ConceptsBetting
Check-raising
Check, let them bet, then raise: the out-of-position player's strongest weapon.
What it is
A check-raise is checking with the intention of raising after the opponent bets. It is mostly an out-of-position play — usually the big blind against a c-bet.
A good check-raising range has strong made hands (sets, two pair), strong draws that are happy to get more money in (semi-bluffs), and a few bluffs with some equity. Medium hands that want to reach showdown mostly call instead.
Why it matters
It punishes frequent small c-bets: a raise forces the bettor to fold the bottom of a wide range or put in much more money.
It builds the pot out of position with strong hands, and charges draws more than a call would.
It works best where the defender has a nut advantage — more of the very strong hands than the bettor.
The maths
The fold rate a check-raise bluff needs equals the chips the raise adds divided by the pot before the raise plus those chips.
- pot
- the pot before your raise, including their bet
- raise
- the chips your raise puts in
Worked example
Raising a small c-bet
The pot is 6 bb, your opponent bets 2 bb (the pot is now 8 bb) and you raise to 7 bb.
- Your raise adds 7 bb to win the 8 bb in the middle.
- As a pure bluff it must work 7 / (8 + 7) ≈ 46.7% of the time.
- A flush draw needs less than that, because it can still win when called; a hand with no outs needs all of it.
Check-raise bluffs should have equity. Without it, the raise needs folds nearly half the time against a range that was willing to bet.
Try it
Change the pot and the raise to see how often a check-raise bluff has to work.
Common mistakes
- Check-raising only the nuts, so every raise is face up.
- Check-raising medium hands that would rather call: the raise folds out worse and gets called by better.
- Raising too small, giving the bettor a great price to continue.
- Forgetting what the raise is for: value, protection, or fold equity — and which hands call it.