Check back weak pairs on Ace-high boards to realize equity, then fold when the aggressor continues on blank turns.
Flop Analysis
Checking back is the most robust play here. While we have a pair, it is extremely vulnerable on an Ace-high texture, and checking allows us to realize equity without bloating the pot against a range that contains many Ax and JJ+ combos.
**Ranges:** BB's check is common even with strong hands like AQ or AJ to protect their checking range. Our range is condensed toward mid-pairs and suited connectors, making this a neutral equity spot.
**Board:** The presence of two broadway cards (A, J) heavily favors the 3-bettor's range. Checking back prevents us from being check-raised off our 35% equity.
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> **Takeaway:** On Ace-high boards in 3-bet pots, check back your marginal pairs to control the pot and realize equity IP.
Turn Analysis
Folding is the correct pure strategy here. Once BB follows up their flop check with a 70% pot bet on a blank turn, our 99 is reduced to a pure bluff-catcher that blocks very few of their semi-bluffs.
**Math:** We need ~29% equity to call, but against a range that has now improved with sets (JJ, 77) and two pairs (A7s, J7s), our pair of nines is at the bottom of our continuing range.
**Blockers:** Holding the 9d and 9s is actually detrimental; we block some of the natural bluffs BB might have, such as T9s or 98s, making it more likely they are betting for value.
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> **Takeaway:** Don't feel obligated to defend the bottom of your range just because you have a pair; fold when your hand unblocks the opponent's value and blocks their bluffs.