Search found 18 matches

by Feadoor
Sat 19 Jan, 2019 11:02 am
Forum: Puzzle Competitions
Topic: Sudoku Mahabharat - 2019
Replies: 4
Views: 821

Re: Sudoku Mahabharat - 2019

I had a bit of a nightmare for this one. Despite getting the tricky start on Unordered Pairs I somehow missed the existence of one of the other clues and had to make a guess after being stuck for a long time. Coded Pairs felt arduous and I managed to break the Fortress twice before eventually solvin...
by Feadoor
Tue 15 Jan, 2019 1:35 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 10
Views: 307

Re: Disjoint regions sudoku [new example]

I think, even if this puzzle could be presented in a way that made the regions clear, I would argue against its inclusion on the grounds that it is entirely equivalent to classic sudoku and this presentation of classic sudoku amounts to nothing more than a gimmick.
by Feadoor
Tue 15 Jan, 2019 12:12 pm
Forum: WPF Sudoku Technical Discussion forum
Topic: Disjoint regions sudoku [new example]
Replies: 10
Views: 307

Re: Disjoint regions sudoku [new example]

This variant (with these exact regions) is pointless, because it's completely equivalent to classic sudoku. Take the yellow cells as the top-left 3x3 box of a classic, the red cells as the top-middle, the green cells as the top-right, the pink cells as the middle-left etc. Then all cells which were ...
by Feadoor
Thu 03 Jan, 2019 10:10 am
Forum: WPF Sudoku Technical Discussion forum
Topic: Very Hard Classic Sudoku [WSC 2010]
Replies: 10
Views: 1016

Re: Very Hard Classic Sudoku [WSC 2010]

(Throughout this post, "standard solving techniques" refers to singles, line-box interactions (pointing/claiming) pairs, triples, quads, X-Wings, swordfish and jellyfish) In my oppinion, someone who claims to be a sudoku champion should be able to solve all 9x9 standard sudokus, even with quite diff...
by Feadoor
Tue 09 Oct, 2018 8:08 am
Forum: Puzzle Competitions
Topic: LMI contest: Sudoku Deja Vu
Replies: 3
Views: 1139

Re: LMI contest: Sudoku Deja Vu

Aside from my frustration (at myself!) for being extremely slow to spot the Deja Vu rules (I spent approximately 30 of the 90 minutes not actually solving sudoku...), thank you David for some lovely puzzles and a fun contest! I'm especially impressed by how the Deja Vu concept didn't detract at all ...
by Feadoor
Tue 26 Jun, 2018 10:31 pm
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2018 / WPC Qualification
Replies: 18
Views: 5381

Re: UK Puzzle Championship 2018 / WPC Qualification

Hi Adam, Aside from some obvious initial moves, the starting point I used for the Fillomino during the contest was to count the given 4s. There are plenty of them, and only 5 possible different shapes. You can work out which ones connect, and make some deductions about which shapes can or cannot go ...
by Feadoor
Wed 20 Jun, 2018 8:17 pm
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2018 / WPC Qualification
Replies: 18
Views: 5381

Re: UK Puzzle Championship 2018 / WPC Qualification

I also found the mirror terminology confusing. In my reading of the rules, I think you can, instead of thinking about mirrors, simply say that the "mirror clues" refer to the number of intersections at which the laser turns instead of going straight. This includes at the boundary of the grid. The on...
by Feadoor
Tue 19 Jun, 2018 3:11 pm
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2018 / WPC Qualification
Replies: 18
Views: 5381

Re: UK Puzzle Championship 2018 / WPC Qualification

One additional question from me: in Set Square, will the numbers outside the grid necessarily be integers? If so, is it valid for intermediate results to be non-integer (e.g. 2 / 6 * 3 = 1)?
by Feadoor
Sat 16 Jun, 2018 5:14 pm
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2018 / WPC Qualification
Replies: 18
Views: 5381

Re: UK Puzzle Championship 2018 / WPC Qualification

Am I missing something in the rules for Fillomino (Different Shapes)? The example puzzle seems not to have a unique solution - one can replace the 4 and 3 polyominoes from the lower-left corner of the given solution with a single 7 polyomino without appearing to break any of the constraints. I think...
by Feadoor
Sat 16 Jun, 2018 8:49 am
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2018 / WPC Qualification
Replies: 18
Views: 5381

Re: UK Puzzle Championship 2018 / WPC Qualification

There's currently a discrepancy for the points value of the Shikaku between the instruction booklet (15pts) and the answer page (14pts).
by Feadoor
Wed 13 Jun, 2018 4:19 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2018 / WSC Qualification
Replies: 11
Views: 3855

Re: UK Sudoku Championship 2018 / WSC Qualification

Thanks very much! When I submitted the Thermo Sudoku with 15 seconds remaining, I didn't realise just how important it would be!
by Feadoor
Mon 11 Jun, 2018 8:48 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2018 / WSC Qualification
Replies: 11
Views: 3855

Re: UK Sudoku Championship 2018 / WSC Qualification

The password is on the answer submission page - it will be revealed when you press "Start Contest".
by Feadoor
Thu 07 Jun, 2018 2:31 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2018 / WSC Qualification
Replies: 11
Views: 3855

Re: UK Sudoku Championship 2018 / WSC Qualification

As regards the bonus points, am I correct in my understanding that a solver who submits correct solutions to 15 puzzles and also makes a random guess at the 16th will score the partial bonus of 2 points per minute saved, but a solver who submits 15 correct puzzles and makes no attempt at the 16th wi...
by Feadoor
Thu 07 Jun, 2018 9:18 am
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2018 / WSC Qualification
Replies: 11
Views: 3855

Re: UK Sudoku Championship 2018 / WSC Qualification

The link to this thread from the contest page is currently broken - there's an incorrectly-escaped ampersand in the URL.
by Feadoor
Mon 28 May, 2018 1:39 am
Forum: Welcome!
Topic: Hello from a long-time enthusiast!
Replies: 4
Views: 1831

Re: Hello from a long-time enthusiast!

Excellent resources - thank you! I can see that there's a whole world out there to be discovered...
by Feadoor
Sat 26 May, 2018 8:40 pm
Forum: Welcome!
Topic: Hello from a long-time enthusiast!
Replies: 4
Views: 1831

Re: Hello from a long-time enthusiast!

Thanks for your welcome, Alan! I'm very glad to hear that there are plenty of competitions happening all the time. Are details of them often posted in this forum, or is there a handy list of places to look?
by Feadoor
Fri 25 May, 2018 12:07 am
Forum: Welcome!
Topic: Hello from a long-time enthusiast!
Replies: 4
Views: 1831

Hello from a long-time enthusiast!

Well, hello there! My name is Sam, and I've been solving Sudoku in one form or another since I, like many, found one in a newspaper in 2005 and got hooked. I'm a total stereotype - a geeky computer programmer with a maths degree who loves Sudoku - so feel free to blame me and my ilk for some of the ...
by Feadoor
Wed 23 May, 2018 9:43 pm
Forum: Announcements
Topic: UK Puzzle & Sudoku National Championships 2018
Replies: 6
Views: 3640

Re: UK Puzzle & Sudoku National Championships 2018

Thanks to all involved in running these competitions! I'll be a first-time Sudoku entrant this year, the previous two contests having unfortunately fallen during weekends when I was on holiday or disconnected from the internet. I've immensely enjoyed the puzzles from previous years and look forward ...