Game of chance

A game of chance is a game whose outcome depends on randomness rather than the player's skill. The outcome is decided by a random number generator (RNG), which ensures every spin or deal is independent and unpredictable.

Classic games of chance are slots, roulette and the lottery. Some table and card games (e.g. blackjack, poker) also involve an element of skill, but in a pure game of chance strategy does not change the outcome.

In Estonia, only casinos licensed by the Tax and Customs Board, whose RNG is independently tested, may offer games of chance. This ensures the games are fair and the outcomes genuinely random. A game of chance is entertainment, not a source of income.

What randomness means in practice

Every spin or deal is independent of the previous one. Example: European roulette has 37 numbers, of which 18 are red, so the probability of red is 18/37, about 48.6%. Even if red has come up ten times in a row, the probability on the next spin stays the same. The belief that "black must come now" is called the gambler's fallacy; see Wikipedia: Gambler's fallacy.

The same applies to slots: a "hot" or "cold" machine is a myth. RTP is a theoretical average over a very large number of spins, not a promise for a single session, and volatility tells you how large the swings can be.

Chance and skill

In blackjack and poker your decisions affect the result, but the cards remain random. In blackjack correct strategy reduces the house edge but does not remove it, and in poker you play against other players while the casino takes a fee. In a pure game of chance, such as a slot or roulette, a player cannot gain an edge through strategy in the long run.

What this means for you

• Anyone selling a "sure system" or "signals" is selling an illusion.
• Independent testers check that the randomness is fair, for example eCOGRA and Gaming Laboratories International. An Estonian online casino also needs an operating licence; see licence.
• A game of chance is not a source of income. If you notice you are playing to win back a loss, set a limit and turn to 15410.ee for help.

For an explanation of the rules and mathematics, see casino game mathematics. General definition: Wikipedia: Game of chance.