AJs SB on TT9r: Never Fold Nut Flush

Hero: A♠J♠
Position: SB vs MP
Pot: 3-Bet Pot
Flop: T♠ T♥ 9♣

With the nut flush on a paired board after betting river, we are priced in to call the shove; earlier streets are mostly fine aside from a too-small flop c-bet.

Flop Analysis

Flop Ts Th 9c in a 3-bet pot at ~6 SPR is a very range-favored board for MP; they have more Tx, 99, and TT in range. AsJs is just A-high with a backdoor nut flush draw and some backdoor straight potential, so it’s a clear mixed candidate. Solvers typically check the majority of range here OOP and when they bet, they favor a larger sizing (around 75% pot) to put pressure on underpairs and 9x. Our tiny 3.5BB stab into 15BB doesn’t really accomplish much—worse hands fold too easily, Tx/9x never fold, and we don’t deny much equity from overcards.

Turn Analysis

Turn Qs is a dream card: we now have the nut flush draw plus an open-ended straight draw to K (AKQJT), while MP’s range picks up lots of medium-strength hands (Qx, 9x, underpairs, some Tx boats). Range-wise, our 3-bet range now has a slight value advantage thanks to all the overpairs and strong Tx/QQ/QQ+ type combos. This is a good spot to lean into aggression. A 1/3-pot bet with AsJs fits well: we leverage fold equity against hands like JJ–88 and non Tx/Qx 9x, while building a pot when we hit our many nut outs. Checking is still reasonable at some frequency, but betting small is very much in line with optimal play on this card.

River Analysis

River 3s completes our nut flush on Ts Th 9c Qs 3s. Board is paired and flush-completing: value hierarchy is boats/quads > nut flush > other flushes/straights. From a range point of view, we have plenty of full houses (TT, QQ, 99, some TxQx/T9s) but also several strong flushes, while MP’s range has more Tx and 9x that got sticky plus occasional boats and worse flushes. Solver range strategy likes a lot of checking here OOP to allow villain to value-bet/thin-bluff and to protect our checking range with some nutted hands. Our 16.5BB bet into 36.5BB is a middling size that still gets called by worse flushes and some stubborn full-house candidates, but it also opens the door to getting jammed on. Jamming ourselves or checking are both higher-clarity lines: jam polarizes and denies MP the chance to raise us off equity; check induces bluffs and keeps our range protected.

River Analysis

After we bet river and MP shoves over the top, we’re looking at a call of ~66BB to win ~201.6BB (pot 135.3BB + our call), needing only about 25% equity. On Ts Th 9c Qs 3s holding AsJs, we cannot be overflushed—only full houses and quads beat us. MP has some full-house combos (TT, 99, QQ, occasional Tx9x/QT/T3s) but also a lot of worse flushes and possibly straights/trips that decide to overplay or bluff. Given we block the nut flush and don’t block boats like TT/99/QQ, the bluff/value ratio is still easily wide enough that the nut flush is a pure, mandatory call at this price. Folding here would be passing on massive equity and is a large error in a single-raised 3-bet pot configuration.

Key Concepts

6.2
Villain Slight Advantage
OOP
Wet Board
LEAN TOWARD CHECK