whole_history_rating

Whole History Rating

A system for ranking game players by skill, based on Rémi Coulom's Whole History Rating algorithm, with modifications to support handicaps.

Developed for use on GoShrine, but the code is not go specific. It can support any two player game, as long as the outcome is a simple win/loss.

Installation

• gem install whole_history_rating

Usage

require 'whole_history_rating'

@whr = WholeHistoryRating::Base.new

# WholeHistoryRating::Base#create_game arguments: black player name, white player name, winner, day number, handicap
@whr.create_game("shusaku", "shusai", "B", 1, 0)
@whr.create_game("shusaku", "shusai", "W", 2, 0)
@whr.create_game("shusaku", "shusai", "W", 3, 0)

# Iterate the WHR algorithm towards convergence with more players/games, more iterations are needed.
@whr.iterate(50)

# Results are stored in one triplet for each day: [day_number, elo_rating, uncertainty]
@whr.ratings_for_player("shusaku") => [[1, -92, 71], [2, -94, 71], [3, -95, 71], [4, -96, 72]]
@whr.ratings_for_player("shusai") => [[1, 92, 71], [2, 94, 71], [3, 95, 71], [4, 96, 72]]

Enjoy!

-Pete