dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

VH tarek (2007.Dec.23)

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Mon Dec 10, 2012 10:18 am    Post subject: VH tarek (2007.Dec.23) Reply with quote


    6....39....4.5.....8.2....7..5.....2.9.....6.3.....1..1....9.4.....1.3....25....8

    [ play ]

      22 cells given
Code:


 6 . . | . . 3 | 9 . .
 . . 4 | . 5 . | . . .
 . 8 . | 2 . . | . . 7
-------+-------+------
 . . 5 | . . . | . . 2
 . 9 . | . . . | . 6 .
 3 . . | . . . | 1 . .
-------+-------+------
 1 . . | . . 9 | . 4 .
 . . . | . 1 . | 3 . .
 . . 2 | 5 . . | . . 8

Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3150
Location: near Detroit, Michigan, USA

PostPosted: Mon Dec 10, 2012 7:54 pm    Post subject: Reply with quote

I could not find anything simpler than an X-wing and then a UR or another fish.

Keith
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5124
Location: Rochester, NY, USA

PostPosted: Tue Dec 11, 2012 5:51 am    Post subject: Reply with quote

Code:

+-------------+----------------+--------------+
| 6    27  1  | 478 478   3    | 9   258  45  |
| 27   3   4  | 9   5     678  | 268 28   1   |
| 5    8   9  | 2   46    1    | 46  3    7   |
+-------------+----------------+--------------+
| 478  1   5  | 3   46789 678  | 48  789  2   |
| 2478 9   78 | 1   2478  2578 | 458 6    3   |
| 3    247 6  | 478 24789 2578 | 1   5789 459 |
+-------------+----------------+--------------+
| 1    57  3  | 678 278   9    | 25  4    56  |
| 478  457 78 | 67  1     27   | 3   259  569 |
| 9    6   2  | 5   3     4    | 7   1    8   |
+-------------+----------------+--------------+

Play this puzzle online at the Daily Sudoku site

Probably same as Keith. X-Wing on 4 in c49 followed by a Type 2 UR in boxes 28, 78-78-478-478.
Back to top
View user's profile Send private message
Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Wed Dec 12, 2012 8:26 am    Post subject: Reply with quote


    keith wrote:
    Please post puzzles that "require" a swordfish.
    We'll see what other solution paths there are.
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3150
Location: near Detroit, Michigan, USA

PostPosted: Wed Dec 12, 2012 8:40 am    Post subject: Reply with quote

Pat wrote:

    keith wrote:
    Please post puzzles that "require" a swordfish.
    We'll see what other solution paths there are.

This one can be done by an X-wing and a UR, or by an X-wing and an XY-wing.

I do not see a swordfish that involves fewer steps.

Maybe Pat is ribbing me over my contention that Swordfish are generally not worth looking for. I stand my ground!

Keith
Back to top
View user's profile Send private message
Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Wed Dec 12, 2012 8:46 am    Post subject: Reply with quote

right, not fewer steps

X-wing 4
... Swordfish 8
Back to top
View user's profile Send private message
Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Wed Dec 12, 2012 8:57 am    Post subject: Reply with quote


    you may prefer the 2nd puzzle from tarek's 2007.Dec.23 post

    7....29....8.1.....5.4....6..1.....4.4.....3.2.....5..5....3.9.....7.2....46....1

    [ play ]

      22 cells given
Code:


 7 . . | . . 2 | 9 . .
 . . 8 | . 1 . | . . .
 . 5 . | 4 . . | . . 6
-------+-------+------
 . . 1 | . . . | . . 4
 . 4 . | . . . | . 3 .
 2 . . | . . . | 5 . .
-------+-------+------
 5 . . | . . 3 | . 9 .
 . . . | . 7 . | 2 . .
 . . 4 | 6 . . | . . 1

Back to top
View user's profile Send private message
arkietech



Joined: 31 Jul 2008
Posts: 1709
Location: Northwest Arkansas USA

PostPosted: Wed Dec 12, 2012 9:16 am    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------*
 | 7     1     3     |*58    6     2     | 9     4    *58    |
 | 4     6     8     | 79    1     579   | 37    257   2357  |
 | 9     5     2     | 4     3     78    | 1     78    6     |
 |-------------------+-------------------+-------------------|
 | 368   39-8  1     | 2379  589   5789  | 678   278   4     |
 | 68    4     5     | 279   89    1     | 678   3     279-8 |
 | 2    *389   7     | 39    4     6     | 5     1    *89    |
 |-------------------+-------------------+-------------------|
 | 5     27    6     | 1     28    3     | 4     9     7-8   |
 | 1    *38    9     |*58    7     4     | 2     6    *358   |
 | 38    27    4     | 6     2589  589   | 378   578   1     |
 *-----------------------------------------------------------*
swordfish 8r168c249 => -8r57c9r4c2; stte
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3150
Location: near Detroit, Michigan, USA

PostPosted: Wed Dec 12, 2012 9:25 am    Post subject: Reply with quote

Pat,

I'll look at that one.

But, I am not the anti-swordfish guy! It's akin to the USGA allowing only 14 clubs in your golf bag.

http://www.golflink.com/list_8652_golf-clubs-carry-golf-bag.html

What would you choose? Swordfish and higher fishes are probably not high on my list of must-know techniques.

Keith
Back to top
View user's profile Send private message
Pat



Joined: 23 Feb 2010
Posts: 165

PostPosted: Wed Dec 12, 2012 11:48 am    Post subject: Reply with quote

suppose the puzzles are filtered
and you know you will only need
"basic" moves + X-wing,Swordfish,Jellyfish
in that case, looking for fish may be best

. - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . - . -
the above 2 examples turned out to need just 1 Swordfish;
i have now posted something more exciting
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5124
Location: Rochester, NY, USA

PostPosted: Wed Dec 12, 2012 1:40 pm    Post subject: Reply with quote

Quote:
Maybe Pat is ribbing me over my contention that Swordfish are generally not worth looking for. I stand my ground!


I'm with Keith on this one, as I have been for years. Nothing against Swordfish of course, but I don't think the risk-reward ratio is very good. I'm open to change if someone can tell a paper-and-pencil solver how to look for them efficiently.

There was a recent exception, perhaps on one of Dan's puzzles, where there were two Swordfish, but I think that puzzle had a grid that was less busy than usual, making them relatively easy to spot.
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5124
Location: Rochester, NY, USA

PostPosted: Thu Dec 13, 2012 6:52 pm    Post subject: Reply with quote

Code:

+-----------+----------------+--------------+
| 7   1   3 | 58   6    2    | 9   4   58   |
| 4   6   8 | 79   1    579  | 37  257 2357 |
| 9   5   2 | 4    3    78   | 1   78  6    |
+-----------+----------------+--------------+
| 368 389 1 | 2379 589  5789 | 678 278 4    |
| 68  4   5 | 279  89   1    | 678 3   2789 |
| 2   389 7 | 39   4    6    | 5   1   89   |
+-----------+----------------+--------------+
| 5   27  6 | 1    28   3    | 4   9   78   |
| 1   38  9 | 58   7    4    | 2   6   358  |
| 38  27  4 | 6    2589 589  | 378 578 1    |
+-----------+----------------+--------------+

Play this puzzle online at the Daily Sudoku site

W-Wing 58 boxes 38

(5=8)r1c9-r7c9=r7c5-(8=5)r8c4=>r1c4<>5 leads to here:

Code:

+-----------+-----------+-------------+
| 7   1   3 | 8  6   2  | 9   4  5    |
| 4   6   8 | 9  1   5  | 37  27 237  |
| 9   5   2 | 4  3   7  | 1   8  6    |
+-----------+-----------+-------------+
| 368 389 1 | 27 5   89 | 68  27 4    |
| 68  4   5 | 27 89  1  | 678 3  2789 |
| 2   89  7 | 3  4   6  | 5   1  89   |
+-----------+-----------+-------------+
| 5   27  6 | 1  28  3  | 4   9  78   |
| 1   38  9 | 5  7   4  | 2   6  38   |
| 38  27  4 | 6  289 89 | 378 5  1    |
+-----------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

W-Wing 89 boxes 48

-8r6c2=r4c12-r4c6=r9c6-r7c5=8r7c9=>r6c9<>8
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group