The "no losing chances" version of the USCF rules for draws apparently "requires" a C-Class player to hold the drawn against a much stronger player, (perhaps even) a GM. Not sure exactly.
But I have heard it debated at tournaments, ad nauseum. Yawn.
His point was that Arbiters nomally use the litmus, "A C-class player could draw a GM in the given position". Therfore, he wanted the Arbiter to prove his decision was correct by finding a C-class player that could draw him in the given position. I don't know the position, but a friend of mine who was rated around 2000 USCF, he would not bet on a C-class player drawing the position againgst Larry.