Philsfolly

Philsfolly is a sudoku solver and tutor written in Javascript. It attempts to be a truly interactive program that allows one to choose which technique to try at each stage of a solution. Each of the many techniques available has its own help page. Being a web based program, it involves no downloads or installations, and can be accessed anywhere.

It provides standard techniques such as naked singles, hidden singles, line/box interactions, naked subsets, hidden subsets, fish, POM, ALSs, unique rectangles, and chains. Then for the very hard puzzles it provides, in addition to SK loops and Exocet, a new solving technique utilizing units and patterns, which allow one to solve logically even the very hardest puzzles.

As a web-based program, it performs differently in different browsers. Chrome works by far the best for this program. Firefox is OK but has the problem that the alert boxes can't be moved. The program runs painfully slowly in IE.

Author

Philip Beeby

Web address

Philsfolly