K♣5♣ BTN vs BB, river on Q♣ 9♦ 6♣ 2♠ A♦, 55 bb

Best play: Overbet 120% pot

Why

River (Q‑9‑6‑2‑A). With two clubs on board (Q♣6♣) plus K♣5♣, hero holds four clubs — one short of a flush — and the unpaired board leaves him with K-high air, no pair, no draws (hand is final). The K♣ is a useful blocker: it removes the King-high club flush and reduces the BB's strong club holdings. Against a range capped by the river check, the overbet is a clean polarized bluff — zero showdown value to give up, good blockers to the hands that would call, so 120 percent maximizes fold equity.

Key idea

Busted high-card air with a flush blocker is an ideal river overbet bluff against a capped range — no showdown value lost, blockers cut their calls.

Common mistake

Giving up and checking the busted K-high — it can never win at showdown, so checking forfeits the EV the overbet's fold equity captures.