Rating System

Dave Casper used a variation of the Elo algorithm to determine player ratings. This rating system is being used by Warplanner and is generated automatically based upon a player's win/loss record.

Dave writes:
I found the exact formula used to calculate Elo ratings, so it is no longer necessary to use the more coarse-grained table from the first ULTRA. Hence you always gain slightly more by beating a player rated N+1 than you do from beating a player rated N. With the older table, there was a large plateau between -100 and +100, while now the point awards vary smoothly. Although this has some effect on the numbers, it doesn't affect the overall order much. For those who are curious, the formula is:

delta_R =	opponent_rating - player_rating
expected_win =	1./(1.+10^(delta_R/400.))
actual_win =	1.0 for a VL10 (decisive) loss 0.9 for a VL8 ... 0.5 for a draw ... 0.2 for a VL8 loss 0.1 for a VL10 (decisive) loss
scenario_weight =	4 for A3R/RS campaigns and 8 for Global War/AWAW games.
RATING =	old_rating + scenario_weight*32*(actual_win - expected_win)

When several players play on a side, such as in a Global War/AWAW game, their ratings are averaged, and the rating change is divided evenly among them. Multi-player victory conditions are not supported. New players begin with a rating of 1600.

Note:  If you have a pre-existing rating, you need to create an account first, before John Stathakis can manually apply your rating value. Currently no provision is in place for an automatic porting of player ratings.