The key to very short handed play (3 players or less) is hyper agression. Steal everyones blinds alot. Force them to fold the flop when they miss. You will slowly chop away at the other player's stacks this way. Make them fear getting into any hand with you. The real secret though, is with your reads. You have to know when to fold and let a hand go. Against weak players, this strategy will ruin their stack very quickly. And then at some point, most weak players get fed up of being pushed around and start pushing back with reraises and random all ins. This is when you know you have them. Just wait till they decide to push at the wrong time and their chips are yours.