Term
Variance
The statistical noise around your edge — the reason short samples lie.
Definition
Variance measures how much actual betting outcomes deviate from their expected value. High-variance strategies (large stakes, long odds, parlays) can lose for hundreds of bets despite being +EV. Variance control — staying within drawdown rules and avoiding tilt — is a 20-point component of the Bettor Score.
Example
A +5% EV strategy on coin-flip-style markets still has a roughly 30% probability of being in drawdown after 100 bets purely from variance. This is why the 25-pick minimum exists — smaller samples cannot distinguish skill from noise.
Why it matters
Variance is the reason a +EV bettor can still fail a Challenge: over-staking magnifies normal noise into rule-breaking drawdowns. Variance control rewards bettors who size correctly relative to edge.
Related terms
Expected ValueEV
A probability-weighted average return — the long-run profit or loss per unit staked if the same bet were placed indefinitely.
Drawdown
The percentage decline from a bankroll’s highest value to its current value — measured per phase and per day in the Crypto Bet Capital ruleset.
Kelly Criterion
A formula that prescribes the bet size which maximises logarithmic bankroll growth given a quantified edge and odds.
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