Bias in the ELO‒system of online chess
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چکیده
ELO is the key performance indicator in chess, a global and worldwide measure of chess skills and strength of chess play. Since their invention, ELO-systems are intended to be comparable and unbiased, so that chess players can know their level of play and can compare it among systems and internationally. Moreover, ELO is the defining feature of grandmasters with legal implications. Thus, it is highly important to only have unbiased ELO-system, whenever a terminology bearing ELO is used. However, most recent online chess sites seem to utilize highly biased ELO-system that can maybe not be compared to tournament or FIDE chess ELO-score systems. It could be that online-ELO systems are strategically biased to make all hobby players around the world appear less professional by systemically down-shifting the ELO-score system. This short report offers some insights about this potential ELO-deflation phenomenon in online chess. It can be shown that online ELO systems do not reflect real chess skill strength in ELO as measured by different methods: (1) game strength does not reflect tactical or strategic strength, (2) there is a shift in ELO-distribution between hundreds and up to thousand ELO-points of the average level player, e.g. FIDE RBB versus an online site, (3) Elometer, a scientifically approved and scientifically standardized method also reveal this dramatic discrepancy in ELO-reduction. The reason for this deprivation of ELO-points seems to be artificial ELO-scarcity that is introduced into the system whenever a new player enters the site and has to start with fewer ELO-points than his or her skill level. There are not enough aggregated ELO-points that mirror the sum of all chess skills in online chess and year after years it seems to worsen, while FIDE-ratings are rising slightly. Hence, this work reminds that the total ELO-points per rating system must be always adjusted. Millions of chess-players world-wide might be extremely underrated and their chess skills overlooked.
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Bias in the ELO-System of Online Chess
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