Big draw/wierd turn spot

[Raist0000]

I checkcall for sure, I think a bad player who checks behind in that flop have a-high a high percentage of the time.

[vmacosta]

rzk,
"we need him to fold to a bet roughly 20% of the time to make a turn donk better than c/c."

if this were true I'd be donking every draw I ever had. The worry here is that after the flop chk-behind, people typically have weak SD hands like Ax and Kx. The ace is the consummate card for a pfr to both have and/or represent so when it comes he will raise our bet a lot and his k-hi or whatever will win if we don't improve.