June 03, 2011

Friday Puzzles #105

Firstly let me apologise for being absent the previous couple of Fridays. I have been out of the country on both occasions, the logistics being something terrible.

The first Friday was due to being in Beijing on Sudoku duty at the Beijing International Sudoku Tournament. Expect a full report later, but as something of a taster here are the final four puzzles as solved by Jan Mrozowski of Poland and Jakub Ondrousek of the Czech Republic. Jan was the runner up in the event, solving these 4 in a shade over 11 minutes – but Jakub took the crown with a total time of 10 minutes. Needless to say these are both breath taking performances, and whilst everything was broadcast to some Chinese sports channel, I’m not sure the viewers would have kept up – the commentary team of Chen Cen and Wei-Hwa Huang didn’t seem to…

BIST 2011 Final #1 – Sudoku

BIST 2011 Final #2 – Diagonal Sudoku

BIST 2011 Final #3 – Consecutive Sudoku

BIST 2011 Final #4 – Sudoku

[These were reconstructed from photos taken by Bastien Vial-Jaime – hopefully they are all good and typo-free but I haven’t actually had time to solve these myself to verify this is the case.]

With the quality of the puzzles being so high, I’m not sure that I am well advised in starting the first of my three legs of Friday Puzzles today with a sudoku, but there we go, it’s too late now. Enjoy!

#132 Sudoku – rated medium

Edit: Did anyone notice this was broken? I must have typoed a digit when transposing this over to inkscape!

All puzzles – except obviously the BIST puzzles – © Tom Collyer 2009-11

- 4 comments by 1 or more people Not publicly viewable

  1. term

    In #1, I suspect that R3C4 is 8 instead. As is, you can’t place 1 anywhere in box 8.

    03 Jun 2011, 14:17

  2. Ours brun

    Thanks for the credits, Tom. Unfortunately, some bad news : I just checked from my photos and there are a few mistakes in your images.
    - Classic #1 : the 1 in R9C7 should be an 8 (there is a 1 in R9C6, which could explain the mistake). As term just said.
    - Consecutive : three bars are missing : between R2C3 and R3C3, between R5C5 and R5C6, and between R9C7 and R9C8.
    Yes, I think that’s all ! :-)

    I could, but of course I will not, make some joke about the existing parallel between what you did in Beijing on BIST puzzles and what you just did on these… well, BIST puzzles. Something like “If only you had made only 4 mistakes during BIST”. But as I just said, I will not.


    03 Jun 2011, 14:23

  3. Bastien, you are a Gentleman and a Scholar. I am of course very pleased not to be reminded of those 8 wrong digits across 6 puzzles :)

    I will update the images now…

    03 Jun 2011, 14:28

  4. Ours brun

    I just noticed that term’s remark was about R3C4, not R9C7. The original puzzle does have a 1 in R3C4 and an 8 in R9C7 but, indeed, inverting these two digits leads to a valid puzzle too.


    03 Jun 2011, 14:28

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Welcome to the blog of current UKPA sudoku champion, two-time Times national sudoku champion and general logic puzzle fan Tom Collyer.

Home of the original Friday Puzzles, each Friday I publish a 100% original and handmade logic puzzle, inspired by the world-famous Nikoli company.

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