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does anyone has an idea? (Moved to Other Puzzles)
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moshero3



Joined: 11 Feb 2012
Posts: 12

PostPosted: Tue Feb 14, 2012 6:29 am    Post subject: does anyone has an idea? (Moved to Other Puzzles) Reply with quote

Code:

+---------------+----------------+--------------+
| 3    9    4   | 2    568  7    | 568 1    568 |
| 56   8    1   | 9    3456 3456 | 56  7    2   |
| 567  567  2   | 168  1568 56   | 4   3    9   |
+---------------+----------------+--------------+
| 2578 257  57  | 468  9    246  | 3   2456 1   |
| 28   3    9   | 5    468  1    | 268 246  7   |
| 4    1    6   | 38   7    23   | 9   25   58  |
+---------------+----------------+--------------+
| 9    2567 8   | 3467 3456 3456 | 1   256  356 |
| 1    4    35  | 36   2    8    | 7   9    356 |
| 2567 2567 357 | 1367 1356 9    | 256 8    4   |
+---------------+----------------+--------------+

[url=
http://www.dailysudoku.com/sudoku/play.shtml?p=3:9:4:2:568:7:568:1:568:56:8:1:9:3456:3456:56:7:2:567:567:2:168:1568:56:4:3:9:2578:257:57:468:9:246:3:2456:1:28:3:9:5:468:1:268:246:7:4:1:6:38:7:23:9:25:58:9:2567:8:3467:3456:3456:1:256:356:1:4:35:36:2:8:7:9:356:2567:2567:357:1367:1356:9:256:8:4:
]
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Tue Feb 14, 2012 10:45 am    Post subject: Reply with quote

Look closely at row 2.

There are basic moves left but this puzzle will require a very advanced move to complete.
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Dart45



Joined: 16 Apr 2008
Posts: 17
Location: Canada

PostPosted: Tue Feb 14, 2012 12:42 pm    Post subject: Reply with quote

Hmmm ... require a very advanced move to complete?

For some reason I was able to complete using basics only - and I double checked just to make sure I didn't make any mistakes!

Happy Valentines Day all! Dart
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Dart45



Joined: 16 Apr 2008
Posts: 17
Location: Canada

PostPosted: Tue Feb 14, 2012 12:51 pm    Post subject: Reply with quote

Oooops ... Mia Culpa. I just realized that Arkietech and Moshero were not talking about today's puzzle.
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Tue Feb 14, 2012 1:01 pm    Post subject: Reply with quote

Puzzle after basic moves:
Code:
 *-----------------------------------------------------------*
 | 3     9     4     | 2     56    7     | 568   1     568   |
 | 56    8     1     | 9     34    34    | 56    7     2     |
 | 567   567   2     | 18    18    56    | 4     3     9     |
 |-------------------+-------------------+-------------------|
 | 2578  257   57    | 468   9     246   | 3     246   1     |
 | 28    3     9     | 5     468   1     | 268   246   7     |
 | 4     1     6     | 38    7     23    | 9     25    58    |
 |-------------------+-------------------+-------------------|
 | 9     2567  8     | 3467  3456  3456  | 1     256   356   |
 | 1     4     35    | 36    2     8     | 7     9     356   |
 | 2567  2567  357   | 1367  1356  9     | 256   8     4     |
 *-----------------------------------------------------------*
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moshero3



Joined: 11 Feb 2012
Posts: 12

PostPosted: Tue Feb 14, 2012 5:36 pm    Post subject: Reply with quote

dan hi,

saw your remark, it doesn't help solving
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Tue Feb 14, 2012 6:49 pm    Post subject: Reply with quote

Found a long chain but don't like it. Looking at ur's in b258 Confused
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Tue Feb 14, 2012 7:13 pm    Post subject: Reply with quote

What is the source of this puzzle and its rating?
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moshero3



Joined: 11 Feb 2012
Posts: 12

PostPosted: Tue Feb 14, 2012 7:45 pm    Post subject: Reply with quote

The puzzle is from book called "absolutely nasty sudoku - level 4"
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Tue Feb 14, 2012 8:48 pm    Post subject: Reply with quote

moshero3 wrote:
The puzzle is from book called "absolutely nasty sudoku - level 4"

That's funny, I have that same book. I haven't done that many puzzles from it yet, but those I've seen don't live up to the book's title. Having said that, I don't see a solution to this one yet.
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Tue Feb 14, 2012 9:00 pm    Post subject: Reply with quote

It is not pretty --- but works!
Code:
 *-----------------------------------------------------------*
 | 3     9     4     | 2    *56    7     |*568   1    *568   |
 | 56    8     1     | 9     34    34    |f56    7     2     |
 | 567   567   2     | 18    18    56    | 4     3     9     |
 |-------------------+-------------------+-------------------|
 | 2578  257   57    | 468   9     246   | 3    f246   1     |
 | 28    3     9     | 5    *468   1     | 28-6 *246   7     |
 | 4     1     6     | 38    7     23    | 9     25    58    |
 |-------------------+-------------------+-------------------|
 | 9    *2567  8     | 3467 *3456  3456  | 1    *256   356   |
 | 1     4     35    | 36    2     8     | 7     9     356   |
 |*2567 *2567  357   | 1367 *1356  9     | 256   8     4     |
 *-----------------------------------------------------------*
finned franken jellyfish (6)
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moshero3



Joined: 11 Feb 2012
Posts: 12

PostPosted: Tue Feb 14, 2012 9:52 pm    Post subject: are you sure it is a jellyfish? Reply with quote

As far as i know it should be a closed shape, c9r1 steps out.
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JC Van Hay



Joined: 13 Jun 2010
Posts: 372
Location: Charleroi, Belgium

PostPosted: Tue Feb 14, 2012 10:25 pm    Post subject: Reply with quote

3-SIS X Chain : 6r5c5=Kite(6C5R8)-6r1c9=6r12c7 => -6r5c7; NP(28)r5c17, 3 Singles, Pointing(5)R7; stte
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Wed Feb 15, 2012 12:19 am    Post subject: Reply with quote

[Withdrawn: totally wrong on the viewpoint presented!!!]

Last edited by daj95376 on Wed Feb 15, 2012 5:40 am; edited 1 time in total
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ronk



Joined: 07 May 2006
Posts: 397

PostPosted: Wed Feb 15, 2012 2:00 am    Post subject: Reply with quote

daj95376 wrote:
Unfortunately, it involves the "third" way Angus Johnson described using Colors ...
and that way never made it into his solver, Simple Sudoku.

If that's true, then a bug has crept into my program. Actually, the chain you posted doesn't "fit" what I remember for his "third way" either.
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daj95376



Joined: 23 Aug 2008
Posts: 3855

PostPosted: Wed Feb 15, 2012 5:38 am    Post subject: Reply with quote

ronk wrote:
daj95376 wrote:
Unfortunately, it involves the "third" way Angus Johnson described using Colors ...
and that way never made it into his solver, Simple Sudoku.

If that's true, then a bug has crept into my program.

Actually, the chain you posted doesn't "fit" what I remember for his "third way" either.

You are correct. I tripped up in several ways. Sorry!!!
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moshero3



Joined: 11 Feb 2012
Posts: 12

PostPosted: Wed Feb 15, 2012 4:32 pm    Post subject: Reply with quote

does anyone has a simpler solution to this one?
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Wed Feb 15, 2012 4:59 pm    Post subject: Reply with quote

moshero3 wrote:
does anyone has a simpler solution to this one?

Like beauty, "simpler" is in the eye of the beholder. I used Medusa, simple coloring (possibly not needed) and an external analysis of the 34 UR. Definitely simpler for me, as I don't understand all the Franken stuff.
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SudoQ



Joined: 02 Aug 2011
Posts: 127

PostPosted: Wed Feb 15, 2012 5:28 pm    Post subject: Reply with quote

moshero3 wrote:
does anyone has a simpler solution to this one?

Code:
r1c5 or r3c6 = 6
r1c5=6 -> r2c7=6, r5c8=6, r4c8=4         -> r4c4<>4   
r3c6=6 -> r7c6=5, r6c8=5, r6c6=2, r4c6=4 -> r4c4<>4

I don't know if this is a simple solution,
but I think it's easy to understand.

/SudoQ
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Luke451



Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California

PostPosted: Wed Feb 15, 2012 7:06 pm    Post subject: Reply with quote

SudoQ wrote:
moshero3 wrote:
does anyone has a simpler solution to this one?

Code:
r1c5 or r3c6 = 6
r1c5=6 -> r2c7=6, r5c8=6, r4c8=4         -> r4c4<>4   
r3c6=6 -> r7c6=5, r6c8=5, r6c6=2, r4c6=4 -> r4c4<>4

I don't know if this is a simple solution,
but I think it's easy to understand.

/SudoQ

Not so easy for me, SudoQ. I can't get either chain to work starting from the position after basics.
Code:
*-----------------------------------------------------------*
 | 3     9     4     | 2     56    7     | 568   1     568   |
 | 56    8     1     | 9     34    34    | 56    7     2     |
 | 567   567   2     | 18    18    56    | 4     3     9     |
 |-------------------+-------------------+-------------------|
 | 2578  257   57    | 468   9     246   | 3     246   1     |
 | 28    3     9     | 5     468   1     | 268   246   7     |
 | 4     1     6     | 38    7     23    | 9     25    58    |
 |-------------------+-------------------+-------------------|
 | 9     2567  8     | 3467  3456  3456  | 1     256   356   |
 | 1     4     35    | 36    2     8     | 7     9     356   |
 | 2567  2567  357   | 1367  1356  9     | 256   8     4     |
 *-----------------------------------------------------------*
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