[UATrewqaz]

Quite often there is a 100% best decision and other times it depends on your read.

For example:

Say there are 4 people in the pot at the river and you have the stone cold nuts, the first guy bets out (a known bluffer).

You are 2nd to act.

Do you raise or call?

The answer: It depends.

If you know the opponents behind you are pretty loose and will call a bet then by calling you gain +2BB (both their calls).

If you raise you are pretty sure they'll fold and the original bettor will probably call (thus you gain +1BB).

However if the original bettor folds (say it was a pure bluff) then you gain 0 BB.

However if you just call and hte players behind you both fold anywah you get 0 BB more.

So you can see how your ability to read your opponents hands/personalities/actions factor into what makes a decision good.