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arkietech
Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
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 Posted: Mon Oct 09, 2017 11:25 pm Post subject: VH101017 |
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| Code: | *-----------*
|.6.|3..|.5.|
|7..|.41|2..|
|...|.6.|4.9|
|---+---+---|
|518|...|...|
|.7.|...|.1.|
|...|...|645|
|---+---+---|
|2.7|.1.|...|
|..6|89.|..2|
|.3.|..2|.6.|
*-----------*
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The solver shows this as "too hard" I think it should be very hard. what do you think?
Play/Print this puzzle online |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Oct 10, 2017 1:24 am Post subject: |
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| 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 |
+------------+------------+------------+
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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
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| Posted: Tue Oct 10, 2017 6:04 am Post subject: |
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My solver says there is an xy wing 295r19c3,r3c2 resulting in -5r78c2; ste
The solver on this site says it is "too hard".
Can you explain? |
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ZeroAssoluto
Joined: 05 Feb 2017
Posts: 941
Location: Rimini, Italy
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| Posted: Tue Oct 10, 2017 7:15 am Post subject: |
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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: 941
Location: Rimini, Italy
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| Posted: Tue Oct 10, 2017 7:25 am Post subject: |
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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: 941
Location: Rimini, Italy
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| Posted: Tue Oct 10, 2017 7:35 am Post subject: |
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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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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Tue Oct 10, 2017 10:14 am Post subject: |
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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=Ø=>-5R2C4=>stte.
Ciao a Tutti
Paolo |
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Ajò Dimonios
Joined: 01 May 2017
Posts: 339
Location: Sassari Italy
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| Posted: Tue Oct 10, 2017 11:19 am Post subject: |
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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 Mauriès'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: 941
Location: Rimini, Italy
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| Posted: Tue Oct 10, 2017 12:21 pm Post subject: |
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| Thanks Paolo, I take a look |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Tue Oct 10, 2017 4:03 pm Post subject: |
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| 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.  |
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