The preflop/turn lines are solid, but versus a balanced range we give up too much EV by folding second pair to the river jam with these pot odds.
Calling the small lead with an overpair is exactly what we want: we’re well ahead of a wide c‑betting range and the price is excellent, while raising mostly isolates us against stronger made hands and strong draws on this connected texture.
Continuing vs the small second barrel with overpair + gutshot is mandatory: our hand retains strong equity even though the turn is better for CO’s range, and the sizing plus position make calling clearly superior to raising or folding.
From a GTO perspective we’re supposed to bluff‑catch here: second pair with a gutshot and this price sits well above the folding threshold, even on a board where villain’s range is stronger overall. **Ranges:** CO arrives at river with many strong hands (straights like 6x and 9T, sets, overpairs, Jx), but also a non‑trivial number of missed or thin value hands that bet small earlier (A-high floats, underpairs, weaker 7x/8x) which now either bluff or overplay. Our 99 beats all those weaker pairs and bluffs while only losing to Jx and better. **Board:** The runout stays straight‑heavy but never pairs or completes a flush, so our relative hand strength downgrades from overpair to second pair, yet the texture is still such that villain’s value range is polar (mainly Jx+/straights) rather than “every pair bets big”. **Math:** We’re getting about 1.6:1, needing ~39% equity; second pair with our specific blockers and position meets that requirement well enough that folding here over‑folds our range versus a balanced strategy. **Exploits:** At NL200, many players under‑bluff big rivers in 3‑bet pots on scary textures, especially after betting small flop/turn then sizing up; if we have no evidence that CO bluffs these spots, over‑folding second pair like this can be reasonable exploitatively. --- > **Takeaway:** Versus a balanced opponent we should call this river with second pair getting good odds, but at NL200 we can deviate and fold only if we’re confident population isn’t bluffing enough.
Note: Solver wants us to bluff‑catch this river with 99 most of the time; folding second pair at this price is an over‑fold versus a balanced range.