[runyan99]

I think your flop bet was too small. Betting only 20 encourages any decent draw to stay in the hand, which makes me nervous when holding AA. I'd bet around 40-50 on the flop.

I like your raise on the turn.

I'd bet more on the river. If your opponent is checking and calling a hand like A6o, you can charge him a little more. I'd either bet half the pot, or the whole pot, depending on my read. In any case, I think 50 into a 250 pot is too small. If your opponent comes over you now for 200 or 300, you have to consider folding to a possible set. If you bet more, it makes it harder for your opponent to make such a play on you (i.e. bluff the set).