1 . 4 | 9 . . | 8 3 .
 . . 7 | . . . | . . .
 . 3 9 | X . 5 | X . 2
-----------------------
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bombadil



Joined: 05 May 2006
Posts: 1

PostPosted: Fri May 05, 2006 1:57 pm    Post subject: Reply with quote

RogerC wrote:
Sorry, guys, but I just can't agree! Having learned about the X-Wing from the discussion earlier this week, I was looking forward to using it. So I was a bit disappointed to finish this 'Very Hard' puzzle with no advanced techniques whatsoever. Maybe you solved it with an X-Wing, but, believe me, it wasn't necessary.

I would rate the puzzle as 'medium'

Roger


Indeed, I agree. This puzzle took maybe 20 minutes for me, and I consider myself a novice Sudokuian. There was a period of time I remember being very confused about what to do next, but i saw it eventually. Maybe it was luck. :)

I wish I had kept track of the sequence I took to solve, as maybe I unknowingly used this X-Wing thing after all Smile
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eddieg



Joined: 12 Jan 2006
Posts: 47
Location: San Diego, CA USA

PostPosted: Fri May 05, 2006 3:54 pm    Post subject: Soved via X-Wing Reply with quote

The only way I solved this was by the comments above explaining the X-Wing.

Thanks. I learned something new today.
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Mr. G
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PostPosted: Fri May 05, 2006 11:08 pm    Post subject: im noob Reply with quote

Hi. Im really new to sudoku (first time I try it Very Happy ) and I made what was supposed to be "very hard" without any technique (took me about 2 hours)... I'll check now what's that about an X-Wing
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