Alpha (Break-even Frequency)

Terms · updated 2026-03-08

What is Alpha?

Alpha — the break-even frequency at which a bet (or bluff) needs to succeed for its expected value (EV) to be zero.
Used for calculating:

• Optimal bluff frequency
• Required fold frequency vs a bet
• Balance between value bets and bluffs

Formula

For a bet:

Alpha = Risk / (Risk + Reward)

Where:

• Risk = bet size
• Reward = current pot size

Example

Player bets half pot (0.5 pot):

• Pot: 100
• Bet: 50
• Pot after bet: 100 + 50 = 150
• Alpha = 50 / (50 + 100) = 0.333 = 33%

➡ The bet must work at least 33% of the time to break even.

Alpha for Common Sizings

How to Apply

• Bluffing: If you think the opponent folds more often than Alpha → bet is +EV.
• Defending: If your hand wins more often than Alpha → call is +EV.
• Sizing: Adjusting bet size changes the required success frequency.

Practical Scenarios

Bluff

You bet 1 pot (100 into 100) → Alpha = 50%.
If opponent folds more than 50% → bluff is profitable.

Call

Opponent bets 33% pot → Alpha = 25%.
You need to win 25%+ to make a profitable call.

Important Notes

• Alpha ≠ hand equity.
• Alpha is the threshold between profitability and loss.
• Helps to quickly evaluate decisions and exploit weak opponents.