Sudoku Source Code

This implements the 5 phases described on the solver page (except the first part of phase 3, looking for numbers that only appear twice and in pairs). This solves all the examples I have tried.

When it can't solve a puzzle using the first 4 phases it enters phase 5 which is intended to enumerate the possible solutions (on the assumption that there are more than one). If there is only 1 solution which isn't found after the first 4 phases then phase 5 will find it. I currently don't have any examples where there is a single unique solution that can't be found using the first 4 phases.

This implements the Sudoku creating algorithms described on the "Make your own" page.