About This Site

I've never been interested in puzzles, so it's amazing that I wound up getting hooked on Sudokus. But if you contrast Sudokus with crossword puzzles or with games such as scrabble, you notice two big differences:

• there are a wide variety of very specific logical techniques for solving (even fairly difficult) Sudokus;

• there's an enthusiastic community of people who want to share their ideas on Sudoku-solving Tactics.

With the exception of athletic sports, only the games of chess and bridge have also given rise to a similar situation. It's the zeal of the people who have put up web sites on Sudoku solving that really piqued my interest in this phenomenon.

Given this active Sudoku community on the web, it is highly worthwhile to comb through the many sites that publish free material on Sudokus (see Links for some of these). Reading different people's ideas is the best way to try to put together one's own approach to Sudoku solving.

On this site I have attempted to provide a summary of Tactics that I have found useful for solving Sudokus. The focus is on Tactics which have easy-to-recognize, frequently occurring patterns and which often yield a significant number of Kills (or Crownings).

As for the future, I don't expect to make any major changes to this site (barring the possibility of a breakthrough, somewhere in the world, leading to a sufficiently uncomplicated technique for the solution of Diabolical Sudokus by human solvers — that would get my attention).

Like most people I have a lot of things going on in my life, and beyond that I am a notoriously unreliable e-mail correspondent (just ask my relatives).  Nevertheless, if you have any corrections or advice, you can e-mail me at

(This address is shown as an image in order to foil the robots that crawl the web looking for volunteers who would enjoy receiving yet more spam.)