Backdoor

Definition of backdoor

The expression "backdoor" in poker means that a player's hand has improved with the help of two cards, the turn and the river. If we have in our hand, for example, two cards in spades on a flop that contains two spades, we would say that we have a draw. But if the flop has only one spade, we will have a draw of "backdoor" since we need two cards (in this case a spade on the turn and the river).

Examples of a backdoor draw

Player A receives his preflop cards and finds AA. Player B receives KK. The flop falls A-2-8 rainbow. In this situation Player B will need two cards to help him. If the turn is a king and the river is also a king, the player is said to have made a square "backdoor". Another less extreme example would be this one. Player A and B are playing against each other on a flop A-T-2. Player A has AK while player B has a three of king of 10 (pair of 10's in hands). Here Player A will need two cards to improve his hand. His equity will generally be low in this type of situation, about 5%. If the turn gives an A and the river gives a K, it will be said that Player A has won the hand on a draw of backdoor (also called "runner").

Backdoor

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