The Elo rating system is a method for calculating the relative skill levels of players in two-player games such as chess. ELO rating systems are used both in international chess and many other sports.
A players ELO arises from its successes against other players whose ELO points are being considered in the calculation. Details of ELO calculation are explained on Wikipedia: Wikipedia: Elo rating.
For Players not yet finished a tournament, no ELO points will be displayed. For such Players an ELO value of 1500 for quick chess and 1800 for correspondence chess will be taken as basis for the calculation of new ELO points.
At Chessgamble you can play tournaments with a variety of attributes:
Besides you can try other game variations without thinking "I would better not do that, because I will spoil my ELO rating".