Search found 172 matches

by Fred76
Thu 14 Feb, 2019 12:08 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Puzzle decorations
Replies: 9
Views: 11094

Re: Puzzle decorations

I'm not sure I understand the question fully - as I don't think what you are describing is much of an issue. As far as I can tell, you are concerned about people being confused by rules which are redundant to solving the puzzle. It's not so much the question of confusion than the fact that this con...
by Fred76
Thu 14 Feb, 2019 11:46 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

If we set a boundary on what's allowed and what isn't there will obviously be puzzles very close to the edge. Someone may tweak the rules very very slightly, create a puzzle that's practically identical, yet falls outside the boundary. That feels nonsensical to me, and that's why it's my belief tha...
by Fred76
Wed 13 Feb, 2019 12:35 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Burodoku [new example]
Replies: 4
Views: 6763

Burodoku [new example]

Rules: Divide the grid along the grid lines in 6 non-overlapping regions containing 6 cells each. A region must not contain two cells with the same digit. Neighbouring cells that have a bold separation can't be part of the same region. burodoku.png Actually, this is not a very new example. I created...
by Fred76
Wed 13 Feb, 2019 12:12 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Arrow latin square [WPF puzzle GP 2019]
Replies: 0
Views: 4520

Arrow latin square [WPF puzzle GP 2019]

There are a few puzzle types appearing in puzzle competitions that I would like to propose for discussion, because they share some properties with sudoku. I'm not sure if they appeared in puzzle competitions because they were considered as non-sudoku or if they were included as sudoku variations. 22...
by Fred76
Wed 13 Feb, 2019 12:08 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Character battle [WPF puzzle GP 2018]
Replies: 2
Views: 5229

Character battle [WPF puzzle GP 2018]

There are a few puzzle types appearing in puzzle competitions that I would like to propose for discussion, because they share some properties with sudoku. I'm not sure if they appeared in puzzle competitions because they were considered as non-sudoku or if they were included as sudoku variations. 21...
by Fred76
Wed 13 Feb, 2019 11:59 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Odd Tapa Sudoku [WPF Sudoku GP 2018]
Replies: 2
Views: 5179

Odd Tapa Sudoku [WPF Sudoku GP 2018]

20- Odd tapa sudoku.png
20- Odd tapa sudoku.png (110.56 KiB) Viewed 5179 times
Source: sudoku GP website: http://gp.worldpuzzle.org/
by Fred76
Wed 13 Feb, 2019 11:57 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Figure sum sudoku [WPF sudoku GP 2017]
Replies: 8
Views: 10480

Figure sum sudoku [WPF sudoku GP 2017]

19 - figure sum sudoku.png
19 - figure sum sudoku.png (111.46 KiB) Viewed 10480 times
Source: sudoku GP website: http://gp.worldpuzzle.org/

Potential issue: hybridation with placing pentominoes.
by Fred76
Wed 13 Feb, 2019 11:53 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

-Monday: World Sudoku Championship, 3 hours max (not necessarily in one go!) of classic Sudokus; World Tapa Championship, 3 hours max (not necessarily in one go!) of classic Tapas; World Kakuro Championship, etc Basically several separate short competitions designed to find the best specialists at ...
by Fred76
Sun 27 Jan, 2019 3:06 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a sudoku? My answer.
Replies: 5
Views: 7773

Re: What is a sudoku? My answer.

Thanks for your answer. I'm sorry to ask so many questions, but there is still something that I would like to understand better. My main question about your definition is: How do you judge the "but not too many" in your text: "some (but not too many) constraints may be changed"? Not at all. That's e...
by Fred76
Sat 26 Jan, 2019 1:53 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Greek-Latin Squares (Eulero)
Replies: 3
Views: 6673

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? In my opinion, the only problem I see here is the lack of regions, exactly as latin square. The 2 layers are not a problem for me, and it makes me remind a ...
by Fred76
Sat 26 Jan, 2019 1:45 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a sudoku? My answer.
Replies: 5
Views: 7773

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. For the b. you mention scattered sudoku. I don't see which constraint has been replaced? My main question about your definition is: How do you judge the "but not too many" in your text: "some (but not ...
by Fred76
Sat 26 Jan, 2019 12:49 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

I would like to apologize for the overuse of word "ridiculous" in my previous post. There are 2 minimal postulates that I need to take part in this discussion: world sudoku championship should be a sudoku competition. A sudoku competition consists of solving sudoku puzzles. If one of these 2 postula...
by Fred76
Thu 17 Jan, 2019 10:34 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

Perhaps 'looks like a sudoku and has at least a semblence of sudoku logic' would be better. Neil, I'm sorry but I've still lot of problems with everything you say: the "looks like" create more problems than it solve, I can't understand the "semblence of sudoku logic", I don't understand why some pe...
by Fred76
Thu 17 Jan, 2019 9:55 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 12369

Re: Disjoint regions sudoku [new example]

I basically agree with everything that has been said here. Yes the use of colours is a problem. We can discuss about clarity of marking regions (I feel it's hard to make it clear without use of colours, but perhaps not impossible). Feadoor exactly understood what I did, and reconstructed the classic...
by Fred76
Mon 14 Jan, 2019 9:34 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 12369

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. Just for curiosity, would ...
by Fred76
Mon 14 Jan, 2019 9:30 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

Did you solve it? Yes. I assumed it's a classic sudoku and found out, that it has a unique solution. Oops, sorry, this is my fault: I forgot to write the rules :ugeek: . Rules: Draw a single, non-intersecting loop that passes through all cells containing a digit. The loop must go straight through t...
by Fred76
Mon 14 Jan, 2019 12:20 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

berni wrote:
Mon 14 Jan, 2019 10:50 am
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...
Did you solve it?
by Fred76
Mon 14 Jan, 2019 12:20 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 12369

Re: Disjoint regions sudoku [new example]

Tom, is it possible to make a poll on this one, too?
Thanks,
Fred
by Fred76
Mon 14 Jan, 2019 12:19 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 16462

Re: Three different questions?

On 1.1 - I'm not sure we need to get too technical with the definition of regions. The guiding principle should be that the regions are clear and well described, and I think trying to reach a level of abstract generalisations which covers a whole range of the cases isn't necessarily going to add mu...
by Fred76
Mon 14 Jan, 2019 11:55 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 16462

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? I think what makes a latin square to be a sudoku is regions, which ideally cover the whole grid an...
by Fred76
Mon 14 Jan, 2019 2:27 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 18144

Re: Wrong Puzzles? [WSC 2011]

Neil, Your post could require a very long answer on all points you raised. I'll not comment about the fact that you want to kill the wsc and replace by competitions about different puzzle types. About the first part of your post, I think the best way is to answer with a puzzle. Here it is: neil_sudo...
by Fred76
Sun 13 Jan, 2019 6:57 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Star Sudoku
Replies: 1
Views: 4025

Re: Star Sudoku

It has the related feature that some rows have only 8 cells (which can be a potential problem, too). I remember having seen this variant (in french magazine, very long time ago) with rule that each 8-cells rows was completed by the touching single cell. The primrose sudoku (this geometry: http://sud...
by Fred76
Sun 13 Jan, 2019 6:41 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 12369

Disjoint regions sudoku [new example]

Rules: Place a number from 1-9 in each empty cell in the grid such that each row, column and set of cells of same colour contains each number exactly once. disjoint.png It's a kind of disjoint groups sudoku without 3*3 boxes. It can be seen in another way, too; I'll comment more in few days, when so...
by Fred76
Fri 11 Jan, 2019 10:59 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Puzzle decorations
Replies: 9
Views: 11094

Puzzle decorations

Sometimes puzzles are not what they seem to be. For example in round 6 of WSC 2016, an extra-regions was presented as killer sudoku, a windoku as renban sudoku, a diagonal sudoku as pointing different, etc... that's due to the meeting of variant rules on some points (a 9 cells killer cage is an extr...
by Fred76
Fri 11 Jan, 2019 10:27 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Serbian irregular sudoku [WPF Sudoku GP 2015]
Replies: 1
Views: 3187

Serbian irregular sudoku [WPF Sudoku GP 2015]

18 - serbian irregular.png
18 - serbian irregular.png (86.35 KiB) Viewed 3187 times
Source: sudoku GP website: http://gp.worldpuzzle.org/

A puzzle which combine deficit and surplus regions in a more constrained way.