I will only make smaller bets on the river as a blocking bet or as a value bet.

The blocking bet is difficult to do well but when I think I may have the best hand but he has been the aggressor so far, I'll lead out on the river for a decent ammount but nothing that will commit me. If he raises, I'm done. If he just calls, I get a cheaper showdown without a decision.

If someone else is being the aggressor, I will raise any bet that I precieve as weak. Usually on the turn (if the flop bet was weak) where it's more convincing that I have them beat.

-'rilla