I spent ages typing in a post last night when, upon clicking submit, this cursed computer crashed. *gaaaargh*
Anyway, the gist of it was : Wayne spent 6 years developing his program and it was done - as previously mentioned - before the advanced solving techniques were developed. Michael Mepham spent a week developing his (
could this be 'good quality' sudoku?)
Farewell to Ariadne's thread? He now seems to have changed his mind about guessing. At least Wayne remains consistent about what he considers Invalid and Arguably Unfair - and is about to unleash the new version of the program on which, I believe he is working.
Having conducted a search using Google the only thing I can find on the rules is the "fill in each row.............." and Nikoli says. Wikidpedia
Soduku do a lengthy and informative piece on the subject, including guessing and all it's forms. So as to the rules of traditional sudoku (what it is, how it's created, what is regarded as 'good' etc), you have me at an advantage (Shogi, on the other hand, turns up quite a bit of information, including this:
Shogi which tells you about the aforementioned drops).
Wayne has already spoken on the subject of calling the puzzles sudoku, so there's no point - imho - in going over that again. And they weren't, as far as I can tell, 'invented' (if that's the correct word) in Japan. Nikoli developed them in Japan and gave them their name. It is from Nikoli that we get the 'they must be symmetrical and have only one solution' bit from - and who is to say that they are right? Well, Nikoli have been successful with their puzzles and have been creating them for a long time. However, solvers do have to rely on Nikoli to generate puzzles (no software to buy and use at home, then, to obtain advice - hints and tips? - from the 'masters' or practice your advanced techniques). There is an email address on their website that you can use for questions, beyond that its "fill in each........". And they are not overly impressed with the software approach to creating puzzles in general (if you want to take what
that implies into account).
As I understand it, Wayne's was the first sudoku software to become available and, as previously stated (curse compter crashes), will now be somewhat out of date, especially in the light of current techniques being developed at a frighteningly fast pace. He may, however, choose not to implement any of said techniques. There is the aformentioned software, freely available (as I understand it) to those that require it. More, I feel certain will be released as people decide to create their own for their own purposes based on what they consider the 'rules' to be.
So, in the end, what makes a good soduku? Who decides that? What are the rules of traditional sudoku?
The debate continues.
Luna