Part: Part Six - Betting After the Flop

The check-raise semi-bluff

Pre-flop
Blinds 100 / 200Pot 1,300 (6.5 BB)BB10♠9♠● 25,000 (125 BB)YOUto actBTN● 25,000 (125 BB)Buttonraises 600 (3 BB)SBfoldsD

A button opens and you defend the big blind with T♠9♠.

Button opens; you hold T♠9♠ in the BB. Best?

WhyCall. A suited connector that flops big draws.
What happensYou call.  Pot: 1,300 (6.5 BB).
Flop
Heads-upPot 1,300 (6.5 BB)J♠6♠2♦BB10♠9♠● 25,000 (125 BB)YOUflush draw + overcardsBTN● 25,000 (125 BB)Buttonbets 800 (4 BB)D

Flop J♠ 6♠ 2♦ - you flop a flush draw with two overcards. You check, the button c-bets.

You flop a big draw out of position and he c-bets. Best?

WhyCheck-raise semi-bluff. You can win two ways: he folds now, or you complete one of your many outs (flush, plus straight/pair outs). Combining fold equity with strong draw equity makes the raise far better than a passive call.
What happensYou check-raise to 2,400; he folds his unpaired hand.  You take it without a showdown.
With a big draw you check-raised as a semi-bluff - fold equity now plus a heap of outs when called. Aggression with draws beats passively calling and hoping.

Check-raise your big draws as semi-bluffs - you win when they fold and you still have heavy equity when they don't.