Folio Chess maps every named chess opening in the ECO (Encyclopedia of Chess Openings) database as an interactive force-directed graph — 3,704 nodes, each representing a single named variation. Nodes are sized by depth and connected to their parent line, with colors corresponding to ECO volume: teal for flank openings (A), orange for semi-open games (B), red for open games (C), yellow for closed games and the Queen's Gambit family (D), and slate blue for Indian defenses (E).

Built in TypeScript with a custom canvas renderer and force-directed physics written from scratch. Click any node on desktop to identify the opening, use the search field to find a specific line, or filter by ECO volume via the legend.

Folio Chess is the landing page for a chess study app in development. The full interactive version is best experienced on desktop.