Search found 50 matches

by Feadoor
Thu 12 Sep, 2019 8:32 am
Forum: WPF Sudoku Technical Discussion forum
Topic: What is a Sudoku? Report general consultation
Replies: 9
Views: 479

Re: What is a Sudoku? Report general consultation

Tom, this is fantastic work - thank you. The pragmatic approach you propose makes a lot of sense to me, and I hope the WPF will take a similar view of it. On an initial reading, some points jumped out to me as perhaps needing an edit or some extra clarification. 1) "Cells must have a finite number o...
by Feadoor
Wed 24 Jul, 2019 1:41 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

Seeing a finned swordfish in a competitive scenario is highly impressive. Some would say "pointless", or "a waste of time". I know that a lot of solvers don't think that such logic has a place in speedsolving. But I've made the argument before that there are specific types of (finned) fish that are...
by Feadoor
Wed 24 Jul, 2019 6:16 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

Here you go James: viewtopic.php?f=5&t=1697
by Feadoor
Tue 23 Jul, 2019 1:00 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

I agree with you that the symmetric products sums is an awful variant, but its inclusion in this round was great for me. I must have looked in the right places very quickly because even though it was a 70+ pointer, I got it done in under 5 minutes. I also found a sneaky deduction on the Odd-Even whi...
by Feadoor
Tue 23 Jul, 2019 10:29 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

Preliminary results for Round 8: 13. Sam Cappleman-Lynes 721.7 44. Tom Collyer 525 60. Jeremy Kong 435 Leaving the top 3 UK in the final standings as: 29. Sam Cappleman-Lynes 3193.7 50. Tom Collyer 2805 66. Jeremy Kong 2504 ----------------------------------------------------------------------------...
by Feadoor
Mon 15 Jul, 2019 3:21 pm
Forum: Puzzle (incl. Sudoku) Rules & Tips
Topic: Arrows
Replies: 6
Views: 1354

Re: Arrows

Thanks Freddie and James, In a sense, I suppose that means the dismaying answer (on the whole) is that I'm not missing any amazing tricks - the techniques are roughly the ones I'm already using, I'm just not very good at them. Except that 5x5 trick which is nice to have in the back pocket! James, th...
by Feadoor
Sat 13 Jul, 2019 5:09 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

Feadoor wrote:
Thu 11 Jul, 2019 6:34 am
I'd need to attain a new high score of 528 on Round 8 to break 3000 points.
So that means I can leave the awkward-looking symmetric product sum puzzle alone and "just" do everything else.

Shame there's also a medium nonconsecutive or I'd give this plan a go!
by Feadoor
Fri 12 Jul, 2019 2:50 pm
Forum: Puzzle Competitions
Topic: The Times Sudoku Championship 2019 (or not)
Replies: 3
Views: 863

Re: The Times Sudoku Championship 2019 (or not)

Full text of my email is as follows; Good afternoon, I am writing with regard to The Times Sudoku Championship, which you have attended in previous years. Following a review of this event, I regret to say that we have decided to discontinue the Sudoku Championship and, consequently, the event will n...
by Feadoor
Fri 12 Jul, 2019 8:42 am
Forum: Puzzle (incl. Sudoku) Rules & Tips
Topic: Arrows
Replies: 6
Views: 1354

Arrows

This section of the forum isn't too active, but hopefully I'll get some replies! So, some questions about Arrows puzzles: 1. How do you solve them? 2. How do you solve them quickly? 3. Any useful notation? I've attached an image of my solved copies of the two Arrows from this year's GP. The first I ...
by Feadoor
Thu 11 Jul, 2019 6:49 pm
Forum: Puzzle Competitions
Topic: The Times Sudoku Championship 2019 (or not)
Replies: 3
Views: 863

The Times Sudoku Championship 2019 (or not)

I've just received an email saying that the Times Sudoku Championship has been discontinued, and as such will not run this year.

Shame.
by Feadoor
Thu 11 Jul, 2019 6:34 am
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

A second-worst round of 449 means I'd need to attain a new high score of 528 on Round 8 to break 3000 points. It's possible - I've had 3 scores of over 500 points already.
by Feadoor
Wed 10 Jul, 2019 6:29 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2019 / WSC Qualification
Replies: 11
Views: 3884

Re: UK Sudoku Championship 2019 / WSC Qualification

Or alternatively spot that the 2s in box 4 eliminate it from the rest of C5 which gets you through the rest of the puzzle without ever needing to spot the trick in rows 3 and 4.

I guess I had about of a blind spot with this puzzle!
by Feadoor
Wed 10 Jul, 2019 5:16 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2019 / WSC Qualification
Replies: 11
Views: 3884

Re: UK Sudoku Championship 2019 / WSC Qualification

Thanks! I'd even already made the equivalent deduction with the odd/even clues in R34...
by Feadoor
Wed 10 Jul, 2019 3:54 pm
Forum: Puzzle Competitions
Topic: UK Sudoku Championship 2019 / WSC Qualification
Replies: 11
Views: 3884

Re: UK Sudoku Championship 2019 / WSC Qualification

After the contest, I've had a go at re-solving all of the puzzles in order to better appreciate them without time pressure, and have a go at finding a logical solving path to those that I guessed on. So does anyone know how to solve the Odd-Even-Big-Small logically? I'm at this point, and guessing w...
by Feadoor
Wed 10 Jul, 2019 3:01 pm
Forum: Puzzle Competitions
Topic: WPF Puzzle GP
Replies: 22
Views: 6759

Re: WPF Puzzle GP

The preliminary results are supposedly out, but I would take them with a pinch of salt, because the points attributed to each puzzle, in most cases, do not match the points values from the instruction booklet... :roll:
by Feadoor
Mon 01 Jul, 2019 10:08 am
Forum: Puzzle Competitions
Topic: WPF Puzzle GP
Replies: 22
Views: 6759

Re: WPF Puzzle GP

Round 7 will happen this weekend and the Czech and Slovak authors appear to have prepared a themed round - only 7 distinct puzzle types, but each one appears three times in standard, isometric and hexagonal variants.

https://gp.worldpuzzle.org/content/inst ... -booklet-2
by Feadoor
Wed 26 Jun, 2019 6:36 pm
Forum: Puzzle Competitions
Topic: WPF Sudoku GP
Replies: 28
Views: 7399

Re: WPF Sudoku GP

Round 7 happened at the weekend. Top 3 UK:

42. Sam Cappleman-Lynes 449
72. Tom Collyer 367
94. Matthew White 335

I thought that was a hard round, especially the Sum by X and Renban puzzles.
by Feadoor
Fri 14 Jun, 2019 9:03 am
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2019 / WPC Qualification
Replies: 18
Views: 4517

Re: UK Puzzle Championship 2019 / WPC Qualification

And one tip for anyone who thinks they'll struggle to calculate the area of an angled rectangle for the Shakashaka answer key, there's no need to count up triangles! Count the number of diagonal units along each of a pair of sides, calculate the area as if they were the actual side lengths, then dou...
by Feadoor
Fri 14 Jun, 2019 8:35 am
Forum: Puzzle Competitions
Topic: UK Puzzle Championship 2019 / WPC Qualification
Replies: 18
Views: 4517

Re: UK Puzzle Championship 2019 / WPC Qualification

Thanks Liane! I'll kick off the questions... - There are conflicting lengths of time for the contest. Most places say 2.5 hours, but the "Points and Bonuses" section of the instructions says "the allotted two hours" and the contest page itself says "3 hours". - In Pentopia the instructions suggest t...
by Feadoor
Wed 12 Jun, 2019 9:05 pm
Forum: Announcements
Topic: Results: 2019 UK Sudoku Championship
Replies: 6
Views: 2125

Re: Results: 2019 UK Sudoku Championship

And on behalf of everyone I'm sure, huge thanks to you Tom for putting together another Championship of very high quality!
by Feadoor
Wed 12 Jun, 2019 6:45 pm
Forum: Announcements
Topic: Results: 2019 UK Sudoku Championship
Replies: 6
Views: 2125

Re: Results: 2019 UK Sudoku Championship

detuned wrote:
Wed 12 Jun, 2019 6:18 pm
This is the first year by my reckoning where we've had two UK finishers - it doesn't happen all that often and it's a great achievement to pull it off.
2017 would like a word... https://ukpuzzles.org/final-results.php ... &country=1
by Feadoor
Wed 12 Jun, 2019 12:35 pm
Forum: Announcements
Topic: Results: 2019 UK Sudoku Championship
Replies: 6
Views: 2125

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: 3884

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: 7399

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: 7399

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...