The word pwn originally comes from the infamous Alexander Alekhine (http://tinyurl.com/9byqo) who was one of the great Grandmasters of Chess. His dominating openings of using his pawns was to control the crucial center spaces of the board. During his matches, Alekhine was known to drink heavily and spout anti-semetic remarks. In a match in 1935 against a Dutch master named Euwe his drinking had gotten the better of him. Before starting the match he said to Euwe in a very broken heavily accented russian voice "I will pawn to your knight" (a common variation of his defense was to box his opponents knights using 2 pawns and his white bishop) which ended up sounding like "Evil pwn you tonight". Unfortunatly for Alehkine he gave away his gameplan which Euwe was able to take advantage of. Alehkine lost the match.
The word pwn has resurfaced from time to time in the chess community. It looks like it has finally found it's place in history along with it's founder Alehkine.