Chess
In my engineering studies I found that the best way to master a subject was to teach it. If not teach it, to write a text book on the subject.
On this website, I am presenting two of my efforts. One deals with mastering the endgame of rook vs. rook and bish op's pawn and rook's pawn. I have spent six months studying this fascinating endgame and have found that the standard texts are incorrect. I thinkyou will enjoy reading this.
Since my biggest chess weakness is tactics, I decided to write a text on that subject.