ConceptsBetting
Thin value betting
Betting a hand that is only a little ahead of what calls it — profitable more often than it feels.
What it is
A thin value bet is a bet with a hand that is ahead of the calling range, but not by much: second pair on a quiet river, top pair with a weak kicker against a player who calls light.
On the river, with no raise to fear, the rule is simple: a bet gains when more than half of the hands that call it are worse than yours.
Why it matters
Checking back a hand that would be called by worse leaves money on the table every time. Over many hands, thin value is a big part of a winning player's edge.
It works best in position, on static boards, with a size that worse hands can still call.
Its opposite shows up in the analysis as a flag: checking back the nuts on the river, where any bet would have been called by worse.
The maths
What a river bet gains over checking equals the call rate times the bet, times two times the share of calls you beat, minus one.
Worked example
A small river bet with top pair, weak kicker
The pot is 20 bb on the river. You bet 7 bb. Your opponent calls 40% of the time.
- If you beat 60% of the hands that call: 0.4 × 7 × (1.2 − 1) = +0.56 bb per bet, compared with checking.
- If you beat only 45% of them: 0.4 × 7 × (0.9 − 1) = −0.28 bb. Check.
- A bigger bet usually changes both numbers: fewer calls, and the calls that come are stronger.
The question is not "am I ahead of their range?" but "am I ahead of the part that calls?" — and the size you pick decides which part that is.
Try it
Set the call rate and the share of calls you beat; the gain flips sign at exactly half.
Common mistakes
- Checking back strong hands "to be safe" and missing value.
- Betting thin out of position into a player who raises a lot.
- Choosing a size so big that only better hands call.
- Betting thin against a player who never calls with worse.
In your hands
Hands from your library where the analysis flagged this:
Opens your analysis, filtered. You need to be signed in; nobody else sees your hands.
Related concepts
- Bet sizing and polarisationSmall, big or overbet: every size has a job, and the job depends on the board and on which hands you bet.
- Bluff-catchingCalling with a hand that beats only bluffs: the price says how often they need to be bluffing.
- PositionActing last after the flop is worth money: you see what your opponent does before you decide.