Search found 162 matches

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: 2250

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: 2250

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: 2250

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: 4687

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: 8611

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: 8611

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: 15213

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: 22785

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: 14490

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: 4280

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: 7518

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: 3851

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: 28162

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: 10936

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: 10936

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...
by Fred76
Wed 05 Nov, 2014 7:01 pm
Forum: General Puzzle Discussions
Topic: Sudoku Classic
Replies: 11
Views: 11843

Re: Sudoku Classic

yes Mr Fred, this has several solution, but this is important that you will choose the better solution. The better solution is the same 1 solution, because in some of cells(4 cells) there are pair shared value, but 1 of those cells has 3 digit and we must the digit that is difference with pair numb...
by Fred76
Wed 05 Nov, 2014 12:15 pm
Forum: General Puzzle Discussions
Topic: Sudoku Classic
Replies: 11
Views: 11843

Re: Sudoku Classic

It has several (5) solutions :o

Fred
by Fred76
Wed 14 May, 2014 9:08 am
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2014
Replies: 10
Views: 10284

Re: UK Sudoku Championship 2014

Thank you Tom for this wonderful tournament !
I appreciated every puzzle in this contest.

I look forward to solve your sudokus during the next WSC :D

Fred
by Fred76
Tue 18 Mar, 2014 8:16 pm
Forum: Puzzle Competitions
Topic: 2014 WPF Sudoku Grand Prix
Replies: 19
Views: 13513

Re: 2014 WPF Sudoku Grand Prix

Puzzles not quite as easy as I suspected the experts would have found them - only 6 finished all-correct, but note Kota beating 2nd place (Rishi) by over 10 minutes! 20 players solved all sudokus without mistake. 2 players also solved all sudoku, but with one mistake. Yes, Kota was very impressive....
by Fred76
Wed 19 Feb, 2014 11:50 pm
Forum: Puzzle Competitions
Topic: 2014 WPF Sudoku Grand Prix
Replies: 19
Views: 13513

Re: 2014 WPF Sudoku Grand Prix

I'm glad I managed to go error free this time, but in good practice I really ought to have finished all of it in time. I also ought to have submitted a dummy answer for the 90 point puzzle - was never going to get that done in 6 minutes I think, but the partial bonus that wrong answer would have gi...
by Fred76
Thu 23 Jan, 2014 12:26 pm
Forum: Puzzle Competitions
Topic: 2014 WPF Sudoku Grand Prix
Replies: 19
Views: 13513

Re: 2014 WPF Sudoku Grand Prix

NikolaZ wrote:Yes, I missed that rule :cry: .
oops :!:
by Fred76
Fri 31 May, 2013 10:07 pm
Forum: Puzzle Competitions
Topic: Swiss qualification Sudoku tournement
Replies: 2
Views: 3689

Re: Swiss qualification Sudoku tournement

The tournament has started.
Good luck !
by Fred76
Thu 21 Mar, 2013 12:03 am
Forum: Puzzle Competitions
Topic: UK Open Sudoku and Puzzle Tournament 16th - 17th March, 2013
Replies: 36
Views: 29031

Re: UK Open Sudoku and Puzzle Tournament 16th - 17th March,

puzzlemad wrote:Puzzle Booklets are now available.
Enjoy :D
Thanks for sharing these booklets :D !
by Fred76
Mon 28 Jan, 2013 7:25 pm
Forum: Announcements
Topic: WPF Sudoku GP - Round 1 : 25-27 Jan 2012
Replies: 10
Views: 12446

Re: WPF Sudoku GP - Round 1 : 25-27 Jan 2012

I am still surprised to note how people living on the same planet as me can storm through such a set of puzzle so quickly. Don't be surprised, it was an interplanetary contest: for example: Kwak, Zuffranieri and Seshadri come from saturn. The 3 best players Vunk, Mrozowski and Ondrousek live farthe...
by Fred76
Wed 28 Nov, 2012 11:27 pm
Forum: Puzzle Links
Topic: croco-puzzle
Replies: 696
Views: 443007

Re: croco-puzzle

The # feature works fine for me for the skyscrapers/sudokus/kropkis, but I have another problem:
I find it even more useful to write 2 candidates on a cell using simply the key "-", which seems to work on skyscrapers/sudoku, but not on the kropki.

Is it idelibarate or did I miss something?

Fred