Sudoku

[DrSpike]

Indeed, guess and verify *is* a logical method of proving a possibility exists.

[Adagio]

Could someone post a situation where you had to use the "first guess, the verify" to continiue the game?

[DrSpike]

Well unless someone has a half finished sudoku they are willing to post I'd say no.

[Adagio]

But maybe someone remembers my request when they're playing a new sudoku game and gets to that point

[duke o' york]

Not using guesses, then I doubt I'd ever have a situation like that. Plus, I'm too lazy to do the basic coding required to get the stupid boxes to line up.

[snoopy369]

Just copy mine

[duke o' york]

I went crazy yesterday, and bought the Independent's first book of Super Sodoku. It's a 16x16 grid, with 0-9 and A-F to put into the squares. And I haven't even finished the first one yet.
Mainly because I've been here, or playing games.

[Skanky Burns]

Priorities.

[Lul Thyme]

Originally posted by Adagio
Could someone post a situation where you had to use the "first guess, the verify" to continiue the game?

Strictly speaking, you never have to guess unless the final solution is not unique.

[DrSpike]

Originally posted by DrSpike
Well I'm not sure what the distinction between the guess and working it out is. Say there are a few possibilities left, and you put in a 'guess' and follow that 'guess' to it's logical conclusion, to find that there is no solution with your initial choice. That's one quite reasonable way of proceeding and eliminating possibilities.

[duke o' york]

Yes, but you have to spend ages removing all the wrong answers that you've written in.

[Urban Ranger]

I am still interested in developing an algorithm that solves Sudoku. Maybe some time Real Soon.

[Dry]

Originally posted by Dauphin
Not sure why it became such a massive phenomemon just now, I've been doing them for quite a while (8-9 months or whenever it was The Times started doing them) and its only in the last couple that its become the jeux du jour.

It's since a guy called Wayne Gould developed a program to generate them ad libitum.
He sold it to different papers.
Easier and cheaper to generate than classical crosswords.

[lord of the mark]

the Wapo now carries this Sudoko thing, so i sometimes do it on the metro after ive finished the crossword. I can do the easy ones, and almost all of the medium, but have difficulty with the hard. I prefer to do it pretty "ad hoc" POTM was doing one, and I saw here writing out some huge chart of possibilities.

[Adagio]

I haven't done any real hard ones yet, I've only tried those from timesonline (the diffecult ones from the site)

Does anyone know where to find some hard puzzles?