Range-Narrowing Information Model
Use each action to narrow possibilities while concealing your own
- Difficulty
- Moderate
- Time to result
- ~weeks to results
- Steps
- 5
- Confidence
- 98%
Boeree describes poker as a repeated information-narrowing problem. At the start of a hand, an opponent could hold any legal two-card combination, so their range is effectively wide open. Each bet, check, position, and change of pace supplies evidence that can remove some possibilities and strengthen others. The player weaves those clues into a smaller set of conceivable value hands and bluffs rather than pretending to know one exact hand. At the same time, the player tries to keep their own range wide and difficult to read. The mechanism generalizes to uncertain competitive decisions: maintain a live set of hypotheses, update it from behavior, and manage the information you disclose.
Origin
Boeree uses ranges to explain the first stage of teaching Tim Ferriss serious poker.
Core principles
- 01Begin with the full set of possibilities
- 02Update the possible range after every informative action
- 03Combine multiple clues rather than relying on one signal
- 04Extract information while revealing as little as possible
How to run it
- 1
Set the initial range
List every plausible state before interpreting the other person's behavior.
Pro tip Start broad enough to avoid locking onto a favorite explanation.
Watch out Do not confuse a possibility with a prediction.
- 2
Collect behavioral evidence
Notice actions, timing, position, and changes from prior behavior that reveal information.
Pro tip Pay attention even when you are not directly involved in the current action.
Watch out One dramatic cue may be less reliable than a sequence.
- 3
Narrow competing explanations
Remove states that no longer fit and separate credible strong positions from credible bluffs.
Pro tip Ask what story the full sequence tells.
Watch out Do not force the evidence into one exact answer too early.
- 4
Manage your own signal
Choose actions that gather useful information without unnecessarily exposing your own position.
Watch out A readable pattern lets an opponent narrow your range in return.
- 5
Update continuously
Recalculate the plausible range whenever new evidence arrives.
Pro tip Keep earlier evidence available while giving fresh evidence appropriate weight.
Watch out A range that never changes is not an inference model.
In the wild
Boeree explains that an early pre-flop raise suggests stronger cards. If an ace then appears and the player slows down, that new action may reduce the likelihood of an ace and make pocket pairs such as nines or tens more plausible.
→ The full betting sequence narrows the opponent's conceivable value hands and bluffs.
Common mistakes
Putting someone on one exact hand
Incomplete evidence usually supports a range of possibilities rather than certainty about one state.
Ignoring actions outside your turn
Boeree says valuable information is exchanged even when a player is not in the hand.
Is it for you?
Best for
Competitive situations where actions reveal partial information and several explanations remain possible.
Not ideal for
Situations with complete information or where another person's actions carry no reliable signal.
From the transcript
“And then as the hand progresses, basically, I want to narrow down the perceived range that I think you could have.”
“while extracting information out of your opponent.”
“You know, weaving together bits of evidence to be able to narrow down people's ranges and put them on like conceivable bluffs versus conceivable strong…”
From the episode
#611: Liv Boeree, Poker and Life — Core Strategies, Turning $500 into $1.7M, Cage Dancing, Game Theory, and Metaphysical Curiosities
Liv Boeree