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 Post subject: Regular Samurai #3
PostPosted: Mon May 12, 2008 6:21 pm 
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All sudoku puzzles in this forum post are the intellectual property of Børge Alexander Tetlie Anderssen.
Copyright © 2008 Børge Alexander Tetlie Anderssen. All rights reserved. Terms of Use.


There are two difficulties to choose from.
Here you can find more information regarding the required solving techniques for each difficulty.
Both puzzles have the same solution.

A) Novice.
B) Apprentice (mainstream edition).



Regular Samurai #3A (Novice)

Rating based on required solving techniques:  Moderate

Image

000000000523000000900005000000090003281700009070002040007060100000070000000000000
000000070060003025000040900010008000300129000009000068008050000000000840000000000
100700008000000000000890000830200009040005070200040100000970000000000000902000007
080000000009000000300700902003000009591002600000060200006007100074500000030080000
000000000000000000007080109000002500508000740009003068001900002600070000000000004



Regular Samurai #3B (Apprentice)

Rating based on required solving techniques:  Barely Hard

Image

000000000523000000900005000000090003281700009070002040007060100000070000000000000
000000070060003025000040900010008000300129000009000068008050000000000840000000000
100700008000000000000890000830200000009005070200040100000970004000000000902000000
080000000009000000300700902003000009591002600000060200006007100074500000030080000
004000000000000000000080109000002500508000740009003068001900002600070000000000004

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Last edited by Børge on Wed May 06, 2009 1:08 pm, edited 5 times in total.

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 Post subject: Re: Regular Samurai #3
PostPosted: Mon May 12, 2008 6:54 pm 
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Posts: 102
Location: Belgium
:? :? :?

Børge wrote:
C) Master (4 Uniqueness Test 1 ..... in an overlapping puzzle )
<snip>
Regular Samurai #3C (Master)

Rating based on required solving techniques: Super Hard

JSudoku wrote:
52 solutions found. This grid is invalid!


Børge wrote:
Regular Samurai #3D (Guru)

Rating based on required solving techniques: Really Ultra Hard

JSudoku wrote:
35 solutions found. This grid is invalid!


Remember you cannot use any uniqueness technique to prove the puzzle has a unique solution, because all these techniques assume a unique solution.

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"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.


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 Post subject: Re: Regular Samurai #3
PostPosted: Mon May 12, 2008 8:13 pm 
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Jean-Christophe wrote:
:? :? :?
Remember you cannot use any uniqueness technique to prove the puzzle has a unique solution, because all these techniques assume a unique solution.


Børge wrote:
C) Master (4 Uniqueness Test 1 ..... in an overlapping puzzle )
<snip>
Regular Samurai #3C (Master)

Rating based on required solving techniques: Super Hard
JSudoku wrote:
52 solutions found. This grid is invalid!
With my sequence of applying the solver techniques JSudoku 1.3b1 says:
The grid is solved!
Techniques used:
184 Naked Singles
78 Hidden Singles
18 Intersections
2 Naked Pairs
1 Naked Triplets
4 Uniqueness Test 1

A BUG IN JSUDOKU :?: :o


Børge wrote:
Regular Samurai #3D (Guru)

Rating based on required solving techniques: Really Ultra Hard
JSudoku wrote:
35 solutions found. This grid is invalid!
With my sequence of applying the solver techniques JSudoku 1.3b1 says:
The grid is solved!
Techniques used:
193 Naked Singles
75 Hidden Singles
28 Intersections
5 Naked Pairs
1 Naked Triplets
2 Naked Quads
1 X-Wing
3 Turbot Fishes
2 Finned X-Wing
2 Uniqueness Test 1
3 XY-Wings
2 Y-Wings
1 XY-Chains
4 XY-X-Chains up to 3 links
3 XY-X-Chains

A BUG IN JSUDOKU :?: :o

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 Post subject: Re: Regular Samurai #3
PostPosted: Mon May 12, 2008 9:15 pm 
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Børge wrote:
Jean-Christophe wrote:
:? :? :?
Remember you cannot use any uniqueness technique to prove the puzzle has a unique solution, because all these techniques assume a unique solution.

<snip>
4 Uniqueness Test 1
<snip>
A BUG IN JSUDOKU :?: :o

Absolutely no bug. You're using UR to prove the unique solution on grids which have multiple solutions, which is non-sense. :naughty: :naughty: :naughty:

It's your job, as a designer, to check for unique solution, using any technique except all uniqueness techniques. The simplest way to go in JSudoku is to Check Grid Validity.

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"When you have eliminated the impossible, whatever remains, however improbable, must be the truth." Sherlock Holmes.


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 Post subject: Re: Regular Samurai #3
PostPosted: Mon May 12, 2008 9:29 pm 
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Jean-Christophe wrote:
Absolutely no bug. You're using UR to prove the unique solution on grids which have multiple solutions, which is non-sense. :naughty: :naughty: :naughty:

It's your job, as a designer, to check for unique solution, using any technique except all uniqueness techniques. The simplest way to go in JSudoku is to Check Grid Validity.
Thanks for the clarification. Absolutely my fault misinterpreting how your solver works.
I have removed RS #3C and #3D and hopefully learned a lesson :study:

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 Post subject: Re: Regular Samurai #3
PostPosted: Tue May 13, 2008 4:27 pm 
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42 mins to complete 3B. I did notice several clues that cascaded to other grids, nice interaction. Thanks for the puzzle!

I think that a uniqueness test could be valid in a samurai, but only if it does not impact any other grid.


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 Post subject: Re: Regular Samurai #3
PostPosted: Thu May 15, 2008 8:38 pm 
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Børge wrote:
Jean-Christophe wrote:
Absolutely no bug. You're using UR to prove the unique solution on grids which have multiple solutions, which is non-sense. :naughty: :naughty: :naughty:

It's your job, as a designer, to check for unique solution, using any technique except all uniqueness techniques. The simplest way to go in JSudoku is to Check Grid Validity.
Thanks for the clarification. Absolutely my fault misinterpreting how your solver works.
I have removed RS #3C and #3D and hopefully learned a lesson :study:

Attachment:
BorgeTeaser.png
BorgeTeaser.png [ 19.46 KiB | Viewed 11254 times ]

:pirate: :cheesey:

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 Post subject: Re: Regular Samurai #3
PostPosted: Thu May 15, 2008 10:25 pm 
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Thanks,

I am looking forward to the next version with this excellent feature for fat-headed puzzle designers.

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