UK Sudoku Championship 2019 / WSC Qualification

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detuned
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UK Sudoku Championship 2019 / WSC Qualification

Post by detuned » Sat 27 Apr, 2019 2:45 pm

This is the discussion thread for the 2019 UK Sudoku Championship. It will also act as the second qualifier for the UK A team competing at the World Sudoku Championships in Kirchheim, Germany to be held on the 29th September - 6th October 2019 (note that these dates also include time for the World Puzzle Championships).

Duration: 2 hours
Dates: Friday 7th - Monday 10th June 2019
Contest Page: http://www.ukpuzzles.org/contests.php?contestid=49
Instruction Booklet: http://ukpuzzles.org/file_download.php? ... 5b7a35c1a7

Please post any questions about the competition here.

detuned
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by detuned » Mon 13 May, 2019 4:20 pm

Simon's been doing some cracking the cryptic video's that might be helpful - this one covers last year's Thermo Sudoku

https://www.youtube.com/watch?v=RRSFXCpBBek

pinkagape
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by pinkagape » Sun 19 May, 2019 5:35 pm

Has there been any date set for the Puzzles?

detuned
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by detuned » Mon 20 May, 2019 10:18 pm

It’s usually a couple of weeks afterwards (as a rule of thumb we aim for 2nd and 4th weekends in June), but I’ll leave Liane to confirm

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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by detuned » Sun 02 Jun, 2019 8:29 pm

Instructions with points distributions are now available:

http://ukpuzzles.org/file_download.php? ... 5b7a35c1a7

Feadoor
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by Feadoor » Sun 02 Jun, 2019 9:56 pm

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?

detuned
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by detuned » Mon 03 Jun, 2019 1:33 pm

Feadoor wrote:
Sun 02 Jun, 2019 9:56 pm
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?
Yeah I'll fix that. To be absolutely clear, Puzzle #1 is a single 6x6 grid with Odd Sudoku rules, and Puzzle #2 is a single 6x6 grid with Even Sudoku rules.

Feadoor
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by Feadoor » Wed 10 Jul, 2019 3:54 pm

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 which way round the 2/8 pair in the second column goes resolves it fairly quickly but I'm looking for a "proper" way of doing it.


OEBS.PNG
OEBS.PNG (83.59 KiB) Viewed 290 times

rakesh_rai
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by rakesh_rai » Wed 10 Jul, 2019 4:16 pm

r3c12 will be the same as r4c56. So only one place for 7 in c5 which is r5c5.

Feadoor
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by Feadoor » Wed 10 Jul, 2019 5:16 pm

Thanks! I'd even already made the equivalent deduction with the odd/even clues in R34...

Feadoor
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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by Feadoor » Wed 10 Jul, 2019 6:29 pm

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!

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Re: UK Sudoku Championship 2019 / WSC Qualification

Post by detuned » Wed 10 Jul, 2019 9:10 pm

It always makes me very sad to see OEBS presented without the kanji characters - I don't know why :(

It's fair to say the solving path for these puzzles can end up being quite linear. I did enjoy playing with the partition trick in rows 3 and 4 though!

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