It's easy for a big stack to knock you around 1 on 1. It's kind of hit or miss. You need to come out swinging for the first couple hands, and if you win them (or one big one), your opponent will be put on the defensive slightly, even if you are still well below him chip-wise. If you play like I've seen so many small stacks - waiting for a great hand to go all-in on - you'll have no hope. Strike hard and early, and you have a shot.