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Algorithms

TrueSkill
- https://en.wikipedia.org/wiki/TrueSkill
- Microsoft Research - TrueSkill™ Ranking System: Details
Reddit's "Hot Formula"
- Evan Miller - Deriving the Reddit Formula
  - This is really well-written and interesting. I read the first half and the conclusion. I should read the rest at some point.
Reddit's comment-sorting system
- 2009.10.15 - Randall Munroe / Reddit Blog - reddit's new comment sorting system

Programming

skills - Python implementation of the TrueSkill, Glicko and Elo ranking algorithms

Articles