Search found 117 matches

by Feadoor
Tue 26 Jan, 2021 6:58 pm
Forum: Puzzle Competitions
Topic: 2021 WPF Sudoku and Puzzle GPs
Replies: 23
Views: 747

Re: 2021 WPF Sudoku and Puzzle GPs

Sorry to sound silly, but by parity properties you mean like a checkerboard and it has to go white black white black? The observation I used for the example was that if you colour the grid as you say, all of the tens digits of the primes share a colour, and all of the units digits share a colour. A...
by Feadoor
Mon 25 Jan, 2021 3:38 pm
Forum: Puzzle Competitions
Topic: 2021 WPF Sudoku and Puzzle GPs
Replies: 23
Views: 747

Re: 2021 WPF Sudoku and Puzzle GPs

Oh no, I hope you have better luck for the puzzle GP. Thanks for the tips! I was wondering, though, what is the no battenburg rule? In Cave, you have two things to keep in mind: - The white cells must be connected - The black cells must all connect to the edge of the board Imagine you had a 2x2 squ...
by Feadoor
Fri 22 Jan, 2021 9:18 pm
Forum: Puzzle Competitions
Topic: Puzzle Ramayan and Sudoku Mahabharat 2021
Replies: 0
Views: 53

Puzzle Ramayan and Sudoku Mahabharat 2021

In the same vein as the GP thread, let's combine these two threads this year. The first Puzzle Ramayan round has started, and runs throughout the weekend.

https://logicmastersindia.com/live/?contest=PR202101
by Feadoor
Tue 19 Jan, 2021 9:39 am
Forum: Puzzle Competitions
Topic: 2021 WPF Sudoku and Puzzle GPs
Replies: 23
Views: 747

Re: 2021 WPF Sudoku and Puzzle GPs

Preliminary results are out, the UK top 3 are: 32. Sam Cappleman-Lynes - 495 41. Jeremy Kong - 468 58. Tom Collyer - 412 The overall top 3 (Kota, Tantan and Tiit) are well clear of the rest of the field. Puzzles-wise, I did not regret my decision to just keep guessing at the endpoints of the lines i...
by Feadoor
Thu 14 Jan, 2021 9:15 pm
Forum: Puzzle Competitions
Topic: 2021 WPF Sudoku and Puzzle GPs
Replies: 23
Views: 747

Re: 2021 WPF Sudoku and Puzzle GPs

Yes - that's essentially all there is to it. Any clue in the range 1-4 must start with a 1, in the range 5-8 a 2 and so on. The rest is standard Sudoku and comparing the values within each range of four to get further restrictions. It can be a lot to keep track of so I strongly suggest crossing a cl...
by Feadoor
Thu 14 Jan, 2021 10:03 am
Forum: Puzzle Competitions
Topic: 2021 WPF Sudoku and Puzzle GPs
Replies: 23
Views: 747

Re: 2021 WPF Sudoku and Puzzle GPs

Sudoku Round 1 starts tomorrow, and the instruction booklet is available here: https://gp.worldpuzzle.org/content/instruction-booklet
by Feadoor
Thu 10 Dec, 2020 7:35 pm
Forum: General Puzzle Discussions
Topic: Some puzzles for your solving pleasure
Replies: 25
Views: 15297

Re: Some puzzles for your solving pleasure

As an aside, for us that are not great at solving Sudoku it would help if the grids were larger to give us more space for having to put candidates in etc. Thanks Liane, I'll bear that in mind in future. Tom/David, I'm glad you enjoyed them. They were a lot of fun to create. I am intrigued which one...
by Feadoor
Thu 10 Dec, 2020 9:32 am
Forum: Puzzle Competitions
Topic: Division C 2020-2021
Replies: 14
Views: 2585

Re: Division C 2020-2021

I'm only just getting round to looking at the examples for these: the diagonal fillomino example has two solutions, I believe (you can swap R2C3 and R3C2 in the given solution).
by Feadoor
Fri 27 Nov, 2020 11:53 am
Forum: General Puzzle Discussions
Topic: Some puzzles for your solving pleasure
Replies: 25
Views: 15297

Re: Some puzzles for your solving pleasure

I've been making some more puzzles. A whole bunch of Classic Sudoku this time. Enjoy!
by Feadoor
Mon 23 Nov, 2020 8:12 am
Forum: General Puzzle Discussions
Topic: Printing puzzles for contests
Replies: 3
Views: 846

Re: Printing puzzles for contests

This is an interesting question which as far as I know does not have a common consensus. There is some discussion and food for thought here: https://hausigel.de/blog/2020/03/08/screen-vs-paper/ Personally, if a contest is designed to be solved on paper, I think it's cheating. Not just because of fun...
by Feadoor
Tue 20 Oct, 2020 8:19 pm
Forum: Puzzle Competitions
Topic: Divisions A and B 2020-2021
Replies: 11
Views: 2296

Re: Divisions A and B 2020-2021

I haven't used the site so this is pure speculation, but my intuitive feeling is that anyone with a mouse is likely to be able to make accurate movements significantly more quickly than me using a trackpad.
by Feadoor
Mon 19 Oct, 2020 6:39 pm
Forum: Puzzle Competitions
Topic: Divisions A and B 2020-2021
Replies: 11
Views: 2296

Re: Divisions A and B 2020-2021

Regarding Puzzle Duel, I don’t see an issue with giving everyone the same solving medium. After a very interesting discussion about writing speeds and notations, I like the idea of levelling that particular playing field. If it doesn’t work well, we can change it for 2021-2022. It's only level if I...
by Feadoor
Sat 04 Jul, 2020 10:03 pm
Forum: Welcome!
Topic: Hello
Replies: 6
Views: 4106

Re: Hello

Don't worry, everyone else is baffled by that too.
by Feadoor
Sat 20 Jun, 2020 12:46 pm
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2020
Replies: 16
Views: 8345

Re: UK Puzzle Championship 2020

Thanks Liane :) 4. Yin Yang appears to be missing the rule about 2x2 areas In 8. Anglers, are all cells used by a fishing line? I think this is a standard rule but I have seen contests where it isn't used. What does "excluding directions pointing away from the edge of the grid" mean in 23. Panoramic...
by Feadoor
Thu 28 May, 2020 3:46 pm
Forum: Puzzle Competitions
Topic: Puzzle Ramayan - 2020
Replies: 13
Views: 9448

Re: Puzzle Ramayan - 2020

Very nicely done, Freddie!
by Feadoor
Thu 21 May, 2020 6:58 pm
Forum: Puzzle Competitions
Topic: WPF Puzzle GP 2020
Replies: 67
Views: 35241

Re: WPF Puzzle GP 2020

It doesn't read to me, Tom, as if anyone is shooting down your ideas or trying to have an argument. Just like you have expressed your views on the matter, so have others. No bad faith to my eyes.
by Feadoor
Tue 19 May, 2020 3:42 pm
Forum: Puzzle Competitions
Topic: WPF Puzzle GP 2020
Replies: 67
Views: 35241

Re: WPF Puzzle GP 2020

For a dissenting opinion, I find the puzzle GP rules to be written very clearly, and I think it's been particularly noticeable this year that there has been a push for consistent terminology between puzzle types and consistent phrasing of common rules - for example the definition that is used for a ...
by Feadoor
Tue 28 Apr, 2020 7:13 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP 2020
Replies: 37
Views: 23282

Re: WPF Sudoku GP 2020

I ended up eating my words about the Triple Sum Sudoku. When I came to it during the test I thought it didn't look as fiddly as other puzzles I've done of the type, so I gave it a go and flew through it.
by Feadoor
Mon 27 Apr, 2020 4:46 pm
Forum: General Puzzle Discussions
Topic: Some puzzles for your solving pleasure
Replies: 25
Views: 15297

Re: Some puzzles for your solving pleasure

That is what I did - maybe I did get it after all then! I was also looking at something for some clone interactions that might have involved the four cells at R5 C1,9 and R1,9 C5 for example. The polished way of looking at it is (ROT13): Vs gur zvqqyr nern vf gur rkgen ertvba, fb gung gur bgure gjb...
by Feadoor
Mon 27 Apr, 2020 3:49 pm
Forum: General Puzzle Discussions
Topic: Some puzzles for your solving pleasure
Replies: 25
Views: 15297

Re: Some puzzles for your solving pleasure

detuned wrote:
Mon 27 Apr, 2020 3:16 pm
I think I might have missed this neat break-in. After a lot of staring at it, I did a short bit of trial and error to determine the extra regions area (which I'd already narrowed down to one of two possibilities). Any chance of a hint?
You can work it out using only the 1s.
by Feadoor
Mon 20 Apr, 2020 12:12 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP 2020
Replies: 37
Views: 23282

Re: WPF Sudoku GP 2020

ashaash11ash wrote:
Mon 20 Apr, 2020 11:35 am
And i think you are motivating me to author next year :D :D
I'll have to get some practice in then! :D
by Feadoor
Mon 20 Apr, 2020 7:55 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP 2020
Replies: 37
Views: 23282

Re: WPF Sudoku GP 2020

You may revisit your opinion after seeing the competition puzzle for number 10, Freddie. They can be very fiddly, and may be given with a completely empty grid. Pure conjecture, of course, but I expect I won't enjoy that puzzle and will probably avoid it if at all possible. I'm somewhat relieved not...
by Feadoor
Mon 13 Apr, 2020 11:54 am
Forum: General Puzzle Discussions
Topic: Some puzzles for your solving pleasure
Replies: 25
Views: 15297

Re: Some puzzles for your solving pleasure

I'm back with some more puzzles. These are, I think, all quite difficult. Nonetheless, they are all logically solvable. Have fun!
by Feadoor
Mon 13 Apr, 2020 11:51 am
Forum: General Puzzle Discussions
Topic: UKPA featured in the Guardian!
Replies: 2
Views: 3760

Re: UKPA featured in the Guardian!

Nice puzzles - were you approached to write them specifically for the article, or were they pre-existing?
by Feadoor
Fri 10 Apr, 2020 8:02 am
Forum: Puzzle Competitions
Topic: Sudoku Mahabharat 2020
Replies: 7
Views: 6994

Re: Sudoku Mahabharat 2020

Round 4 results - two UK finishers:

37. Tom Collyer - 102.2 (87:46)
40. Sam Cappleman-Lynes - 100.7 (89:16)
51. Freddie Hand - 88.6

Have you been practising your Sudoku, Freddie?

The 9x9 Little Killer was obviously the big story of this test. It took me over 30 minutes to solve :roll: