Top Definition
A rule that Texas Hold'em players use stating that on the flop, a player's chances of making a hand are approximately 4% times the number of cards in the deck (outs) that would make the hand.
I have J-10 and the flop is Q-9-5, giving me an open-ended straight draw. With four eights and four kings in the deck that can make my hand, the Rule of Four states that my chances of getting the straight are 32%.
by HeavyD2 October 25, 2008

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