[bluefeet]

"im the BB. blinds are something like 200/400 i think. anyways. we are both in"

-- he limped, you checked? if so, raise it 3x next time (or push)

"ace 2, 6 all spades. so i flopped the nut flush. so anyways, i obviously check. "

-- had you raised 3x PF, push this flop - seeing that you didn't, bet 1/2-3/4 pot.

"he checks. turn comes ace. i check"

-- had you raised the flop and had he called, check/fold the turn (let's not forget though, that we raised PF and pushed the flop). since you didn't raise PF, or bet the flop, we need to bet this card....1/2-3/4 pot, folding to an all-in push.

"he checks. (im hoping he has an ace) river comes 4. I go all in, he calls"

-- had you bet the turn and he called, we check/fold the river. since you didn't raise PF, bet the flop, bet the turn, we check/fold as well (let's not forget though, that we raised PF and pushed the flop).

hope this helps.