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Regular Samurai #3 http://www.rcbroughton.co.uk/sudoku/forum/viewtopic.php?f=16&t=49	Page 1 of 1

Author:

Børge [ Mon May 12, 2008 6:21 pm ]

Post subject:

Regular Samurai #3

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

000000000523000000900005000000090003281700009070002040007060100000070000000000000
000000070060003025000040900010008000300129000009000068008050000000000840000000000
100700008000000000000890000830200009040005070200040100000970000000000000902000007
080000000009000000300700902003000009591002600000060200006007100074500000030080000
000000000000000000007080109000002500508000740009003068001900002600070000000000004

Regular Samurai #3B (Apprentice)

Rating based on required solving techniques:  Barely Hard

000000000523000000900005000000090003281700009070002040007060100000070000000000000
000000070060003025000040900010008000300129000009000068008050000000000840000000000
100700008000000000000890000830200000009005070200040100000970004000000000902000000
080000000009000000300700902003000009591002600000060200006007100074500000030080000
004000000000000000000080109000002500508000740009003068001900002600070000000000004

Author:	Jean-Christophe [ Mon May 12, 2008 6:54 pm ]
Post subject:	Re: Regular Samurai #3
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.

Author:	Børge [ Mon May 12, 2008 8:13 pm ]
Post subject:	Re: Regular Samurai #3
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 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

Author:	Jean-Christophe [ Mon May 12, 2008 9:15 pm ]
Post subject:	Re: Regular Samurai #3
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 Absolutely no bug. You're using UR to prove the unique solution on grids which have multiple solutions, which is non-sense. 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.

Author:	Børge [ Mon May 12, 2008 9:29 pm ]
Post subject:	Re: Regular Samurai #3
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. 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

Author:	Beemer [ Tue May 13, 2008 4:27 pm ]
Post subject:	Re: Regular Samurai #3
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.

Author:	Jean-Christophe [ Thu May 15, 2008 8:38 pm ]
Post subject:	Re: Regular Samurai #3
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. 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 Attachment: BorgeTeaser.png [ 19.46 KiB \| Viewed 17382 times ]

Author:	Børge [ Thu May 15, 2008 10:25 pm ]
Post subject:	Re: Regular Samurai #3
Thanks, I am looking forward to the next version with this excellent feature for fat-headed puzzle designers.

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