Performance of Opposition
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Oppostions Performance Tie Break System
The idea is to reward the player who played the toughest schedule based on their performance on the day of the tournament. The first step is to establish a rating for unrated players. This is done by finding the average rating of everyone in the tournament and adjust by the rated players performance v the unrated players. If an unrated player plays four games against rated players and scored an even 2-2 against them, he would receive a rating equal to the tournament average. The formula s actually games over .500 times 400 divided by the number of games against rated players. So if an unrated player scores 2-3 in a tournament with an average rating of 1500, his rating for purposes of calculating Performance of Opposition is 1420 (1500 + (-1)*400/5).
Once every unrated player has received a tentaive tie-break rating, use the opponents ratings for all the games, adjusted as above to determine the oppositions rating.
Examples
Example Player A scores wins over a 1400 & 1500, a draw with a 1600 and a loss against a 1700. Player A would have a performance rating of 1650 (1400+1500+1600+1700)=6200+(3-2)*(400/4)=1550+100=1650
