"The majority of players are looking for reasons to fold. I am looking for reasons to play." ~ Daniel Negreanu The Rule of 2 and 4 are quick shortcuts to help us work out the percentage needed to get a draw in Texas NoLimit Hold'em. These shortcuts aren’t exact. However, they are good enough for doing quick probabilities in our head at the tables.
The Rule of 2 The Rule of 2 states: Multiply your number of outs by 2 to get the approximate percentage of a draw you have on the turn or the river. For example, let's say you have a flush draw after the flop.
The Rule of 2 works because there are 52 cards in the deck and 52 goes into one hundred approximately twice. The Rule of 4 The Rule of 4 is used when you are considering an allin move after the flop and will see both the turn and river cards. Multiply your number of outs by 4 to get the approximate percentage of a draw. Like the Rule of 2 example, you have a flush draw after the flop.
Once again, that’s close and useful for quick estimate at the tables. Note: The Core Math Chapter of Mastering Poker Math provides more detail on how this equation is derived.
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