Part: Part Eight - Making Moves

The re-steal

Pre-flop
Blinds 200 / 400Pot 1,500 (3.8 BB)BBA♦9♦● 18,000 (45 BB)YOUto actBTN● 18,000 (45 BB)Wide buttonraises 900 (2.2 BB)SBfoldsD

As the blinds climb, a button that's been stealing relentlessly opens again. You're in the big blind with A♦9♦.

A habitual button stealer opens; you hold A♦9♦ in the BB. Best?

WhyHe's been opening the button every orbit, so most of that range is junk that can't stand a raise. Three-betting reclaims the pot now, and A-9 suited isn't dead weight when called - blockers to his aces, a suit to fall back on. Flatting out of position just invites him to keep jabbing.
What happensYou make it 2,700 - and this time he wakes up with a real hand, calls, and drags it. It stings, but don't flinch: against a button opening that wide, this three-bet is a long-term winner. You'll get looked up now and again and still profit from the play.
You can't fold every time a maniac opens - that just hands him your blinds. The re-steal punishes wide openers over a thousand hands, including the ones where you get called and lose one like this.

When someone opens far too often, most of that range is hands that can't take heat. A three-bet from the blinds turns their own aggression into your profit.