AlphaGo
AlphaGo is a computer program developed at DeepMind that plays the board game Go, and was the first computer program to beat a professional Go player - a decade before expected.
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TrueSkill Skill Rating System
TrueSkill is a skill rating for games that generalises the popular Elo rating system known from chess to include uncertainty estimates of player ratings, to allow for estimating individual ratings from team outcomes even with more than two teams. TrueSkill was first used in the Xbox 360 title Halo 3 and has since been used by a variety of Xbox 360 titles.