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VH101017

 
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Mon Oct 09, 2017 11:25 pm    Post subject: VH101017 Reply with quote

Code:
 *-----------*
 |.6.|3..|.5.|
 |7..|.41|2..|
 |...|.6.|4.9|
 |---+---+---|
 |518|...|...|
 |.7.|...|.1.|
 |...|...|645|
 |---+---+---|
 |2.7|.1.|...|
 |..6|89.|..2|
 |.3.|..2|.6.|
 *-----------*


The solver shows this as "too hard" I think it should be very hard. what do you think?

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Marty R.



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

PostPosted: Tue Oct 10, 2017 1:24 am    Post subject: Reply with quote

Quote:
The solver shows this as "too hard" I think it should be very hard. what do you think?


Dan,

Your solver thinks it's too hard for what? I don't know if it's a very hard by Sam's standard. I didn't notice any XY- or XYZ-Wings, but I didn't check for X-Wings.

Code:

+------------+------------+------------+
| 4  6   29  | 3   28 89  | 7   5  1   |
| 7  589 359 | 59  4  1   | 2   38 6   |
| 38 25  1   | 257 6  57  | 4   38 9   |
+------------+------------+------------+
| 5  1   8   | 46  3  46  | 9   2  7   |
| 6  7   4   | 259 25 59  | 38  1  38  |
| 39 29  239 | 1   78 78  | 6   4  5   |
+------------+------------+------------+
| 2  458 7   | 456 1  346 | 358 9  348 |
| 1  45  6   | 8   9  34  | 35  7  2   |
| 89 3   59  | 457 57 2   | 1   6  48  |
+------------+------------+------------+

Play this puzzle online at the Daily Sudoku site

(5=9)r9c3-(9=8)r9c1-(8=452)r378c2-r3c4=r1c5-(2=5)r5c5=> -5r9c5
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Tue Oct 10, 2017 6:04 am    Post subject: Reply with quote

My solver says there is an xy wing 295r19c3,r3c2 resulting in -5r78c2; ste

The solver on this site says it is "too hard".

Confused

Can you explain?
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Tue Oct 10, 2017 7:15 am    Post subject: Reply with quote

Hi everyone,

Code:

+------------+------------+------------+
| 4  6   29  | 3   28 89  | 7   5  1   |
| 7  589 359 | 59  4  1   | 2   38 6   |
| 38 25  1   | 257 6  57  | 4   38 9   |
+------------+------------+------------+
| 5  1   8   | 46  3  46  | 9   2  7   |
| 6  7   4   | 259 25 59  | 38  1  38  |
| 39 29  239 | 1   78 78  | 6   4  5   |
+------------+------------+------------+
| 2  458 7   | 456 1  346 | 358 9  348 |
| 1  45  6   | 8   9  34  | 35  7  2   |
| 89 3   59  | 457 57 2   | 1   6  48  |
+------------+------------+------------+

Play this puzzle online at the Daily Sudoku site

Quote:
W-Wing 5,9 in r2c4,r9c3 connected by number 9 in r1c36 and -5 in r2c3,r9c4
or
XY-Wing 2,5,9 in r19c3,r3c2 and -5 in r2c3,r78c2
or
Empty Rectangle with number 5 in sector 8 (r78c56) r9c4-r9c3-r2c3 and -5 in r2c4


Ciao Gianni
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Tue Oct 10, 2017 7:25 am    Post subject: Reply with quote

Hi guys,

I read that you use solver.
Could you tell me the name of a good solver for practice?
They only solve the patterns or even create them?

Thank you Gianni
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Tue Oct 10, 2017 7:35 am    Post subject: Reply with quote

Perhaps the scheme is classified very hard because it involves the application of various basic techniques (naked pair / triple), but at the end requires only one higher level technique.
I've read that some programs classify schemes based on the number of techniques to use to solve them, and also based on a payoff that is given by the programmer to each single technique and this leads to very subjective evaluations.
But, at the end, I'm not very knowledgeable about this.

Ciao Gianni
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Tue Oct 10, 2017 10:14 am    Post subject: Reply with quote

Hi everyone

Code:

+------------+-------------+------------+
| 4  6   29  | 3   28 89   | 7   5  1   |
| 7  589 359 | 59  4  1    | 2   38 6   |
| 38 25  1   | 257 6  57   | 4   38 9   |
+------------+-------------+------------+
| 5  1   8   | 46  3  46   | 9   2  7   |
| 6  7   4   | 259 25 59   | 38  1  38  |
| 39 29  239 | 1   78 78   | 6   4  5   |
+------------+-------------+------------+
| 2  458 7   | 456 1  3456 | 358 9  348 |
| 1  45  6   | 8   9  345  | 35  7  2   |
| 89 3   59  | 457 57 2    | 1   6  48  |
+------------+-------------+------------+

Play this puzzle online at the Daily Sudoku site

[(5-9)R2C4=(9)R1C6-(9)R5C6 and (5)R2C4-(5)R3C46=(5)R3C2-(5)R78C2=(5)R9C3-(5)R9C5=(5)R5C5-(5)R5C6]=>contradiction R5C6=ō=>-5R2C4=>stte.

Ciao a Tutti
Paolo
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AjÚ Dimonios



Joined: 01 May 2017
Posts: 339
Location: Sassari Italy

PostPosted: Tue Oct 10, 2017 11:19 am    Post subject: Reply with quote

Ciao Gianni



Gianni Wrote:
Quote:

I read that you use solver.
Could you tell me the name of a good solver for practice?
They only solve the patterns or even create them?


Ciao Gianni

I generally prefer to do the puzzles with special forcing chains created by me. However, I know a Solver "HoDoKu" which creates sudoku puzzles in five levels of difficulty, with a solver and an analyzer. you can download it for free from the internet.
https://www.techsupportalert.com/content/hodoku.htm-0

As for the classification of the difficulty on Robert MauriŤs's site

http://www.assistant-sudoku.com/

you find in the "Niveaux de difficulte" point a very clear description of the classifications of the traditional difficulties and confronting them with the new classification of the "Technique des pistes".

Ciao a Tutti
Paolo
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ZeroAssoluto



Joined: 05 Feb 2017
Posts: 525
Location: Rimini, Italy

PostPosted: Tue Oct 10, 2017 12:21 pm    Post subject: Reply with quote

Thanks Paolo, I take a look
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Marty R.



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

PostPosted: Tue Oct 10, 2017 4:03 pm    Post subject: Reply with quote

Quote:

My solver says there is an xy wing 295r19c3,r3c2 resulting in -5r78c2; ste


How shocking, a move that was there for the taking and I failed to spot it. Laughing
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