Free, open-source chess platform with zero ads, zero paywalls, and a full suite of tools.
The world's largest chess platform with play, tactics, courses, and live event coverage.
Chess training site known for its tactics trainer, opening trainer, and large game database.
Chess learning platform using spaced repetition for openings, tactics, and endgames.
Historical game database with over 10 million games, player bios, a forum, and a puzzle archive.
Free online database of millions of master games with a search interface and opening statistics.
AI engine trained to predict human moves at specific Elo levels, for realistic sparring.
Cloud database of 40M+ chess positions with optimal engine moves, built for opening research.
Personalized opening explorer that analyzes your games to show your actual opening stats.
Free open-source opening repertoire trainer with spaced repetition, for any PGN file.
Opening explorer that visualizes common paths through the opening phase as a decision tree.
Free chess training combining spaced repetition for openings, blindfold tactics, and endgames.
Searchable game database with millions of games, an opening explorer, and player statistics.
YouTube chess channel by Stjepan Tomic with opening repertoire videos and middlegame concepts.
An interactive force-directed graph of all 3,704 ECO chess openings, colored by volume.