Board Game Arena

The numbers follow directly from the Elo formula. Gaining 6 for a win and losing 37 for a loss means the system expects a win about 86 percent of the time against that opponent, roughly 37 divided by 43. Holding a rating steady requires matching that expected rate, so climbing requires beating it. A...

FrankJones's point about fast real time is the key one. Chess clocks solved a similar problem with a small increment added for every forced action, and the same idea would fit here: a fixed bonus, for example 20 or 30 seconds, whenever a player has to act outside their own turn because of an opponen...

The 90 percent cutoff makes sense, since conceding during the final scoring mostly serves to deny the opponent a proper finish. The early window is harder, because, as lefalaf says, the other player may want to play a weak position out. One middle ground would be to make an early concession count as...

On tbhp's point, team rating systems used in competitive games, such as TrueSkill, compare the combined strength of each team rather than teammates against each other. Each player then moves according to the team result and to how uncertain their own rating is, so a newer player moves faster than an...