J♠T♠ BB vs BTN, turn on A♣ 7♦ 3♥ 9♠, 75 bb

Best play: Call

Why

The 9 turn on A‑7‑3 connects with hero's J‑T to make an open-ended straight draw (a Q or an 8 completes the straight) plus a backdoor spade, though hero still has only Jack-high for showdown. On an ace-high board the BTN bets a wide turn range heads-up, but it is heavily weighted to Ax and air; hero's eight straight outs make calling profitable to continue and hit the nuts on a Q or 8. From the BB out of position, calling is correct: hero has too little showdown value and too few blockers to raise as a bluff here, but enough equity from the open-ender to peel one off rather than fold against the BTN's wide betting.

Key idea

An eight-out straight draw out of position with little showdown value calls to continue — not enough to raise, too much equity to fold.

Common mistake

Folding the open-ended draw to the ace-high turn bet, surrendering eight clean outs to the nut straight against a wide range.