What constitutes a chess ecosystem? I'm been thinking about the metrics to measure to make a "Best Cities for Chess" list. Assume I'm going to call these cities as "Chess Ecosystems", what are some of the things that would indicate its health? 

ex: Number of FIDE rated players, tournaments organized every year, coaches available, etc. 

What will you add to this list ?
The parameters I can think of: 

Number of


Chess club members
FIDE rated players
FIDE titled players
Grandmasters
Female players
Tournaments
Seminars / lectures


I'm not sure how to convert these parameters into a final score, nevertheless I'm curious how the list of best chess cities would look like. I would expect Moscow to be clear number one (many resident grandmasters, many tournaments). I'm also wondering how good Saint-Louis would score.