Part: Part Six - Betting After the Flop

Tighten up multiway

Flop
Heads-upPot 2,400 (12 BB)Q♠J♦9♥COA♠Q♦● 25,000 (125 BB)YOUtop pair in a 4-way potMP● 25,000 (125 BB)Bettorbets 1,800 (9 BB)D

Four players saw the flop. You have A♠Q♦ for top pair, but the board is Q♠ J♦ 9♥ - extremely coordinated - and an early player bets into the field.

Top pair, top kicker, but four-way on a wildly connected board, and someone bets into everyone. Best?

WhyFold. A bet into a four-way field on Q-J-9 represents a real hand - two pair, a set, or a made straight - far more often than heads-up, and players are still behind you. Top pair is in terrible shape here. Multiway pots demand much stronger hands to continue.
What happensYou fold; the bettor turns over J-T for the straight.  Discipline in a crowd.
A hand you'd happily stack off with heads-up became a fold multiway on a connected board with a bet into the field - the more players, the stronger you need to be.

Tighten up dramatically in multiway pots - bets into a field mean strength far more often, so top pair is frequently a fold on coordinated boards.