Search found 54 matches

by Feadoor
Wed 12 Jun, 2019 12:35 pm
Forum: Announcements
Topic: Results: 2019 UK Sudoku Championship
Replies: 6
Views: 4490

Re: Results: 2019 UK Sudoku Championship

Congratulations David on a triumphant return to the UKSC!
by Feadoor
Sun 02 Jun, 2019 9:56 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2019 / WSC Qualification
Replies: 11
Views: 6957

Re: UK Sudoku Championship 2019 / WSC Qualification

The instructions for Odd/Even Sudoku begin with the phrase "in each grid..." - does this mean there will be multiple grids, or is this a remnant from instructions originally written for a Linked 6x6?
by Feadoor
Wed 29 May, 2019 5:56 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 13247

Re: WPF Sudoku GP

Top 3 UK:

38. Sam Cappleman-Lynes 501
55. Tom Collyer 426
58. Jeremy Kong 416
by Feadoor
Wed 29 May, 2019 3:53 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 13247

Re: WPF Sudoku GP

The main thing is to narrow down the cells that can/cannot be the removed cell along a palindrome line. Work out which cells are the possible "mirror" cells along a line based on which cell is removed, and narrow down the possibilities based on which pairs can't contain equal values. That becomes ea...
by Feadoor
Wed 15 May, 2019 10:18 am
Forum: Puzzle Competitions
Topic: WPF Puzzle GP
Replies: 22
Views: 11084

Re: WPF Puzzle GP

For me, both a higher points total and a higher place in Puzzle GP 5 than in Sudoku GP 5. Alan did promise that joining the UKPA would turn me into a "proper" puzzler :lol:
by Feadoor
Tue 02 Apr, 2019 7:00 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 13247

Re: WPF Sudoku GP

Preliminary results should be ignored for the time being, as the points values showing as being awarded for each puzzle are still the points values from GP 3.
by Feadoor
Tue 19 Mar, 2019 11:45 am
Forum: Puzzle Competitions
Topic: WPF Puzzle GP
Replies: 22
Views: 11084

Re: WPF Puzzle GP

If you didn't do the Compass during the contest, I highly recommend it to be solved at your leisure. Beautiful puzzle.
by Feadoor
Fri 15 Mar, 2019 9:36 am
Forum: Puzzle Competitions
Topic: Sudoku Mahabharat - 2019
Replies: 12
Views: 8058

Re: Sudoku Mahabharat - 2019

I enjoyed the final remainder puzzle after time. During the contest I started with it, and thought I'd shown it had no solutions after 5 minutes, so moved onto the other puzzles, taking a few minutes between each one to see if I could spot my mistake with the remainders. Only realised after the cont...
by Feadoor
Wed 06 Feb, 2019 4:12 pm
Forum: Puzzle Competitions
Topic: Sudoku Mahabharat - 2019
Replies: 12
Views: 8058

Re: Sudoku Mahabharat - 2019

by Feadoor
Wed 06 Feb, 2019 11:21 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 13247

Re: WPF Sudoku GP

I knew Classic 5 was familiar to me! For those who have access, take a look at the final Classic from WSC 2017 Rd 5. Almost identical clue-layout, and the break-in step is the same as in that puzzle too, although less obvious here and not telegraphed as clearly. In that puzzle, the crucial digits al...
by Feadoor
Tue 05 Feb, 2019 9:48 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 13247

Re: WPF Sudoku GP

Top 3 UK Round 2 according to the preliminary results are: 45. Sam Cappleman-Lynes 491 96. Mark Goodliffe 382 101. Heather Golding 371 Only 12 all-correct finishers this time, compared to 28 for Round 1, so a step up in difficulty! And 19 solvers (including myself) who were able to solve everything ...
by Feadoor
Sat 19 Jan, 2019 11:02 am
Forum: Puzzle Competitions
Topic: Sudoku Mahabharat - 2019
Replies: 12
Views: 8058

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: 11
Views: 6130

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: 11
Views: 6130

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: 5632

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: 4848

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: 15268

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: 15268

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: 15268

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: 15268

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: 15268

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: 9858

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: 9858

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: 9858

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: 9858

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.