9♠9♦ BB vs BTN, river on A♣ 8♦ 5♣ 5♥ 2♠, 95 bb

Best play: Check

Why

Final board A♣ 8♦ 5♣ 5♥ 2♠: the ace and the paired fives mean BTN's value is Ax, trip fives, 8x and better two pairs, while busted clubs are the bluffs. Your 9♠ 9♦ plays as nines-and-fives — a weak two pair that is really just an underpair to the ace; it beats only the BTN's pure bluffs and loses to every Ax, every 5 and 8x. That makes it a bluff‑catcher, not a value hand, so overbetting 120% is a serious error: a polar overbet should never be a medium hand that folds out worse and is only called by better. From the BB this should check to bluff‑catch or take showdown.

Key idea

A medium bluff‑catcher belongs in your checking range OOP, never in a polar overbet that only worse hands fold to and only better hands call.

Common mistake

Overbetting a weak two pair / underpair-to-the-ace as if it were the nuts, getting called only by better and folding out the bluffs it beats.