I saw a tiktok about some girl who was the daughter of two grand masters. Went deep into a rabbit hole of the world of Chess but I still cannot for the life of me understand this point system ?
In: 30
The Elo rating system (which isn’t all caps – it’s the inventor’s name, not an acronym) is a statistical method for comparing the skill of two players. The scale is calibrated such that a player ranked 400 points higher than their opponent is 10 tines more likely to win than the opponent.
Each game has some base value like 32 points. If a player has a rating 400 points higher than their opponent, then they expect to win 91% of the time, so they would risk 29 points, while the weaker player would risk just the remaining 3 points. After the game, the winning player gets their points back plus the points that the other player risked. Ties usually split the points evenly. Chess tournaments with several rounds will often wait to calculate rating changes until after the tournament to avoid rounding errors.
The Elo system is quick to calculate, but it makes some assumptions that are not always correct, so it is not a perfect measure of a player’s ability. In particular, a player’s ability can change over time and there is always some uncertainty that a player’s rating may not reflect their true ability. There are other systems like Glicko and Trueskill that try to account for these factors, but Elo is still widely used because of its simplicity and ease of use.
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