Casino-ABC: Letter O

With the letter “O”, the Casino A–Z moves on to the next round. Once again, you’ll find terms from the world of poker and blackjack that regularly come up at the table. To help you keep track, we explain the most important “O” terms in a simple, clear, and practical way – so you’re perfectly prepared for your next visit to the MERKUR Casinos.

OASIS

OASIS is a central player protection system in Germany that applies across all forms of gambling – including casinos, slot machine gaming, online services, and sports betting.

Players can choose to self-exclude or may be excluded if a risk is identified. This exclusion then applies across all providers.

If you’d like to learn more about how OASIS works and what options are available, you can find all the details in our separate article on OASIS .

One-Gap

In poker, a one-gap refers to two starting cards with exactly one rank missing between them.

For example: J-9 or 6-4.

These hands have the potential to form a straight but require a bit more luck than directly connected cards.

Outrun

In poker, outrun means that an opponent ends up beating you even though you were ahead before. A poker hand isn’t decided until the final card is dealt – which is what keeps the game exciting until the very end.

Over / Under

Over/Under is a side bet in blackjack .

You’re betting on whether your first two cards will total over or under 13 points:

Over 13 = Over
Under 13 = Under

If the total is exactly 13, the bet is lost immediately.
It sounds simple, but it’s generally more suited for risk-seeking players.

Overcard

In poker, an overcard is a card in your hand that is higher than all the cards on the board.

Example: you hold Ace-King and the flop shows only lower cards → both are overcards.