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VH March 12

 
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andras



Joined: 31 Oct 2007
Posts: 56
Location: Mid Wales

PostPosted: Wed Mar 12, 2008 12:39 pm    Post subject: VH March 12 Reply with quote

Another nice one; an x-y on 4,6,9 solved it for me.

John
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sdq_pete



Joined: 30 Apr 2007
Posts: 119
Location: Rotterdam, NL

PostPosted: Wed Mar 12, 2008 12:58 pm    Post subject: Reply with quote

Same here
Peter
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tlanglet



Joined: 17 Oct 2007
Posts: 2468
Location: Northern California Foothills

PostPosted: Wed Mar 12, 2008 1:43 pm    Post subject: Reply with quote

Ditto! Very Happy


Ted
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Earl



Joined: 30 May 2007
Posts: 595
Location: Victoria, KS

PostPosted: Wed Mar 12, 2008 1:52 pm    Post subject: VH Reply with quote

A w-wing (69) sovled it for me.

Earl
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cgordon



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

PostPosted: Wed Mar 12, 2008 2:53 pm    Post subject: Reply with quote

Quote:
Another nice one; an x-y on 4,6,9 solved it for me.


It would solve it for me - if I could find it. Give me a clue - where's the pivot?

I'm actually slower than normal today cos I've been away in Italy for 6 weeks. I didn't bother doing sudokus there - I don't speak Italian.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Mar 12, 2008 3:16 pm    Post subject: Reply with quote

Welcome back Craig.

This is where I found myself after the basics:

Code:

+-----------+--------------+----------+
| 1  9  6   | 2    3  4    | 5  8  7  |
| 48 5  7   | 1689 69 1689 | 46 3  2  |
| 2  34 348 | 68   5  7    | 1  49 69 |
+-----------+--------------+----------+
| 5  1  2   | 4    7  3    | 9  6  8  |
| 48 7  48  | 69   2  69   | 3  1  5  |
| 3  6  9   | 58   1  58   | 7  2  4  |
+-----------+--------------+----------+
| 6  34 5   | 7    8  19   | 2  49 13 |
| 9  2  34  | 156  46 156  | 8  7  13 |
| 7  8  1   | 3    49 2    | 46 5  69 |
+-----------+--------------+----------+

Play this puzzle online at the Daily Sudoku site

This is a good practice puzzle for those who may need to familiarize themselves with some techniques which are commonly discussed here. There are at least two W-Wings on 69, one of which is unproductive. There are at least four XY-Wings involving the 469 combination, two of which involve pincer coloring. There are at least two coloring chains on 4.

Finally, for those who don't use Medusa, but would like to get started, this is also a good one to start with.
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Wed Mar 12, 2008 4:52 pm    Post subject: Reply with quote

I see 2 xy-wings - in the same 4 cells,
2 w-wings 69 with the same pairs - but different strong links,
another w-wing 69 with another cell - linked by the other number,
and a w-wing 46,
that all solve the puzzle.

And an x-wing, that does not solve it.
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cgordon



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

PostPosted: Wed Mar 12, 2008 5:55 pm    Post subject: Reply with quote

Marty: As I mentioned, I'm just back from Italy where the wine is cheap and plentiful. Trouble is - it destroys brain cells. Where is the xy wing for 469 on your grid (not the colouring ones).

Craig
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Clement



Joined: 24 Apr 2006
Posts: 933
Location: Dar es Salaam Tanzania

PostPosted: Wed Mar 12, 2008 6:14 pm    Post subject: Wed 12-Mar-2008 VH Reply with quote

XY-Wing pivot {4,9}r9c5 with pincers {4,6}r9c7 and {6,9}r2c5 eliminating 6 in {4,6}r2c7 solves the puzzle.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Mar 12, 2008 6:27 pm    Post subject: Reply with quote

cgordon wrote:
Marty: As I mentioned, I'm just back from Italy where the wine is cheap and plentiful. Trouble is - it destroys brain cells. Where is the xy wing for 469 on your grid (not the colouring ones).

Craig

Craig, Clement described one of them. There's also one pivoted in r3c5 with pincers in r9c5 and r2c7. The one pivoted in r2c7 with pincers in r2c5 and r3c8 doesn't make any direct eliminations, but either of the pincers on 9 can be colored to take out 9s. Lots of 469s scattered around the grid.
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cgordon



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

PostPosted: Wed Mar 12, 2008 6:45 pm    Post subject: Reply with quote

....seems I missed taking out the 6 in r9c5. I'll be better tomorrow.
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keith



Joined: 19 Sep 2005
Posts: 3340
Location: near Detroit, Michigan, USA

PostPosted: Wed Mar 12, 2008 9:02 pm    Post subject: Reply with quote

cgordon wrote:
I'm actually slower than normal today cos I've been away in Italy for 6 weeks. I didn't bother doing sudokus there - I don't speak Italian.

There's not a web site that translates puzzles from Italian to English?
Razz

Keith
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crunched



Joined: 05 Feb 2008
Posts: 168

PostPosted: Wed Mar 12, 2008 10:32 pm    Post subject: Reply with quote

whoo boy...a sudoku puzzle in Roman...no thanks!!! These puzzles in Arabic are plenty for me.
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Wed Mar 12, 2008 11:23 pm    Post subject: Reply with quote

who was it that asked if xy-chains are dishonorable??

not according to daily sudoku...

ditto on the xy-wing a.k.a. 3 cell xy-chain
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cgordon



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

PostPosted: Wed Mar 12, 2008 11:33 pm    Post subject: Reply with quote

Quote:
whoo boy...a sudoku puzzle in Roman...no thanks!!!


That's interesting. Can you imagine a forum for sudokus in Roman.
"There's an xy wing at IX, VII, IV"
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nataraj



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

PostPosted: Thu Mar 13, 2008 8:04 pm    Post subject: Reply with quote

They had sudoku for sure in Rome,
Horace wrote:

"dulce et decorum est
pro sudoku mori"

Or Mark Anthony:
"friends, Romans, countrymen, lend me your hands!
I want to bury Cesar and get on with today's puzzle"
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Mindwarp



Joined: 13 Sep 2007
Posts: 25
Location: St. Ives, England

PostPosted: Fri Mar 14, 2008 12:33 am    Post subject: Reply with quote

Just imagine the pencil marks in Roman numerals!!! Twisted Evil Confused
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Fri Mar 14, 2008 9:02 pm    Post subject: Reply with quote

Mindwarp wrote:
Just imagine the pencil marks in Roman numerals!!! Twisted Evil Confused



Laughing Laughing Laughing Laughing
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ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Fri Mar 14, 2008 9:47 pm    Post subject: Reply with quote

nataraj wrote:
"dulce et decorum est
pro sudoku mori"
Ave, Sudoku, morituri te salutant Wink
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