A float play can be considered an advanced technique when bluffing in Texas Hold em that is extended to two betting round.
The logic is that you want to make your opponent think that you have a stronger hand when the flop is revealed and when you get to the turn betting. End goal is to win the pot, of course.
What you do on a float play is call the bet of your opponent during the flop. When he checks you bet on the turn so you will have the advantage before the river. It is really a good bluffing maneuver and you can practically make use of any two cards you get.
You can only make a good float play if you are acting after another player and if you are only on a heads up situation.
It is never an ideal situation if you have another player who wants a chunk of the pot. Another player makes the situation pretty complicated to execute a float play. Your display of strength might be ignored when you have another player who’s aggressive on betting. Keep things simple and just use it with an opponent.

