Almost all rules are of the form "if (trigger) then (consequence)", for example "If a 7 is played, reverse the direction of play." Common triggers include the ranks, faces and colours of played cards (and how those values relate to the current top card), and changes between suits and parities (odd to even, even to odd), but they may also be triggered by non-card events such as speaking (or failing to speak) a certain word when playing a card. Consequences are often simply "this card may not be played", but may alternatively include the drawing of extra cards, the swapping of cards between players' hands, and alterations to the turn sequence. Bartok can be made into a drinking game if the consequence of a play is that a player must take a drink.