T♠9♠ SB vs BTN, turn on Q♠ 9♦ 4♣ 2♠, 70 bb

Best play: Raise

Why

Turn Q9 4‑2 with two spades on board (2-spade), hero is out of position in the SB versus the BTN. Hero holds T‑9 of spades for middle pair (nines) plus a flush draw (Q-spade and 2-spade with hero's two spades = four spades, one card to a flush). That pair-plus-flush-draw is a high-equity semi-bluff, so raising builds the pot, gains fold equity now, and can stack off when the flush hits out of position.

Key idea

A pair plus a flush draw is a strong semi-bluff that prefers raising to combine fold equity with strong made-hand equity.

Common mistake

Flatting a pair-plus-flush-draw and forfeiting the fold equity and protection that raising captures.