Can chess.com relate their rating to an individual abstract I.Q.
Not with any degree of accuracy. The "problem" here is that people get better with practice. If you play 500 games of chess, memorize some openings and endgames, use the Tactics Trainer, etc., you will not be inherently more intelligent, but you will probably get better at chess and your rating will go up.


Can chess.com relate their rating to an individual abstract I.Q. Somehow I believe that skilled player must have high abstract reasoning. Every puzzle require intelligence in solving. Every game I believe need abstract intelligence. I hope a study will be done with regard to this subject for all people to know. With it, chess has it's valid purpose in the world and eventually be alive and kicking again.