One very risky cash game move that you’ll see experienced poker players make involves shoving on the flop with a flush draw. The obvious goal here is to force a fold because your flush is only going to connect 35% of the time (from the flop). This being said, it’s definitely worth further examining why somebody would shove in these situations.
The main reason for shoving with a flush draw is that you’re looking for fold equity – a.k.a. what percentage of the time you think an opponent will fold. For example, if you go all-in with Ks-Qs on a flop of Jh-8s-4s and think your opponent will fold 75% of the time, this is probably a +EV move (based on pot sizes). So the tighter your opponent is, the more likely you are to gain fold equity from shoving with flush draws.
Many people fail to account for all of their outs when deciding whether or not to shove. For example, let’s say that you hold Ad-Kd on a flop of Td-6d-2h; assuming your opponent calls and shows Q-Q, you actually have a 54.44% chance to win the hand. You’ve got 9 outs with the flush and another eight outs with your two overcards. Combine this with good fold equity and shoving on the flop is definitely a +EV move.
So far we’ve discussed how shoving with a flush draw on the flop can be a very good move in certain situations – against one player that is. However, if you have a feeling that two or more players could call you, it’s rarely ever a good decision to shove with flush draws. In most cases, you won’t run into this problem. However, if you’re on a table full of calling stations, you could very well be looking at a -EV situation.
One more point worth making in all of this is that you should usually be chasing a nut flush (or at least king-high) when shoving. After all, you’d hate to push your chips in with Qd-Jd, only to be called with Ad-Kd.