|automated match resolution|
No one likes unfinished matches, but sometimes games get interrupted and cannot be finished in a timely manner. Especially in money games, no one wants their reserves tied up waiting for an opponent to reappear. At the same time, everyone wants to ensure that they get full equity, reflecting the current score and position in each game.
Note that in order to prevent certains types of rating manipulation, rated matches are resolved by AMR even if one of the players becomes a guest before resolution takes place.
Players are encouraged to complete the matches themselves during the period between initial notification and automated resolution. Matches unfinished after the required waiting periods resolved by a robot evaluator, and ratings points assigned based on match winning chances (MWC). After resolution, results are posted to the match database. Involved players are notified via GamesGrid Message of the action taken.
The ratings difference between the players is used to calculate the ratings changes that would apply if the match were played to conclusion. If both players have more than 500 points experience, then the calculated ratings changes will be symmetric; i.e., player A will win as many points as player B loses, and vice versa. Players with less than 500 points experience win or lose ratings points at a faster rate. (The rate of change decreases to the standard rate of change as a player's experience approaches 500 points).
For example, if player A is rated 100 points higher than player B, the win/lose figures for a 7 point match are
winA = +4.4 loseA = -6.1
Match winning chances for each player (MWCp) are estimated by the robot's 2-ply-lookahead evaluation (the highest evaluation level) of the current match score and position, adjusted for the ratings difference between the players. The sum of the MWCp for all players is 1.00 (100%).
To continue the example, if player A is estimated to have 75% match winning chances, then
MWCA = 0.75
Since the match was not played to conclusion, the ratings change for each player (DRp) is
DRp = MWCp*winp - (1-MWCp)*losep
To continue the example, The ratings changes would be
DRA = 0.75*4.4 - 0.25*6.1 = +1.775
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last modified: 2006-02-03