Contract bridge can be a friendly, informal social game, or a highly competitive mind-sport when in formal club or tournament play. The rules require players to conduct themselves ethically and to be courteous at all times. The rules of the game and expectations for ethical play are codified in the official Laws of Duplicate Contract Bridge and its published interpretations; the rules define which actions at the table are and are not permitted and remedies for rule infractions and irregularities. Players are expected to respect the norms of social courtesy and behavior; duplicate bridge sponsoring organizations (clubs, regional, national, zonal and world organizations) can define additional standards for player's conduct, including the penalties for violation of personal conduct such as rudeness and other breaches of discipline not covered by applicable civil laws. Some aspects of the rules may be interpreted more strictly in a high-level tournament than in an informal social game.