After all the objections raised when this feature was removed I find that this now has indeed returned however it now relates to your last 90 day stats not as it originally was over all time,my question is.................

1.When exactly was this done?.

2.Why was this changed?.

3.Where can one find pre-advisories that this was happening?.

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2011 04 27 or before. http://www.chess.com/forum/view/help-support/average-opponent

Post # 4 by staff member dajacca 2011 04 27

"FYI - the Average Opponent stat only takes into account games in the past 90 days now"