Object: Checkmate the opponent's King.
 
Passive Aggressive Chess is a variant on Chess I conjured up one february morning, that is fairly unique to most variants of chess.
 
In this version of Chess, All original rules apply excluding En Passant, except for one crucial difference. No piece may ever capture another piece.
 
Playing chess with out captures creates an entirely different element of Strategy, based more on how you develope your pieces than in normal chess, since essentially, who ever has more room, has the upper hand.
 
Zillions has slight trouble playing this game well, I think mainly due to the fact that ZoG is based mostly on Aggression tactics, and thats hard to pull off when you can't capture anything. For the most part though, I am still surprised how well it did play this variant.