Glicko rating system

The Glicko system has been developed by Mark E. Glickman rating system that allows as the Elo system, the skill level to measure about chess players. The peculiarity of the system is the introduction of an additional variable, the RD (ratings deviation ). The Glicko system, as well as the development Glicko 2 is to find royalty-free and therefore particularly at online gambling sites. The formulas are given on the website of Mark E. Glickman.

Differences to the Elo system

As an extension to the Elo system Glickman introduces the RD (ratings deviation ) variable. This gives estimates of how exactly matches the current rating of the actual ( but unknown ) skill level. With a probability of 67 %, the actual skill level in the range of ± RD rating of, with 95 % in the range of ± 2 RD. If a player has a rating of about 1500 and a RD of 50, it shall be his actual skill level with a probability of 95 % in 1400-1600. If a player plays, decreasing in RD, since his rating number is more accurate with every game. He does not play, this rises again slowly over time. In addition, causes a high RD that his rating number changes more quickly.

Thanks to the introduction of RD is also ensured that the rating of an active player who plays with a new or inactive players, changes only slightly. This makes sense, since the strength of the new or inactive player is not known accurately enough and the result is therefore not says a lot about the strength of the active player.

Glicko 2

The Glicko - 2 system performs in addition to RD also a volatility rating of a. The more constant the player plays, the less this.