====== Trueskill ======

  * https://www.microsoft.com/en-us/research/project/trueskill-ranking-system/?from=http%3A%2F%2Fresearch.microsoft.com%2Fen-us%2Fprojects%2Ftrueskill
  * [[https://www.microsoft.com/en-us/research/publication/trueskill-2-improved-bayesian-skill-rating-system/|Minka, Tom, Ryan Cleven, and Yordan Zaykov. "Trueskill 2: An improved bayesian skill rating system." Tech. Rep. (2018).]]
  * [[https://papers.nips.cc/paper/3079-trueskilltm-a-bayesian-skill-rating-system.pdf|Herbrich, Ralf, Tom Minka, and Thore Graepel. "TrueSkill™: a Bayesian skill rating system." Advances in neural information processing systems. 2007.]]
  * Trueskill 구현
    * https://dotnet.github.io/infer/
      * [[https://docs.microsoft.com/ko-kr/dotnet/machine-learning/how-to-guides/matchup-app-infer-net|Infer.NET 및 확률적 프로그래밍을 사용하여 게임 대전 목록 앱 만들기]]
    * https://trueskill.org/

<code python>
# pip install trueskill

from trueskill import Rating, quality_1vs1, rate_1vs1
alice, bob = Rating(25), Rating(30)  # assign Alice and Bob's ratings
if quality_1vs1(alice, bob) < 0.50:
    print('This match seems to be not so fair')
alice, bob = rate_1vs1(alice, bob)  # update the ratings after the match, alice win
# alice, bob = rate_1vs1(alice, bob, drawn=True)  # drwan
</code>