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Backdoor draws: the hidden equity in your hand

A backdoor draw needs both the turn and the river to complete. For example, you hold A♥ K♥ and the flop has one heart: you need two more hearts for a flush. On their own backdoor draws are weak, but they add extra equity that can turn a fold into a profitable continue.

Backdoor draw Chance to complete by the river
Backdoor flush (need two more of your suit) About 4%
Backdoor straight (e.g. three connected cards needing two more) About 1–4%, depending on how many ways it can complete

Small numbers — but they add up, and a backdoor draw often turns into a real draw on the turn (for example, a flush draw after one more heart).

  1. C-betting: a missed hand with a backdoor flush draw is a better bluff than one with nothing. See continuation bet.
  2. Floating and calling: backdoors help you continue with overcards. See float.
  3. Barrelling: if the turn gives you a real draw, you have a good reason to keep betting. See double barrel.
  4. Choosing bluffs: when you must pick which missed hands to bet, prefer ones with backdoors.

You raised with K♠ Q♠, flop J♦ 7♠ 3♣. You have two overcards, a backdoor flush draw and a backdoor straight draw (a 10 and 9, or A and 10). That’s a decent hand to c-bet small: you can win now, and many turns give you a real draw.

Backdoors are a tie-breaker, not a reason to call big bets. Without other equity, they don’t give the odds for large calls. See pot odds and playing draws.

A draw that needs both the turn and the river to complete, like a backdoor flush draw.

About 4% of the time from flop to river.

They add equity for c-bets, floats and barrels and can turn into real draws on the turn.

Should I call big bets with only a backdoor draw?

Section titled “Should I call big bets with only a backdoor draw?”

No. Backdoors alone don’t give the odds for large calls.