Search found 172 matches

by Fred76
Sat 05 Jan, 2019 5:02 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Searchdoku [WPF Sudoku GP 2013]
Replies: 0
Views: 3572

Searchdoku [WPF Sudoku GP 2013]

09 - searchdoku.png
09 - searchdoku.png (67.81 KiB) Viewed 3572 times
Source: http://www.worldpuzzle.org/files/35/WPF ... Leg_IB.pdf

The question is that most part of the puzzle can potentially be totally outside and not related to the sudoku.
by Fred76
Sat 05 Jan, 2019 4:58 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Halved square sudoku [WPF Sudoku GP 2013, WSC 2011]
Replies: 0
Views: 3415

Halved square sudoku [WPF Sudoku GP 2013, WSC 2011]

08 - halved square.png Source: http://www.worldpuzzle.org/files/35/WPF_Sudoku_GP_2013_Turkish_Leg_IB.pdf I think it is an interesting example, created for WSC 2011. There is no big difference with irregular sudoku, however some cells are divided in 2 and the solver must determine which part of the ...
by Fred76
Sat 05 Jan, 2019 4:53 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Snail Sudoku [WPF Sudoku GP 2013]
Replies: 0
Views: 3317

Snail Sudoku [WPF Sudoku GP 2013]

07 - snail sudoku.png
07 - snail sudoku.png (39.77 KiB) Viewed 3317 times
Source: http://www.worldpuzzle.org/files/35/WPF ... Leg_IB.pdf

similar question about blank cells in the solution than this one: viewtopic.php?f=33&t=1947
by Fred76
Sat 05 Jan, 2019 4:45 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Sudoku Islands [WPF Sudoku GP 2013]
Replies: 0
Views: 3296

Sudoku Islands [WPF Sudoku GP 2013]

06 - sudoku islands.png
06 - sudoku islands.png (39.95 KiB) Viewed 3296 times
Source: http://www.worldpuzzle.org/files/35/WPF ... Leg_IB.pdf

More than disconnected cells, I think the question here is about doubled digits in regions (similar to this one: viewtopic.php?f=33&t=1921)
by Fred76
Sat 05 Jan, 2019 4:41 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Top Heavy Sudoku [WPF Sudoku GP 2013]
Replies: 0
Views: 3238

Top Heavy Sudoku [WPF Sudoku GP 2013]

05 - top heavy.png
05 - top heavy.png (47.27 KiB) Viewed 3238 times
Source: http://www.worldpuzzle.org/files/35/WPF ... Leg_IB.pdf

Potential questions: Determining the position of several blank cells in the grid. Using them to add a new rule (top digit must be greater), which by itself should not be a problem.
by Fred76
Sat 05 Jan, 2019 4:34 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Logidoku [WPF Sudoku GP 2013]
Replies: 2
Views: 5290

Logidoku [WPF Sudoku GP 2013]

04 - logidoku.png
04 - logidoku.png (37.57 KiB) Viewed 5290 times
Source: http://www.worldpuzzle.org/files/35/WPF ... Leg_IB.pdf

Determining the value of letters can be a puzzle by itself that don't combine with sudoku.
by Fred76
Sat 05 Jan, 2019 4:29 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Seek and Spell sudoku [WPF Sudoku GP 2013]
Replies: 2
Views: 3701

Re: Seek and Spell sudoku [sudoku GP 2013]

detuned wrote:
Sat 05 Jan, 2019 4:25 pm
Hi Fred - could you post a link to the source of this puzzle please?
Done
by Fred76
Sat 05 Jan, 2019 4:27 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: One digit unique solution [WPF Sudoku GP 2013]
Replies: 0
Views: 3152

One digit unique solution [WPF Sudoku GP 2013]

03 - one digit unique solution.png Source: http://www.worldpuzzle.org/files/35/WPF_Sudoku_GP_2013_Turkish_Leg_IB.pdf Here we have to determine the value of a cell which will make the solution unique. The idea is easy to understand, but the concept is perhaps too far away. Kind of meta-puzzle about ...
by Fred76
Sat 05 Jan, 2019 4:19 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Seek and Spell sudoku [WPF Sudoku GP 2013]
Replies: 2
Views: 3701

Seek and Spell sudoku [WPF Sudoku GP 2013]

02 - seek and spell sudoku.png
02 - seek and spell sudoku.png (101.99 KiB) Viewed 3701 times
Source: http://www.worldpuzzle.org/files/35/uss ... ctions.pdf

This one is a bit similar to eightdirections sudoku already posted here: viewtopic.php?f=33&t=1925. I think it may be accepted or rejected for same reasons.
by Fred76
Sat 05 Jan, 2019 4:14 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Dynasty Sudoku [WPF Sudoku GP 2013]
Replies: 0
Views: 3265

Dynasty Sudoku [WPF Sudoku GP 2013]

01 - Dynasty sudoku.png Source: http://www.worldpuzzle.org/files/35/uss2013-instructions.pdf [While Tom concentrate on selecting puzzles from WSC, I'll propose a few ones from sudoku GP. I think I can't add poll, perhaps Tom will add polls to these threads.] This one has some similarities with star...
by Fred76
Sat 05 Jan, 2019 2:42 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 10804

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. The ones who are able to solve these hard classics (or even harder than the example ...
by Fred76
Thu 03 Jan, 2019 3:15 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 10804

Re: Very Hard Classic Sudoku [WSC 2010]

detuned wrote:
Thu 03 Jan, 2019 3:06 pm
[Unfortunately I do not have a copy of the 2009 puzzle]
http://www.szhk.sk/images/stories/dokum ... part_d.pdf
by Fred76
Thu 03 Jan, 2019 2:39 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 10804

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. This is a nice ideology, but impossible practically. The ones who are able to solve these hard classics (or even harder than the example posted here), will n...
by Fred76
Thu 03 Jan, 2019 9:57 am
Forum: WPF Sudoku Technical Discussion forum
Topic: READ ME FIRST: What is a Sudoku Committee
Replies: 28
Views: 26566

Re: READ ME FIRST: What is a Sudoku Committee

I don't see myself how (1) "What is a Sudoku?" is a question I have anything more to say about than the basic thoughts above. An Arrow Sudoku is not a sudoku. A Diagonal sudoku is not a sudoku. It has some cells with more than 3 unique placement constraints. They are at best Sudoku Variations. Than...
by Fred76
Fri 17 Nov, 2017 1:16 pm
Forum: General Puzzle Discussions
Topic: BBC Radio 4 - Puzzles for Today
Replies: 12
Views: 22066

Re: BBC Radio 4 - Puzzles for Today

No, the dead bees are not counted.

Here is a table of alive bees population at the end of the 20 first days of invasion:

Image

Fred
by Fred76
Fri 17 Nov, 2017 10:28 am
Forum: General Puzzle Discussions
Topic: BBC Radio 4 - Puzzles for Today
Replies: 12
Views: 22066

Re: BBC Radio 4 - Puzzles for Today

In case anyone doesn't want this spoiled, select the following text with your mouse... So there are 4 possible ages of bees: 0, 1, 2, or 3 days old - 4 years old would mark the end of a bee's 4th year, which is when we're told it dies. At the end of day t lets denote the numbers of those bees by a(...
by Fred76
Wed 15 Mar, 2017 9:07 am
Forum: Puzzle Competitions
Topic: 2017 Sudoku GP
Replies: 21
Views: 29415

Re: 2017 Sudoku GP

I'm sure it would have been possible to treat the "Czech" theme in a more varied way. Using the letters C, Z, E on 10 sudokus and the flag on 1 sudoku seems a bit reducing of what can offer this country... I would be pleasantly surprised if the mathdoku, fuzzy arrows and lonely number are also linke...
by Fred76
Tue 28 Feb, 2017 9:26 am
Forum: Puzzle Competitions
Topic: 2017 Puzzle GP
Replies: 41
Views: 49691

Re: 2017 Puzzle GP

I don't consider myself as a puzzle player, and I don't actually take part in the puzzle GP. So my below comment is in no case a criticism of the competition, or the format or this round or whatever. As a sudoku player, I'm curious to see what's happening in the puzzle world, basically because puzzl...
by Fred76
Sun 12 Feb, 2017 6:31 pm
Forum: Puzzle Competitions
Topic: UKPA Open Sudoku and Puzzle Tournament 2017
Replies: 20
Views: 28884

Re: UKPA Open Sudoku and Puzzle Tournament 2017

detuned wrote:2 Fortress Sudoku :(
:mrgreen:
by Fred76
Wed 11 Jan, 2017 8:21 pm
Forum: Puzzle Competitions
Topic: Competition for Newbies
Replies: 3
Views: 8193

Re: Competition for Newbies

Hi Ritu, At Logic Masters India there are some "Beginner's Sudoku" tests. Currently there is no such test running, but you can view (and solve) past competitions, e.g. http://logicmastersindia.com/BeginnersSudoku/ http://logicmastersindia.com/BeginnersSudoku/?B=BI&test=B201312 http://logicmastersin...
by Fred76
Fri 30 Oct, 2015 12:01 am
Forum: General Puzzle Discussions
Topic: Stuck with a Sudoku
Replies: 4
Views: 12320

Re: Stuck with a Sudoku

I'll add my 2 cents here. The 1rst trick I saw on this one was to use uniqueness technique on the 3 bottom regions. You have to place the 8 in R9C8, otherwise you'll have a big loop with digits 2, 4, 6 and 9 (in columns 1, 2, 6, 8) that would have 2 solutions. But colouring is fine, too, of course ;...
by Fred76
Fri 29 May, 2015 10:02 pm
Forum: Puzzle Competitions
Topic: Swiss Sudoku qualifiers
Replies: 1
Views: 6314

Swiss Sudoku qualifiers

from 12th to 15th June on LogicMastersDeutschland:

http://logic-masters.de/Wettbewerbe/wet ... .php?id=83

Please feel free to take part even if you don't have a swiss passport ;)

Fred
by Fred76
Wed 04 Mar, 2015 9:41 am
Forum: Puzzle Competitions
Topic: 2015 UK Open Sudoku and UK Open Puzzle Tournaments
Replies: 32
Views: 48498

Re: 2015 UK Open Sudoku and UK Open Puzzle Tournaments

Actually, there is a small mistake in round 3 of instructions booklet.

My name is Stalder, not Stadler. :D

I thought that this was a typical German mistake (lot of German people make this mistake), but not long ago Tawan made it, too.
So I should perhaps change my name :mrgreen:
by Fred76
Sat 14 Feb, 2015 12:07 am
Forum: Puzzle Links
Topic: Sudoku duel
Replies: 8
Views: 17447

Re: Sudoku duel

Special comments about Fred's suggestions. First version was based on keyboard input, but it makes playing on mobile devices impossible. So I changed it to mouse/touch. Keyboard input gives a huge advantage over mouse. So I don't want allow using keyboard right now because in this case we should cr...
by Fred76
Fri 13 Feb, 2015 12:02 pm
Forum: Puzzle Links
Topic: Sudoku duel
Replies: 8
Views: 17447

Re: Sudoku duel

Who is Fred77 :?: Is it my update? :lol: IThe obvious improvements the site needs are: - show how many / who is online - chat. Maybe that's too much, but even just a button to say "Thanks for the games but I must go now". I would add one thing: -Having a new mode of entering digits: with keyboard/nu...