[damaniac]

Look at the hands. Think about them. Look at the game. Look at the player. Consider what hands he is likely to have.

I don't know that all those are right, but river raises and check-raises at 3/6 by TAGs generally are not stone-cold bluffs, nor are they often value-bets that can't beat a pair of aces with an 8 kicker, for example. In any event, think about the situation and analyze it, we are trying to apply thought to poker, not "Me have pair, pot big, me call."