ECO/Nomenclature Archive
Openings classified by ECO code. From Chess Archaeology.
ECO Codes
List of all openings by ECO code, with moves. Opening variations not named. From the Exeter Chess Club.
Free-definition.com
Encyclopedia style entries with hyperlinks to related topics.
Philatelic Site of Riccardo Andreis
Chess and Philately - Stamps, phone cards, postcards, old prints, magazines.
Statistics & History of Chess
Statistics on games, players, record holders, and ratings.
Wikipedia : the free encyclopedia
Chess rules, concepts, and history. Maintained by volunteers from the general public.
World Clock : time zones
Find current local time in different cities and countries, all time zones. Useful for calculating when online games in major tournaments will start in your local time.