Prostitution has been legal in Amsterdam since 2000, so a good percentage of the current sex workers were born into that world. Has someone done a case study on the long term effects?
It seems like ELO skill ratings fall apart when comparing players of two different eras, since ELO Ratings involve the skill level of your opponents too.
Maybe a better metric would be running both players games through a computer to see the "%best move" metric?
Seems like statistics would help figure out if it was coincidence. What are the odds that ~6 months worth of daily crossword answers will contain 6-7 specific commonly used words?