Alex Little

Yesterday I found a sudoku that my sudoku solver program couldn’t solve, so might try and find some time to update the algorithm (at some point). The reason my algorithm didn’t work was because there were (at least) 2 solutions to it, my algorithm looks for squares where only one number can fit (within either a single square, box, row or column), but with this sudoku you would get to a point where you had to decide which of two numbers to enter into a square – which one you entered didn’t matter because either would result in a valid solution. So looks like I need to make my algorithm cope with this somehow – haven’t thought yet exactly how I’ll do it though!