Average Opposition

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Average Rating of Opponents

The assumption of this tie break is to calculate who played the toughest schedule based on their USCF ratings. Similar to the Solkoff system which bases it's calculations on total players scores, this system uses a sum (or average) of opponents ratings.

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 avg opponent rating + (2 ins - 3 losses)*400/rounds 5).

Once every unrated player has received a tentaive tie-break rating, use the opponents ratings for all the games, to determine the oppositions average rating (total up the opponents ratings and divide by the games played).

Example

Player A plays players with ratings if 1400, 1500, 1600 and 1700. Player A would have an average opponent rating of 1550 (1400+1500+1600+1700)/4=6200/4=1550