Search found 989 matches

by detuned
Thu 14 Feb, 2019 8:38 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Character battle [WPF puzzle GP 2018]
Replies: 2
Views: 2242

Re: Character battle [WPF puzzle GP 2018]

So I'm not sure blank cells is exactly the right way to be thinking about things. At the start of the puzzle everything is blank, but that blankness has the meaning of ambiguity - in the final solution there will either definitely be a star/character/whatever there or definitely not be a star there....
by detuned
Thu 14 Feb, 2019 8:30 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Burodoku [new example]
Replies: 4
Views: 2855

Re: Burodoku [new example]

I'll also add that on reflection, this example isn't a million miles away from Tripod Sudoku
by detuned
Thu 14 Feb, 2019 8:27 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Burodoku [new example]
Replies: 4
Views: 2855

Re: Burodoku [new example]

I tend to agree with Fred and disagree with Neil here. I think as soon the puzzle involves elements which don't involve placing numbers, then we have veered away from Sudoku - even if there are just one or two line segments missing. From that point of view I think we are repeating a discussion we've...
by detuned
Thu 14 Feb, 2019 8:21 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Puzzle decorations
Replies: 9
Views: 4765

Re: Puzzle decorations

Neil: I very much enjoyed your fumbling around with topological ideas :) I think there is definitely something to be said for defining what a Sudoku is definitely not (or indeed defining some red lines for puzzles that should be appearing at competitions). The difficulty lies in being entirely compr...
by detuned
Thu 14 Feb, 2019 8:18 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Puzzle decorations
Replies: 9
Views: 4765

Re: Puzzle decorations

My initial reaction to those 3 examples is similar to Neil. The bottom two are definitely not classic sudoku. The fact that they are very similar to classic is due to the fact that the constraints used resolve themselves trivially, leaving the rest of the puzzle as an exercise in filling in the clas...
by detuned
Sun 10 Feb, 2019 6:42 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 11099

Re: WPF Sudoku GP

I had a go at this earlier today. I think I'd have been amongst those who got all but the sum-product killer out. The repeating numbers within cages wasn't particularly nice to see. Re the hard classic - making a well placed guess to get going wasn't particularly difficult. I guess it's a matter of ...
by detuned
Sun 10 Feb, 2019 12:36 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: General Updates
Replies: 1
Views: 2804

General Updates

This thread is to provide general updates from the "What is a Sudoku?" committee. Recently activity in the forum has died down a bit, and this has been in no small part due to myself being very busy at work in January and having taken a holiday to recover at the start of February. I will be posting ...
by detuned
Fri 01 Feb, 2019 9:07 pm
Forum: Puzzle Links
Topic: Grandmaster Puzzles
Replies: 2
Views: 7439

Re: Grandmaster Puzzles

https://www.gmpuzzles.com/blog/2019/01/ ... hn-bulten/

Adding the direct link to the puzzle David mentioned above. And yes, this is definitely worth trying!
by detuned
Thu 31 Jan, 2019 9:43 pm
Forum: Puzzle Competitions
Topic: Puzzle Ramayan - 2019
Replies: 10
Views: 6291

Re: Puzzle Ramayan - 2019

Results are out, Neil managed another impressive top 10 finish and James wasn't too far behind him in finishing the set. Adam was best of the rest, missing out on the first four puzzles

10 Neil Zussman 133.3
18 James McGowan 127.1
57 Adam Bissett 80
by detuned
Mon 28 Jan, 2019 8:25 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Sudoku Notes from Wei-Hwa Huang
Replies: 1
Views: 1895

Re: Sudoku Notes from Wei-Hwa Huang

This is a fascinating link, thank you for sharing!
by detuned
Wed 23 Jan, 2019 1:56 pm
Forum: Puzzle Competitions
Topic: Puzzle Ramayan - 2019
Replies: 10
Views: 6291

Re: Puzzle Ramayan - 2019

Round 2 happening this weekend. It looks kind of fruity to me at first glance, so well worth familiarising yourself with the IB before starting. There's also a bunch of corrections in the forum post

http://logicmastersindia.com/PR/2019012/
by detuned
Wed 23 Jan, 2019 1:52 pm
Forum: Puzzle Competitions
Topic: WPF Puzzle GP
Replies: 22
Views: 9520

Re: WPF Puzzle GP

Preliminary Results are now out (seems to be a delay compared to the Sudoku GP). Top 3 UK:

12. Neil Zussman 594
41. Saul Glasman 456
54. Adam Bissett 422
by detuned
Tue 22 Jan, 2019 9:11 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a sudoku? My answer.
Replies: 5
Views: 3400

Re: What is a sudoku? My answer.

Thanks Berni, I am insanely overworked right now so haven't really had time to think about things over the last week or so - and nor will I likely to be over the next week or so - but I am very glad to see some of the elements we have discussed so far put together in a coherent whole. I'm sure there...
by detuned
Sat 19 Jan, 2019 10:39 am
Forum: Puzzle Competitions
Topic: Sudoku Mahabharat - 2019
Replies: 12
Views: 7176

Re: Sudoku Mahabharat - 2019

Top 3 from round 2:

23. Tom Collyer 111.3
38. Heather Golding 94
69. Sam Cappleman-Lynes 79
by detuned
Thu 17 Jan, 2019 12:29 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Wrong Puzzles? [WSC 2011]
Replies: 16
Views: 8233

Re: Wrong Puzzles? [WSC 2011]

Fred, Could I ask you to tone down your posts a little. If you are going to forensically dissect, line by line, any opinion which is contrary to yours with comments like "this is ridiculous" then you are going to discourage anyone from offering an opinion at all. And we must definitely not discourag...
by detuned
Tue 15 Jan, 2019 12:25 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 5434

Re: Disjoint regions sudoku [new example]

So I think this comes down to what we are discussing in another thread. We clearly have rows, columns and regions, but I think it's debatable whether in the original presentation the regions are clearly marked. Liane's point about the use of colour is interesting - yes we have a colour blindness iss...
by detuned
Sun 13 Jan, 2019 7:51 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 11
Views: 5434

Re: Disjoint regions sudoku [new example]

Could this variant also be described by the rules of Scattered Sudoku?
by detuned
Sun 13 Jan, 2019 4:58 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Within Box Skyscrapers Sudoku [WSC 2013]
Replies: 0
Views: 1963

Within Box Skyscrapers Sudoku [WSC 2013]

Within Box Skyscrapers [WSC 2013].png Source: 2013 WSC, Beijing Assuming you are happy with the skyscrapers constraint, this puzzle adds an extra element by requiring you to find the value of internal skyscrapers clues. For regular skyscrapers puzzles, the clues are all given at the edge of the grid.
by detuned
Sun 13 Jan, 2019 4:51 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Anti-Knight-and-Queen Sudoku [WSC 2013]
Replies: 0
Views: 1819

Anti-Knight-and-Queen Sudoku [WSC 2013]

Anti-Knight-and-Queen Sudoku [WSC 2013].png Source: 2013 WSC, Beijing. There is no specific reason to use N and Q rather than 8 or 9 beyond being familiar with Chess notation. The constraints are bespoke to certain symbols, rather than applying to all of them. In this respect, it is similar to Star...
by detuned
Sun 13 Jan, 2019 4:41 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Shape Sudoku
Replies: 0
Views: 1822

Shape Sudoku

Shape Sudoku [WSC 2012].png Source: WSC 2012, Kraljevica, but has also appeared in numerous other places. I've posted this example for completeness as several other related examples have already been placed, but the point here is that the placement of shapes, rather than numbers is the more importa...
by detuned
Sun 13 Jan, 2019 4:34 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Star Sudoku
Replies: 1
Views: 1735

Star Sudoku

Star Sudoku [WSC 2012].png
Star Sudoku [WSC 2012].png (96.76 KiB) Viewed 1735 times
Source: WSC 2012, also in 2007

This puzzle features cells that belong to only one "generalised rows" (n.b. it doesn't really make sense to talk about rows and columns for this kind of grid), and aren't crosschecked by another.
by detuned
Sun 13 Jan, 2019 4:23 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Sick Kropki Sudoku [WSC 2011]
Replies: 1
Views: 1816

Sick Kropki Sudoku [WSC 2011]

Sick Kropki [WSC 2011].png
Sick Kropki [WSC 2011].png (239.45 KiB) Viewed 1816 times
Source: WSC 2011, Eger

The interesting element of this puzzle is that the set of numbers to be placed is not given, and is up to the solver to determine
by detuned
Sun 13 Jan, 2019 12:43 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Three different questions?
Replies: 17
Views: 6842

Re: Three different questions?

Thanks for the post Fred. 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 ne...
by detuned
Sun 13 Jan, 2019 11:56 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Battleships sudoku [WPF Sudoku GP 2015]
Replies: 2
Views: 1884

Re: Battleships sudoku [WPF Sudoku GP 2015]

This seems to be in common with Sukaku actually, in that the constructor has given more thought to the rules than a simple hybrid. It's not clear to me whether this moves the solving experience towards or away from Sudoku however, I'd be interested to hear other views here.
by detuned
Sun 13 Jan, 2019 11:27 am
Forum: Puzzle Competitions
Topic: WPF Puzzle GP
Replies: 22
Views: 9520

WPF Puzzle GP

The 2019 season is up and running next weekend, but this instructions are already out. http://gp.worldpuzzle.org/sites/default ... nd1_IB.pdf

The first round is by India.

Main website is here: http://gp.worldpuzzle.org/content/puzzle-gp