Whenever I fly I have a go at these damned Sudoku things - must be hundreds of "Qantas magazines" flying around up there with half completed Sudoku puzzles I started.
I figure we could give each other some lessons. I'll start with an example I posted on the "Games" thread.
Proposal is to have a go at a medium hard sudoku..
http://www.websudoku.com/THere's an easy one posted a couple of months ago - already posted on games thread). .... here :-
you can repeat any puzzle you wish ( they all have numbers),
so here's "Medium" difficulty Puzzle 2,557,675,180 (or level 2) - proposal is to publish the answer. - including explanation of the steps.
I believe I've filled in all the obvious squares. (eg added a 9 , then a 6 , then a 6 , then a 1, then a 2) etc
How do you experts out there proceed from here?
ok - I have now set the options to permit two options and/or text to be written in a square - (I'm fairly sure it will be necessary)
One way I have (very occasionally) found helpful is to write down two optional places for the 1 for instance - eg in the second row I have written 1a and 1b - i.e. it must be in one of these positions.
Incidentally I've also written 6a and 6b (one or other of these is a 6)-
also 6c and 6d ( ditto) etc etc
to be honest I tend to get stuck on these harder ones - so if anyone's an expert out there , I''d appreciate your advice
Ahhh I see a light ...
... 4b is a 4 for a start - (from looking at the 5th row) - to be continued