All 16 entries tagged Sudoku

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January 20, 2012

Friday Puzzles #140

Tom Collyer writes another easy sudoku? Perhaps I’m not the best judge any more, but it’s certainly not hard. Enjoy!

#171 Sudoku – rated easy

[blockquote mark-up still apparently not working]

All puzzles © Tom Collyer 2009-12


October 07, 2011

Friday Puzzles #125

I’ve been at a wedding and will busy until at least Sunday. I’m afraid it’s more delays. In other news, I’m considering a career managing the the West Coast mainline.

EDIT

OK, here we go. Tom Collyer writes another easy sudoku. But not trivially so. Enjoy!

#155 Sudoku – rated easy

[blockquote mark-up still apparently not working]

All puzzles © Tom Collyer 2009-11


September 16, 2011

Friday Puzzles #122

Wow – an entry on time? Who’d have thought it?

This Sudoku puzzle felt like more of a medium last night, but I think it’s probably like most of my other Sudoku puzzles, disappointingly easy. Anyway, I think this is a great grid pattern and it solves very cleanly indeed.

Good luck to anyone coming down to London tomorrow for the Times “Su Doku” championship – I shall be doing my best to not make any stupid mistakes, again.

There are also a multitude of other competitions going on this weekend too, this time on the interwebs. Maybe I’ll be able to squeeze some time in this weekend to replace my printer cartridge? Maybe I’ll be sick of the sight of any sort of 9×9 grid. Anyhow, keep tabs on all things competitive puzzling via this link: http://forum.ukpuzzles.org/viewforum.php?f=5

All that remains to say is enjoy – and if you are feeling competitive, try for a sub 3 minute solve. If you are feeling really competitive, below 2 should also be doable.

#152 Sudoku – rated easy

[blockquote mark-up still apparently not working]

All puzzles © Tom Collyer 2009-11


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


February 04, 2011

Friday Puzzles #90

I’d definitely recommend the Guardian as the cream of the current UK newspaper sudoku offerings. There may be harder puzzles available elsewhere, but the Guardian puzzles always solve very cleanly, and often come with really striking designs. These are two aspects of a sudoku that most other newspaper providers manage to nail sporadically at best – and here I’m most disappointed to have to include The Times with its often clunky Puzzler Media supplied offerings.

Anyhow, this week’s puzzle is loosely based on a design that I saw the other day in the Guardian; I’ve added in the whole 1-9 theme, and removed a couple of clues to prevent total triviality. Scanraid is much better than me at grading sudoku, and it reckons it’s a 71 (gentle/easy grade). So there we are. Enjoy!

#116 Sudoku – rated easy

All puzzles © Tom Collyer 2009-11


December 24, 2010

Friday Puzzles #84

Happy Christmas, dearest reader!

I nearly forgot to put out a post – just like the good old days – but luckily enough there was something lurking at the bottom of the pile in my “unpublished” folder.

And with good reason too.

Christmas is an occasion the newspapers like to fill with bumper sized crosswords, and extra hard sudoku puzzles, and other puzzling novelties given that we have all this spare time on our hands. The thing with this puzzle is it’s much harder than that. Enjoy!

#110 Sudoku – rated hard

All puzzles © Tom Collyer 2009-10


December 10, 2010

Friday Puzzles #82

I’m afraid I’ve been in Galway all week, sans laptop, and so you’ll have to wait until at least Monday before I edit something in over this!

UPDATE:

So I have a little folder of odds and ends on my laptop entitled “unpublished”. In it, I found this rather pleasing looking sudoku puzzle. I haven’t had a look at it for a long while, so I can’t totally vouch for it being an easy, but it seems unlikely that I’ve stitched together a decently challenging sudoku that looks this good. Enjoy!

#108 Sudoku – rated easy

All puzzles © Tom Collyer 2009-10


September 02, 2010

Friday Puzzles #67

Again, apologies for the delay!


February 12, 2010

Friday Puzzles #31

So my pointed dig at the Puzzler media qualification scheme for the WSC continues with two sudoku puzzles I’ve written this week. One might be interpreted as a juvenile dig at the culture of following rules and regulations to the book, and the other is the finest sudoku puzzle I’ve ever written. Enjoy!

#036 Sudoku – rated hard

#037 Sudoku – rated medium
[censored due to provocative nature of the design of the puzzle]

All puzzles © Tom Collyer 2009-10


December 18, 2009

Friday Puzzles #28

Another sudoku puzzle this week – I’m not sure why I’ve done two in a row as sudoku tend to be harder work to write than other puzzles. Or at least that’s what I find anyway. This ought not to be as tricky as last week, but I think it’s a pleasant enough solve.

#033 Sudoku – rated medium

All puzzles © Tom Collyer 2009


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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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Latest comments

  • I like the appearance of the solution. :P Nice one. by Prasanna Seshadri on this entry
  • I think I've seen something vaguely similar in some of Palmer's puzzles as well. To be honest I've a… by on this entry
  • That's two puzzles in a row where I find something I had used before. I know, not plagiarism; just g… by Bram on this entry
  • Kota, that's not really true. I had made my puzzle before going to the WPC already. Also I don't hav… by Bram on this entry
  • About 20 minutes, after restarting from a mistaken conclusion. by Bryce Herdt on this entry

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