Search found 163 matches

by berni
Sun 27 Jan, 2019 5:05 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a sudoku? My answer.
Replies: 5
Views: 1475

Re: What is a sudoku? My answer.

There are situations where you HAVE to judge if a puzzle is a sudoku or not: if you are an author for a sudoku competition or the responsible of puzzle selection for sudoku competition. Then I think you can't avoid the question. How in practice do you do when you're in such situations? How do you j...
by berni
Sun 27 Jan, 2019 1:20 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a sudoku? My answer.
Replies: 5
Views: 1475

Re: What is a sudoku? My answer.

I'm happy that you change your mind about the fact that it is possible to define what is a sudoku. This is probably a misunderstanding. In the post Three different questions? I talked about a definition of sudoku variations not about the definition of the puzzle type sudoku. In the last case it's j...
by berni
Tue 22 Jan, 2019 11:02 am
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a sudoku? My answer.
Replies: 5
Views: 1475

What is a sudoku? My answer.

Having a little time to think about the original question I found the following answer. For me a sudoku consist of a grid of n times n cells, which is dissected into n regions of size n . Some cells may contain a number and the goal is to fill a single number into each cell, such that in every row, ...
by berni
Mon 21 Jan, 2019 11:03 am
Forum: Puzzle Competitions
Topic: Qualification for the German Sudoku Championship
Replies: 1
Views: 1180

Re: Qualification for the German Sudoku Championship

The contest has finished. Concratulations to Tantan, Tiit und Seungjae. Unfortunately the Little-Killer had two solutions, which was due to the fact, that the hints at the right border were missing. Luckily, the solution code of both solutions was the same and the intended solving path wasn't broken...
by berni
Fri 18 Jan, 2019 9:21 am
Forum: Puzzle Competitions
Topic: Qualification for the German Sudoku Championship
Replies: 1
Views: 1180

Qualification for the German Sudoku Championship

DSM2019.png The qualification round for the German Sudoku Championship will be held this weekend (starting today at 12:00 CEST, ending at monday 12:00 CEST). English instructions can be found in the german forum where you can also ask questions. Solution codes will be two rows marked by arrows whic...
by berni
Fri 18 Jan, 2019 9:10 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 3674

Re: Wrong Puzzles? [WSC 2011]

+1 for Nilz. You convinced me and I'd like to change my vote, but it looks like I can't do so.
by berni
Mon 14 Jan, 2019 1:41 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 3674

Re: Wrong Puzzles? [WSC 2011]

Fred76 wrote:
Mon 14 Jan, 2019 12:20 pm
Did you solve it?
Yes. I assumed it's a classic sudoku and found out, that it has a unique solution.
by berni
Mon 14 Jan, 2019 10:58 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 2905

Re: Three different questions?

Ignoring the fact, that I'd not demand distinct symbols, I can go along with 2.[123] and 3.1. But I think you do in 1.1 through 1.5 a huge effort to avoid bare latin squares. Is this really necessary?
by berni
Mon 14 Jan, 2019 10:50 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 3674

Re: Wrong Puzzles? [WSC 2011]

Fred76 wrote:
Mon 14 Jan, 2019 2:27 am
I hope you understand with this particular puzzle that your arguments can't be applied for wsc.
Sorry, but I don't understand what this puzzles has to do with the discussion...
by berni
Fri 11 Jan, 2019 8:28 am
Forum: Puzzle Competitions
Topic: Puzzle Ramayan - 2019
Replies: 10
Views: 2710

Re: Puzzle Ramayan - 2019

Realshaggy wrote:
Wed 09 Jan, 2019 10:40 pm
In need half of Ken Endos time for entering the answer keys. Disgusting.
Would be nice to know, how much time Ken needed for entering the answer keys. ;)
by berni
Mon 07 Jan, 2019 1:20 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 2905

Re: Three different questions?

detuned wrote:
Sun 06 Jan, 2019 6:39 pm
For example, we definitely need to have a 2-dimensional grid of cells,
When I read this, I remembered as sudoku from 2006, which was 3D and which might qualify as sudoku... I put it in an own thread.
by berni
Mon 07 Jan, 2019 1:16 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: 3D-Sudoku (German Sudoku Championship 2006)
Replies: 7
Views: 1606

3D-Sudoku (German Sudoku Championship 2006)

Rules: Place numbers 1 to 16 in the cells. All numbers in all plaines (in all three directions) have to be different.
A3D.png
A3D.png (62.21 KiB) Viewed 1606 times
Published with permission from Heines Rätselbibliothek.

Possible objections: It's 3D, instead of areas a 3rd dimension is added.
by berni
Mon 07 Jan, 2019 10:32 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 2905

Re: Three different questions?

Why do you say it's not wishable to give clear border? [...] no repeated digits, no blank cells in solution, regions of size N where N is the number of distinct symblos to be placed, etc... [...] I first of all I said, it's not possible. But if you think it is, can you just define it, like you thin...
by berni
Sun 06 Jan, 2019 4:02 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 2905

Three different questions?

In my oppinion, we've got at least three different questions here. I would be happy, if we could segregate them a little: Which variation is considered a valid sudoku variation? (Killer is, Latin Square or Starbattle is not, but where are the borders...) How do we cope with difficult solving techniq...
by berni
Sat 05 Jan, 2019 10:47 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 2574

Re: Very Hard Classic Sudoku [WSC 2010]

From that point of view, a round of harder classics coukd bsaid to be in some sense fairer as the luck, should, on average, balance itself out. Not that on average guarantees everything. It is still possible (although less likely) for an individual solver to have a run of lucky (or unlucky) guesses...
by berni
Fri 04 Jan, 2019 10:05 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 2574

Re: Very Hard Classic Sudoku [WSC 2010]

In some of the posts so far, you mix "guessing" with "trail and error". I think, we should clearly distinguish between these two, because they are two different solving techniques, both feasable in some situations. To clearify: Guessing means, that one puts a more or less random number in one cell a...
by berni
Wed 02 Jan, 2019 10:09 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Zigzag Sudoku [WSC 2007]
Replies: 2
Views: 1327

Re: Zigzag Sudoku [WSC 2007]

It's hard for me, to vote here: I think it's perfectly fine to have a sudoku with two solutions when this is known beforehand and both solutions are to be found. For me this is a "unique" solution (The two solutions of the sudoku form one solution of the whole puzzle). As far as I remember Wei-Hwa o...
by berni
Wed 02 Jan, 2019 9:54 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 2574

Re: Very Hard Classic Sudoku [WSC 2010]

In my oppinion, someone who claims to be a sudoku champion should be able to solve all 9x9 standard sudokus, even with quite difficult logic.
by berni
Wed 07 Mar, 2018 7:24 pm
Forum: Puzzle Competitions
Topic: German qualifiers this weekend
Replies: 2
Views: 2551

Re: German qualifiers this weekend

Hi rob - I missed this over the weekend, I can't imemdiately see the passwords for the files. Will these be published for anyone who wants to have an unofficial go at the contest after time? Meanwhile there is a password free version available: https://logic-masters.de/LM/2018/ and than klick on "R...
by berni
Sat 21 Oct, 2017 8:47 pm
Forum: Announcements
Topic: Record results for UK teams at the World Championships
Replies: 6
Views: 7141

Re: Record results for UK teams at the World Championships

Coincidentally, we are (I believe) the highest ranked team in either contest that has no sponsor. I never heard of any sponsor for the german team... (Well actually in ancient times - before 2006 - we had one.) and again in Slovakia next year. You mean Chech, don't you?!? Or has there been a change?
by berni
Wed 28 Jun, 2017 2:23 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 456634

Re: croco-puzzle

Yes, I think I understand. Instead of fixed logistic curves defined by a fixed parameter of 2, this exponent was variable. Do you know to what extent this value varied away from 2 before your change? It was in between 1.69 and 2.38. Distribution: 5x 1.7, 72x 1.8, 286x 1.9, 817x 2.0, 536x 2.1, 221x ...
by berni
Tue 27 Jun, 2017 8:29 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 456634

Re: croco-puzzle

Is it possible for you to explain a little more about the formula Berni? This kind of thing does interest me a lot. Well the formular with an explanation (in german though) can be found at Rating description . In the formula "dauer" is "duration", "min" is the fastest and "med" is the median of all...
by berni
Tue 27 Jun, 2017 10:10 am
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 456634

Re: croco-puzzle

I have just been sent an e-mail congratulating me on becoming a second Dan. Second Dan used to be for a long-term average of over 2200 and I'm nowhere near that. Have the rules changed? Well, the rules have changed - I removed some part of the formula which proved to press the rating down over time...
by berni
Mon 01 May, 2017 3:51 pm
Forum: Announcements
Topic: Bot registrations
Replies: 11
Views: 10777

Re: Bot registrations

It's impressive in a way if the bots can beat the registration checks, but I've also heard stories of so-called click farms where people who are paid (pennies) to set up accounts, amongst other things In the german forum , we use a hack, were the people are asked to ignore the captcha and write 'lo...