you really have to be quite bad at chess to ever lose with a rook advantage against anyone. just play defensively and force a bunch of trades -- they don't all even have to be even -- and you'll be unstoppable in the endgame. this is why chess is a terrible game to handicap -- a single pawn advantage would be enough to make any competitive player a favorite against the top gm's in the world.
A single pawn advantage would make a "competitive" player a fav over top gm's? LOL, that's the most ridiculus statement in this thread, first of all what do you call competitive player? 2000 ICC?