Joined: 23 Apr 2007
|Posted: Wed May 09, 2007 7:37 pm Post subject:
|The generator is unrelated to the logicals solvers / techniques.
In brief it works as follow:
1. It fills in a valid grid at random
2. It chooses givens and checks for unique solution, adding more givens until it gives a unique solution
3. It minimize the givens by removing each given which is not required to get a unique solution
The generator uses the recursive solver to check for unique solution. It does not use any logicals solvers / techniques.
The number of guesses displayed may give an idea of the difficulty. If it reports 0 guess then, for sure, the grid can be solved using only naked & hidden singles. If it reports several guesses, it will require some other technique. But the number of guesses do not necessarilly relate to the difficulty. A grid with one guess could be a real though one, whereas one with 10 guesses could well be solved using only "simple" techniques like locked candidates, naked & hidden subsets...
So if you want to check how hard it is to solve for a human beeing, you should try to solve it with the logicals solvers / techniques and look at the stats.