In Expresso, your results graph can show losses even when you’re playing well. Understanding CEV separates real performance from variance noise.
What Is CEV (Chips EV)?
Chips EV (CEV) is the chip expectation — it estimates how many chips you should win on average based on your decisions, independent of actual card outcomes.
Concrete example: you go all-in with 70% chance of winning. Your CEV is +70% of the pot regardless of whether you actually win or lose that hand.
What CEV to Aim For?
On Winamax with 500 starting chips per player (1500 chips total), you need to win 35.8% to break even after rake.
Minimum CEV = 35.8% × 1500 - 500 = 537 - 500 = 37 chips per game
In other words: if your CEV is above +37-40 chips per game, you’re a long-term winner.
Why Graphs Lie to You
Here’s what simulation of 100 identical players (same CEV) shows:
200 games: impossible to distinguish a winner from a loser. Variance dominates completely.
1,000 games: a trend begins to emerge, but outliers are everywhere.
10,000 games: the CEV curve converges to the real value. This is where you can start trusting your results.
Practical consequence: don’t panic over a 30-40 buy-in downswing over 2,000 games — it’s statistically normal.
Downswings Are Normal — Even for Good Players
A player with good CEV (+59 chips/game) over 2,000 games can experience:
A 30 buy-in downswing in 50% of simulations
A 60 buy-in downswing in 10% of simulations
An 80+ buy-in downswing in the worst-case scenarios
These numbers explain why a 100-150 buy-in bankroll is essential for Expresso.
Summary
Track your CEV, not your euro results graph — especially over small samples.
Minimum CEV for profitability on Winamax: ~+37-40 chips/game
30-60 buy-in downswings are statistically normal in Expresso
Use Swongsim to calibrate expectations and size your bankroll correctly
