Search found 946 matches

by detuned
Sat 05 Jan, 2019 4:47 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Catalogue of Examples
Replies: 1
Views: 722

Re: Catalogue of Examples

I've unlocked this post as I continue to edit and rearrange this - however categorising each of the examples is not an exact science and if anyone has another opinion about how to classify these examples then I'd be very happy to hear.
by detuned
Sat 05 Jan, 2019 4:39 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Logidoku [WPF Sudoku GP 2013]
Replies: 2
Views: 775

Re: Logidoku [sudoku GP 2013]

This is interesting. I've had in mind (somewhat provocatively) to post a Killer Sudoku example in this forum, as I don't think from one point of view there is too much difference between the two...
by detuned
Sat 05 Jan, 2019 4:25 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Seek and Spell sudoku [WPF Sudoku GP 2013]
Replies: 2
Views: 512

Re: Seek and Spell sudoku [sudoku GP 2013]

Hi Fred - could you post a link to the source of this puzzle please?
by detuned
Sat 05 Jan, 2019 4:06 pm
Forum: Puzzle Competitions
Topic: Puzzle Ramayan - 2019
Replies: 9
Views: 2137

Re: Puzzle Ramayan - 2019

I thought that Eight Winds and Wranglers were kind of strange types to have on a round called Classics and Evergreens, but reading more about the competition the format guarantees there will be two lots of two "exploratory" variants on each and every round. And I don't think anything more needs to b...
by detuned
Fri 04 Jan, 2019 6:23 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 2244

Re: Very Hard Classic Sudoku [WSC 2010]

Hi Berni, thanks very much for your thoughts. The main issue I have with the description of trial and error as a logical technique is the observation that, if you are fortunate from a speed solving point of view, you get lucky and don’t hit an error. Although I am not 100% certain, I can’t imagine t...
by detuned
Fri 04 Jan, 2019 12:10 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 10
Views: 2222

WPF Sudoku GP

The 2019 season starts off this weekend, with Dutch authors taking their traditional 1st round spot.

http://gp.worldpuzzle.org
by detuned
Thu 03 Jan, 2019 5:50 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Catalogue of Examples
Replies: 1
Views: 722

Catalogue of Examples

This thread is a work in progress, but aims to provide a catalogue for each of the examples in this forum grouped very roughly into themes. This should hopefully be a bit more convenient for people wishing to navigate the forum. (Lack of) (Clear) Regional Constraints - Disjoint Regions Sudoku - Free...
by detuned
Thu 03 Jan, 2019 5:46 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Tetris Sudoku [WSC 2011]
Replies: 0
Views: 589

Tetris Sudoku [WSC 2011]

Tetris Sudoku [WSC 2011].png This puzzle shares some similarity with Star Battle Sudoku, in that the puzzle requires you to place some (repeated) symbols with additional properties - in this case the additional symbols are shaded squares, and the additional constraint is that these must all be conn...
by detuned
Thu 03 Jan, 2019 5:40 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Sudoku Pieces [WSC 2011]
Replies: 2
Views: 696

Sudoku Pieces [WSC 2011]

[Placeholder as the attachment size is apparently too large - I'll try and fix later] For those who can still remember it, this puzzle required the placement of symbols - in the form of pictures of famous Budapest landmarks - and there were clues in the grid that had to be moved by exactly one cell ...
by detuned
Thu 03 Jan, 2019 5:32 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 3086

Wrong Puzzles? [WSC 2011]

Wrong Puzzles [WSC 2011].png The first round of the 2011 WSC featured a booklet of examples similar to the above, where the only thing required of the solver was to mark whether the solution grid was a valid Sudoku solution, or not. This does not require the solver to place any numbers. This year w...
by detuned
Thu 03 Jan, 2019 3:21 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 2244

Re: Very Hard Classic Sudoku [WSC 2010]

Thanks - that one gets a slightly higher diabolical rating of 559 at http://www.sudokuwiki.org/sudoku.htm
by detuned
Thu 03 Jan, 2019 3:06 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 2244

Re: Very Hard Classic Sudoku [WSC 2010]

It depends exactly what we mean by solve. Many solvers only consider something to have been solved "logically" if at each stage of solving the puzzle, the solver is 100% confident that the number placed is part of the solution. Nevertheless, from a competition point of view, the only thing that matt...
by detuned
Wed 02 Jan, 2019 2:33 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Surplus / Deficit Sudoku [WSC 2018, lots of other contests]
Replies: 3
Views: 1423

Re: Surplus / Deficit Sudoku [WSC 2018, lots of other contests]

Apologies for the multi-dimensional nature of the poll. I hope to have given a good representation to different views on this one, but when we are talking about several examples all at once it becomes hard to specifically tailor the poll to cover all bases. If you happen to feel differently to any o...
by detuned
Wed 02 Jan, 2019 2:20 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Surplus / Deficit Sudoku [WSC 2018, lots of other contests]
Replies: 3
Views: 1423

Re: Surplus / Deficit Sudoku [WSC 2018, lots of other contests]

Thomas posted a lot of background information on his Grandmaster puzzles-blog, but since I'm not 100% sure, if giving the reference is enough to meet copyright restrictions, I chose a different picture as example. Richard will not sue me for sure :D https://www.gmpuzzles.com/blog/sudoku-rules-and-i...
by detuned
Wed 02 Jan, 2019 12:18 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Tripod Sudoku [Serkans Blog]
Replies: 3
Views: 1144

Re: Tripod Sudoku [Serkans Blog]

No need to be sorry, it’s a time consuming task and I’m more than glad if people can help me out :-) thanks for posting!
by detuned
Wed 02 Jan, 2019 12:16 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Zigzag Sudoku [WSC 2007]
Replies: 2
Views: 1194

Re: Zigzag Sudoku [WSC 2007]

I would say the special series is just a case of really bad phrasing - I don’t think there is anything there to upset anyone who isn’t also upset by consecutive sudoku. I would say the thing to focus on is the two solutions. On the other hand, it would be interesting if there was some opinions again...
by detuned
Wed 02 Jan, 2019 12:07 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Blackout Sudoku [Richards SVS]
Replies: 1
Views: 881

Re: Blackout Sudoku [Richards SVS]

This is a very interesting case where I’m not sure if I have a definite personal opinion about! For classic sudoku, the requirement is that 1-9 appear everywhere exactly once. This is equivalently described as appears everywhere “at most once” - ie non repeating - or “at least once” - a less common ...
by detuned
Wed 02 Jan, 2019 11:51 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Tripod Sudoku [Serkans Blog]
Replies: 3
Views: 1144

Re: Tripod Sudoku [Serkans Blog]

This also featured in the 2011 WSC, but you beat me to it.

In theory this puzzle requires the drawing of regions as well as the placement of numbers
by detuned
Mon 31 Dec, 2018 11:19 am
Forum: WPF Sudoku Technical Discussion forum
Topic: READ ME FIRST: What is a Sudoku Committee
Replies: 28
Views: 4671

Re: READ ME FIRST: What is a Sudoku Committee

I don't see myself how (1) "What is a Sudoku?" is a question I have anything more to say about than the basic thoughts above. An Arrow Sudoku is not a sudoku. A Diagonal sudoku is not a sudoku. It has some cells with more than 3 unique placement constraints. They are at best Sudoku Variations. Ther...
by detuned
Sun 30 Dec, 2018 11:12 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Greek-Latin Squares (Eulero)
Replies: 3
Views: 1500

Re: Greek-Latin Squares (Eulero)

I have to say I'm struggling to see any interpretation where I can see this being a Sudoku - does anyone feel any differently, and if so, why? This is not to say that non-examples (if indeed this is a non example) are not useful in their own right. It is certainly very useful to have non examples to...
by detuned
Sun 30 Dec, 2018 6:16 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: READ ME FIRST: What is a Sudoku Committee
Replies: 28
Views: 4671

Re: READ ME FIRST: What is a Sudoku Committee

I feel this productive discussion is beginning to bear fruit - thank you! The example of adding a pair of diagonal constraints reminds me of some of some examples responsible for the bad feelings expressed following the 2009 WSC - perhaps this discussion is better placed in this thread: http://forum...
by detuned
Sun 30 Dec, 2018 6:13 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Zilina Sudoku [WSC 2009]
Replies: 1
Views: 983

Zilina Sudoku [WSC 2009]

Zilina Sudoku [WSC 2009].png This (in)famous example was used in the final play-off to determine the World Sudoku Champion in 2009. The grid features two sorts of "extra regions" - firstly the coloured letter shapes, where numbers placed are not permitted to repeat, and secondly the marked diagonal...
by detuned
Sun 30 Dec, 2018 5:19 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: READ ME FIRST: What is a Sudoku Committee
Replies: 28
Views: 4671

Re: READ ME FIRST: What is a Sudoku Committee

And what exactly is a big step? Consider that: - 50m freestyle and 100m sprint are both races in which fields of competitors look to get to one end of the course as fast as possible in order to finish in 1st place. - 50m freestyle is swimming in water, and 100m sprint is running on a track. In one s...
by detuned
Sun 30 Dec, 2018 3:26 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: READ ME FIRST: What is a Sudoku Committee
Replies: 28
Views: 4671

Re: READ ME FIRST: What is a Sudoku Committee

A provocative thesis: If we always change the classic Sudoku rules only minimally, after 1000 steps we come to the conclusion that Masyu is a Sudoku, because we can't overcome ourselves at any step to say "no". I'd like to explore this thesis a little more. Athletics is a loose collection of differ...