The International Contender Class Rules are regularly reviewed. The aim is to both develop the class and keep old boats competitive.
The latest class rules of the International Contender Class are available on World Sailing: https://www.sailing.org/tools/documents/CON2012CR081111-.pdf
Maintaning the Class Rules is one of the responsibilities of the International Contender Association (ICA). The Rules that govern the functioning of the Association are defined in the Association Rules.
Every year a World Championship is being held. These truely international events as well as European Championships are governed by the following rules: ICA Championship Rules 2021