1 April 2026 | 3 min read | Author: Aleksi Koskinen, Game mathematics and responsible gambling
Sisu is a virtue where effort changes the outcome: practice improves performance, repair improves the work. In gambling that condition does not hold, which is exactly why persistence turns against a player at the table.
Why ”one more spin” is the wrong place
The best-known error is the gambler's fallacy: the belief that a long losing run makes a win more likely. It does not. Every spin is drawn separately, and sisu does not change how a random number generator behaves. Two hundred spins without a result are not a debt the game repays.
A longer session does not improve the odds. It increases the amount wagered – and the theoretical loss grows with it.
The price of the game in numbers
| Game | House edge | Theoretical loss per €1,000 wagered |
|---|---|---|
| Blackjack with basic strategy | about 0.5% | about €5 |
| European roulette | 2.70% | €27 |
| Slot with 96% RTP | 4.00% | €40 |
| American roulette | 5.26% | €53 |
These are long-run averages. A single evening can land far from them in either direction, but the direction is always the same.
What sisu is good for
- Setting the limit in advance: the amount and the time, before the first spin.
- Holding that limit when it is boring. The hardest moment is not a loss but a win, after which continuing feels reasonable.
- Stopping mid-session.
- Choosing the game: the return to player is in the info panel, and checking it takes half a minute.
What does not work
- Doubling the stake after a loss. After ten losses in a row the stake is 1,024 times the first one, and the table limit arrives before that.
- A ”hot game”. Previous spins say nothing about the next one.
- Chasing losses. It raises stakes exactly when judgement is weakest.
Questions and answers
Does persistence help you win?
No. It helps you stay with a plan, but it changes the probability of no spin.
Is one game better for a persistent player?
In games where decisions matter, correct play reduces the house edge. That is skill, not sisu.
When should you stop?
When the stake rises after a loss, when the session runs past the agreed time, or when money set aside for something else goes into play.
Read next
Jackpot mechanics are covered in Progressive jackpots, and the promises of technology in AI and VR in the casino.
Alertness and breaks are covered in The coffee break and the session.
