fide - Which countries have the most GMs per capita? - Chess Stack Exchange

This interesting site has a "World map of chess grandmasters" which looks like this: Apart from the fact that Russia is very wide (it looks like it crosses 10 time zones), it looks like

Total number of GM:s per European country. (Both active and inactive) via ig @welcometo.europe : r/chess

Colorado State Chess Association

Palau Chess: December 2019

2011 - Chess Life 03, PDF, Chess

Magnus Carlsen net worth and things to know about the chess genius

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The gender gap in top-level chess

FIDE Chess Players by Country : r/MapPorn

Building and maintaining an opening repertoire can be a demanding task -- for a start there are an enormous number of different lines to choose from.

Starting Out: 1d4 : A Reliable Repertoire for the Improving Player (Starting Out - Everyman Chess)