Definition of push or fold
"Push or fold" literally means "push or fold yourself". Fold means to fold. Push" is when a player takes his entire stack of chips and pushes them into the middle of the table. As a result, he's all in. Push or fold" is generally associated with tournament poker. In tournament play, when a player is low on chips, he's in a "push or fold" position, meaning that the only viable options for him are to push his entire stack or fold. In other words, there's no room for maneuver as there was when he had a good stack. Normally, we can raise 3BB, bet on the flop and fold if our hand is too weak and we have resistance, but when we have 6 big blinds, for example, our options are limited.
Push or fold according to the Nash chart
In tournament play, when we have 15 big blinds or less, it's time to eliminate certain options. Normally, you can fold, raise or 3bet or 4bet, etc., but with so few big blinds, there are only two options to consider: push or fold. To do this, you can use a chart based on the great mathematician Nash's equilibrium. This chart will give you the range of mathematically profitable hands to push, depending on your position, your hand and your number of chips.