Turn

You're on the button with Kd Jd. UTG opens, you call, the blinds fold. Flop comes Qd 8d 3c, giving you a flush draw with two diamonds still to come. UTG bets 20 into a 30 pot and you call, priced in fine with two cards left. The turn is the 2s, a blank. UTG fires again, but now it's 40 instead of 20. The pot grew, so the bet grew with it, and you have one card left to hit your flush instead of two.

That's the turn's trap: your draw got worse and the price to chase it got higher. Nine outs with two cards to come is about 35 percent to fill the flush. With only the river left, that drops to roughly 19 percent, call it 4-to-1 against. A call that was easy on the flop can be a clean fold facing a similar bet on the turn, because you're paying more to see fewer chances.

Beginners treat the turn like an extension of the flop and call out of habit, never recounting outs or odds. Half their equity just vanished and the bets scaled up with the pot. Good players re-check on every street: new pot odds, implied odds if the draw hits, and the discipline to fold a draw the turn made too expensive to keep chasing.