[waffle]

this is highly dependant upon your opponent and the board. each situation is different.

usually betting the flop is OK.

the turn is tricky. what is your opponent's hand range after calling the flop given the preflop action? what does your opponent put you on and how will he respond to a turn bet with different hands in his range? a check? this is a tough poker decision and it requires thinking [img]/images/graemlins/grin.gif[/img]

and usually checking the river is OK. if you are betting the river with ace high, what is the purpose of your bet? value? bluff?

edit: i wrote this post assuming HU in position.