Backdoor

Definition

This is a situation where you are missing 1 or 2 cards to form a combination of strong cards. Often we limit backdoors to the straight or the flush. In these cases, it is called backdoor straight or backdoor flush.
However, the chances of completing one of them are low.

Example

The flop is
6
diamondsdiamondsdiamondsdiamonds
2
heartheartheartheart
A
spadesspadesspadesspades
you have
9
heartheartheartheart
10
heartheartheartheart
. Here you have 2 possible backdoors:
  • Backdoor flush, if 2 heart cards come on turn and river you will get a flush.
  • Backdoor straight, if a 7 and an 8 comes on turn and river, you will form a straight.