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UKPA Sudoku Championship 2013 (On-line event)

Posted: Fri 26 Apr, 2013 2:42 pm
by puzzlemad
The UKPA are pleased to announce that the UK Sudoku Championship will take place over the weekend of 10th - 13th May, 2013.

The top three UK competitors will earn their places on the UK team for the World Sudoku Championships that will be held in China in October 2013.

For more information about how to qualify please see http://forum.ukpuzzles.org/viewtopic.php?f=8&t=835

The tournament will also double as the UK leg of the WPF Sudoku Grand Prix.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Fri 26 Apr, 2013 7:54 pm
by detuned
Instructions will be published on Sunday!

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Sun 28 Apr, 2013 7:18 pm
by detuned
The contest page is live: http://www.ukpuzzles.org/contests.php?contestid=30
The instructions can be found here: http://www.ukpuzzles.org/file_download. ... 8fbf2aa047

ERRATA FOR INSTRUCTIONS VERSION 1:
1. There should be a vertical bar between cells R2C2 and R2C3 in the example puzzle for 12. Consecutive Sudoku.
2. The clue in the cage at R3C9 should be 11 in the example puzzle for 9. Killer Sudoku.
3. The example puzzle for 4. Deficit Sudoku has multiple solutions. See here for a new Deficit Sudoku.
4. The clue in the cage at R1C8 should be 20 in the example solution for 9. Killer Sudoku.

These have been corrected in version 2 of the instructions.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Sun 28 Apr, 2013 8:19 pm
by Nilz
Looks good. :)
Spotted a typo though: In the answer key section, it says rows should be read from right to left- I presume this should be left to right (as borne out by the answer given).

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Sun 28 Apr, 2013 8:28 pm
by detuned
Wow that's incredibly stupid... err I mean just checking you were reading the important bits :)

Yes that should definitely read left to right - i've just updated that.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Mon 29 Apr, 2013 1:10 pm
by tojejedno
I printed the Instruction Booklet and when I was trying to solve the Diagonal Sudoku, I realized, that the diagonals are not printed. I checked the PDF and there I found them marked. I do not know, why it is not printed when it is shown, but I would be very pleased if you were able to fix it. (If you were able to fix it, please, tell me how - the same problem occurs in one of the Czech competitions and we do not know, what is wrong.)

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Mon 29 Apr, 2013 6:58 pm
by detuned
tojejedno wrote:I printed the Instruction Booklet and when I was trying to solve the Diagonal Sudoku, I realized, that the diagonals are not printed. I checked the PDF and there I found them marked. I do not know, why it is not printed when it is shown, but I would be very pleased if you were able to fix it. (If you were able to fix it, please, tell me how - the same problem occurs in one of the Czech competitions and we do not know, what is wrong.)
Is this an issue only with the diagonal puzzle? How do the lines look for arrow and palindrome?

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Mon 29 Apr, 2013 8:25 pm
by karzym
Is it possible to make border lines a little bit thicker (especially in the irregular sudokus)?

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Mon 29 Apr, 2013 9:54 pm
by detuned
karzym wrote:Is it possible to make border lines a little bit thicker (especially in the irregular sudokus)?
It is possible and I did notice this issue with the instructions myself, although I'm fairly sure that the thin borders for the example puzzles are an unfortunate artefact of scaling the puzzles sizes down. In theory the borders should be 3x the width of the gridlines. This is the same as I've used to publish puzzles for many years and has always been sufficient. Thicker than that comes down to personal taste - I've had both kinds of feedback over the years. Yes it makes things clearer or no it becomes too distracting.

Anyhow, the instruction borders for whatever reason don't appear to have printed at a 3:1 ratio (although I encourage you to zoom in using your PDF viewer!) Let me assure you that the borders on the full sized puzzles I have printed look fine to me.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Tue 30 Apr, 2013 11:20 am
by karzym
Thanks for explanation.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Tue 30 Apr, 2013 8:55 pm
by greenhorn
I think that it is irrelevant, but Deficit sudoku probably has more solutions and one clue in Killer is wrong (however solution contains correct clue). Beside that I want to ask whether there will be only two linked classics (nr. 1) and whether the sizes of puzzles nr. 3, 4, 5 will be same as in examples. Looking forward to the contest.
Matus

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Tue 30 Apr, 2013 9:18 pm
by detuned
greenhorn wrote:I think that it is irrelevant, but Deficit sudoku probably has more solutions and one clue in Killer is wrong (however solution contains correct clue). Beside that I want to ask whether there will be only two linked classics (nr. 1) and whether the sizes of puzzles nr. 3, 4, 5 will be same as in examples. Looking forward to the contest.
Matus
I'll update the killer clue in the errata, and perhaps update the deficit puzzle if necessary. Thanks Matus!

To answer your questions: all competition puzzles are the same format and grid size as in the example puzzles. So Surplus and Deficit (puzzles 3 & 4) are 7x7, and Odd-Even-Big-Small (puzzle 5) is 8x8. Additionally, there are two linked 6x6 grids for puzzle 1. Although more is a nice idea for another time. Hope that helps!

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Tue 30 Apr, 2013 9:28 pm
by greenhorn
Thank you, Tom. It helps me a lot. It is much better to know how the real competition will look like.
I hope that correct example puzzles always help the inexperienced players not to doubt about theirs solving skills.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Wed 01 May, 2013 1:05 am
by detuned
I found (at least) two solutions to the deficit puzzle in the instructions, so I decided to make a new puzzle. It's quite late now but I've gone through this about 4 times and I'm fairly sure this one is safe. It's nearly as good as the competition puzzle ;)
deficit.pdf
(7.2 KiB) Downloaded 912 times
I will upload a revised version of the instructions at the weekend.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Wed 01 May, 2013 8:21 am
by david mcneill
Still haven't finished the booklet but worth pointing out that there is a bar missing in the Consecutive in the second row between cells 2 and 3. In the Killer, the top 2-cell cage in the right-hand column should have a total of 11 The top right 4-cell cage is correct in the puzzle but the total is misprinted in the solution. Glad that you've spotted the multiple solutions to the Deficit. Some of these examples are really hard, but the Odd was a very rewarding solve.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Wed 01 May, 2013 10:42 am
by detuned
David - I've added the misprinted killer solution to the errata here - we've already spotted everything else. Sadly I can't make that any more prominent but like I say I'll upload a corrected version of the instructions this weekend. If you find anything else I'll be really grateful if you let me know.

I'll be honest and say that I haven't really tested the instructions puzzles - the majority are either old competition puzzles or else lifted from my blog. I think it was the two 7x7 puzzles and the linked 6x6 that the examples had to be made from scratch. After writing competition puzzles, motivation for writing new puzzles for the instructions is somewhat low and so basically I fall back on the pool of previously written puzzles (or else I beg Gareth for some!)

Anyhow, perhaps it's worth reiterating that some of the example puzzles will be harder than the corresponding competition puzzles, and some will be easier, and sometimes the disparity is quite big.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Thu 02 May, 2013 5:50 am
by puzzlemad
Please all be aware that I've moved this topic into the "Competitions" section as that seemed more appropriate for the comments. I believe that there will be a shadow in the "Announcements" section so that all comments in either will be captured.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Thu 02 May, 2013 10:35 am
by tojejedno
Is this an issue only with the diagonal puzzle? How do the lines look for arrow and palindrome?
Yes, other lines are printed correctly.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Fri 03 May, 2013 12:51 am
by detuned
The diagonal lines are the same colour as the arrow/palindrome lines. The two differences are that the diagonal lines are thinner and that they are dashed - otherwise they were produced identically. At this stage my opinion is that it's probably a printer issue where the printer doesn't understand dashed lines and so doesn't know what to print.

I will prepare a test page in the same format of the puzzle booklet later, and if necessary some test files to see if we can definitely identify the issue.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Fri 03 May, 2013 5:31 pm
by emma
I've come across problems with pdfs not printing as seen on-screen when printed direct from Firefox - saving them and then opening with Acrobat gets around this. It may not be the same glitch, but may be worth a try.

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Fri 03 May, 2013 8:38 pm
by detuned
Ok - here's a test file with the same format as the competition puzzles. I suppose I'd expect 1 to have the same problem, 2 to be ok, and who knows with 3-5... :roll:
testing.pdf
(73.13 KiB) Downloaded 963 times

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Sun 05 May, 2013 1:59 pm
by Kodyn
Try to practice on UK WPF Sudoku Grand Prix!

In our Daily League we are preparing for you these sudoku variants:
06.05.2013 - XV Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)
07.05.2013 - Diagonal Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)
08.05.2013 - Thermo Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)
09.05.2013 - Deficit Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)
10.05.2013 - Killer Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)
11.05.2013 - Surplus Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)
12.05.2013 - Palindrome Sudoku (practice on WPF Sudoku Grand Prix — UK Sudoku Championship)

http://sudokucup.com/node/1901?typ=varianty

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Sun 05 May, 2013 4:05 pm
by tojejedno
detuned wrote:Ok - here's a test file with the same format as the competition puzzles. I suppose I'd expect 1 to have the same problem, 2 to be ok, and who knows with 3-5... :roll:
testing.pdf
I tried printing the testing version and probably found the problem - in the testing PDF everything was printed correctly. Then I tried once more printing the IB and I realized, that when it is printed from net page, the dashed lines disappear, when it is printed from downloaded PDF (from my PC), lhe lines are OK.
I expect that the competition puzzle booklet will be printed from downloaded PDF, so the problem is solved.
Thanks for your time!

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Sun 05 May, 2013 5:37 pm
by detuned
No problem, I'm glad we have identified the error!

As promised, I have updated the instructions to reflect the errata posted above. These changes were minor. Version 2 can be found here:

http://www.ukpuzzles.org/file_download. ... 8fbf2aa047

Re: UKPA Sudoku Championship 2013 (On-line event)

Posted: Fri 10 May, 2013 11:02 am
by detuned
IMPORTANT ANNOUNCEMENT REGARDING EARLY FINISHING BONUSES

After some consideration, a partial bonus system will be in force for this competition. Solvers who finish early with 15/16 correct answers will score a partial bonus of 1 point for each 30 seconds saved (equivalent to 1/3 of the finishing bonus rate). The partial bonus will be capped so that the maximum score achievable with the partial bonus is the championship total: 720 points.