Part: Part Six - Betting After the Flop

Raising a draw on the flop

Flop
Heads-upPot 1,500 (7.5 BB)Q♥8♥3♣BTNA♥K♥● 25,000 (125 BB)YOUnut flush draw + two oversMP● 25,000 (125 BB)Openerbets 900 (4.5 BB)D

You called a middle-position open on the button with A♥K♥. Flop Q♥ 8♥ 3♣ - the nut flush draw plus two overcards. He c-bets.

A monster draw (nut flush draw + overcards) in position, he c-bets. Best?

WhyRaise. With the nut flush draw and overcards you have a huge number of outs plus fold equity - raising can win it now and sets up to stack him when you hit. Calling is fine but under-uses the equity and initiative of such a strong draw in position.
What happensYou raise to 2,600; he calls. The flush completes on the turn and the money goes in.  You win.
With a nut-flush draw and overcards you raised the flop as a semi-bluff - fold equity plus a mountain of outs - instead of passively calling. Big draws play aggressively.

Raise big draws on the flop as semi-bluffs - with many outs and fold equity, you win now or have the equity to continue when called.