Search found 19 matches

by Realshaggy
Tue 15 Jan, 2019 10:48 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 2497

Re: Disjoint regions sudoku [new example]

It is clearly a sudoku but not appropriate for a contest in my opinion. And not only for the colour-problems.
by Realshaggy
Mon 14 Jan, 2019 3:44 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 2497

Re: Disjoint regions sudoku [new example]

I would refuse to solve it in any contest. This is just a lazy way of adding artificial difficulty to the puzzle and annoying to solve. Even more than using letters instead of numbers without special reasons to do so. Imho things like that are disrespectful to the solver.
by Realshaggy
Wed 09 Jan, 2019 10:40 pm
Forum: Puzzle Competitions
Topic: Puzzle Ramayan - 2019
Replies: 10
Views: 2926

Re: Puzzle Ramayan - 2019

In need half of Ken Endos time for entering the answer keys. Disgusting.
by Realshaggy
Tue 08 Jan, 2019 12:40 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 3083

Re: Three different questions?

I think, this is going a bit far from the question of the topic, but if we are already at discussing round concepts and big special rounds: I only remember a few examples, where these rounds were overvalued, and these examples probably are outliers because the top solvers were even fast than expecte...
by Realshaggy
Mon 07 Jan, 2019 9:17 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: 3D-Sudoku (German Sudoku Championship 2006)
Replies: 7
Views: 1666

Re: 3D-Sudoku (German Sudoku Championship 2006)

One might argue, that the number of regions is pretty low (or in other words the number of symbols very high). Here we have 12 regions in a 64 cell puzzle. An 8x8-latin square already has 16.
by Realshaggy
Mon 07 Jan, 2019 11:27 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 3083

Re: Three different questions?

As you took DSM as an example, I think it's important to know why these contests are like that: These have been authored by basically the same group of people for the last twelve years. In the first years, Stefan was the head of authors and Richard provided a big chunk of the puzzles. In the last ye...
by Realshaggy
Wed 02 Jan, 2019 2:51 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Surplus / Deficit Sudoku [WSC 2018, lots of other contests]
Replies: 3
Views: 1599

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

I wasn't sure, if I should post them each on their own. But as far as I can remember, they almost always come as a pair in a contest. What makes sense, because mixed regions would eliminate a lot of the nice extra logic that comes with all n+1/n-1 regions. If you don't use that, there is not much mo...
by Realshaggy
Wed 02 Jan, 2019 12:37 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Surplus / Deficit Sudoku [WSC 2018, lots of other contests]
Replies: 3
Views: 1599

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

These puzzles have been regulary used in contests since their invention. They usually come in pairs and also usually are not bigger than 7x7 with region size n+1 for the Surplus and region size n-1 for the Deficit Sudoku. Because solving becomes rather ugly and error-prone after that and it is possi...
by Realshaggy
Wed 02 Jan, 2019 12:03 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Tripod Sudoku [Serkans Blog]
Replies: 3
Views: 1320

Re: Tripod Sudoku [Serkans Blog]

Yes sorry, I was not sure if it is better to wait until you finished your review of past WSC, but who knows how long that takes.
by Realshaggy
Wed 02 Jan, 2019 11:57 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Snake Sudoku [Richards SVS]
Replies: 0
Views: 1281

Snake Sudoku [Richards SVS]

Rules: Place the digits from 1 tot 9 in every row, column and 3x3-block. There is a snake hidden in the grid with head and tail on the grey cells. The snake doesn't touch itself, not even diagonally. It has the form 123456789123..., starts with 1 and ends with 9. 3206-1.png The example is taken from...
by Realshaggy
Wed 02 Jan, 2019 11:41 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Blackout Sudoku [Richards SVS]
Replies: 1
Views: 1005

Blackout Sudoku [Richards SVS]

Rules: Place digits from 1 to 9 in the white cells such that each row, column and 3x3 box contains different digits. 3444-1.png The example is taken from Richard's weekly Sudoku Variant Series from the puzzle portal of Logic Masters Germany. https://logic-masters.de/Raetselportal/Raetsel/zeigen.php?...
by Realshaggy
Wed 02 Jan, 2019 11:29 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Tripod Sudoku [Serkans Blog]
Replies: 3
Views: 1320

Tripod Sudoku [Serkans Blog]

Rules: Fill the grid with digits 1-n and divide the grid into some regions, so that each digit appears exactly once in every row, column and region. All points where three lines meet are given. There are no points where four lines meet. tripod_sudoku_example2-e1339974687429.png This is a case, I'm n...
by Realshaggy
Fri 27 Jun, 2014 5:21 pm
Forum: Puzzle Competitions
Topic: Logic Masters 2014 - German Puzzle Championship
Replies: 6
Views: 8317

Re: Logic Masters 2014 - German Puzzle Championship

Hello, I've now reviewed the point claims and finalized the rankings. All contests can now be started freely. That means you can solve them just like the original contest and see your results afterwards. However, your solutions and scores will not be stored permanently, but will be automatically del...
by Realshaggy
Tue 24 Jun, 2014 8:01 am
Forum: Puzzle Competitions
Topic: Logic Masters 2014 - German Puzzle Championship
Replies: 6
Views: 8317

Re: Logic Masters 2014 - German Puzzle Championship

Logic Masters 2014 is now over. The offline finals were won by Ulrich Voigt, who defended his title and won his eight german championship. Second place goes to Florian Kirch, who won the preliminary rounds by a big margin of almost 200 points. Third place goes to Roland Voigt and fourth place to Mar...
by Realshaggy
Sat 21 Jun, 2014 4:45 pm
Forum: Puzzle Competitions
Topic: Logic Masters 2014 - German Puzzle Championship
Replies: 6
Views: 8317

Re: Logic Masters 2014 - German Puzzle Championship

Correction:
While finishing the instruction booklet, I forgot that puzzle 7.4 Coral is 11x10. So there are no "main diagonals". Please use the diagonals starting from top left and from top right, even if they did not end in the opposite corner.
by Realshaggy
Sat 21 Jun, 2014 12:55 am
Forum: Puzzle Competitions
Topic: Logic Masters 2014 - German Puzzle Championship
Replies: 6
Views: 8317

Re: Logic Masters 2014 - German Puzzle Championship

Hi, we've now prepared the contest pages, and there are only some hours left until the start of the first contest. For easy access please use our starting page http://www.logic-masters.de/?chlang=en Please remind, that you have time until monday evening 8pm (CEST/UTC+2) for each contest, so there is...
by Realshaggy
Mon 16 Jun, 2014 11:25 pm
Forum: Puzzle Competitions
Topic: Logic Masters 2014 - German Puzzle Championship
Replies: 6
Views: 8317

Re: Logic Masters 2014 - German Puzzle Championship

Dear Puzzle Fans, on the next weekend, the Logic Masters 2014 take place in Stuttgart. 41 german participants are fighting for the title of the German Puzzle Champion as well as for the qualification for the upcoming World Puzzle Championship in London. This year we want to invite everybody to take ...
by Realshaggy
Fri 06 Jun, 2014 12:35 pm
Forum: Puzzle Competitions
Topic: Logic Masters 2014 - German Puzzle Championship
Replies: 6
Views: 8317

Logic Masters 2014 - German Puzzle Championship

Hi everybody, on the 21st of June the Logic Masters 2014, which serve as the German Puzzle Championship and the german qualification for WPC 2014, will take place in Stuttgart. This is an offline contest of around 6 hours of puzzle rounds for everybody plus a final round. We are planning to organize...
by Realshaggy
Thu 31 Oct, 2013 10:14 am
Forum: Welcome!
Topic: Hello from a mathematician and Stargate fan
Replies: 11
Views: 15713

Re: Hello from a mathematician and Stargate fan

There are much more connections to discover. For example Bertram Felgenhauer, also german participant in IMO'95, wrote many articles about the mathematics of Sudoku. Quote from Wikipedia: Nonetheless, the number of valid Sudoku solution grids for the standard 9×9 grid was calculated by Bertram Felge...