Round-robin
In round-robin tournaments, each participant plays every other participant an equal number of times. Round-robin tournaments involving four participants are known as quads. Round-robin tournaments are often used for small groups because the element of luck is reduced when every player plays everyone else. Rating categories are sometimes used to separate players of different levels into different round-robin groups. The World Chess Federation, the Australian Chess Federation, and the United States Chess Federation all use different categorization scales to distinguish player ability. Similar to the Round-robin style is the Scheveningen system. The Scheveningen system is often used to face two chess teams against each other, where each player on one team plays each player on the other team.
Read more about this topic: Chess Tournament, Formats, Systems