Turn 5♠, Hero BB with 9♠9♦

The math

GTO answer: Bet 24bb

UTG cold 3-bet but checked the flop, capping his range to AK that gave up, JJ-QQ pot-controlling. BTN's flop check is also weak. 99 has reasonable showdown value plus an OESD with a 6 or J coming. Donk-bet around 24bb (40% pot). You take the lead from two capped ranges, build a pot when you improve, fold out AK and weak overpairs, and you have a backup plan when called. Checking gives villains a free card to a hand that could outdraw you. Multi-way 3-bet pots reward initiative when the field signals weakness.

Tags: turn 3-bet pot multi-way 99 probe