Move Validators & Rules Engines – Learn Chess

About Move Validators & Rules Engines

Libraries that enforce chess rules and validate moves.

Row Types:

Special Indicators:

Use the toolbar's Info button to toggle this panel.
Use Tags toggle to enable/disable row color-coding.
Use Sub-tags toggle to show/hide special indicators.
Return to ← Home to explore all categories.

Favorites

No favorites yet. Tap ☆ on any game.

Move Validators & Rules Engines

Chess.js — De‑facto JS rules engine & PGN utilities.
npm: chess — JavaScript chess library (rules & utils).
python-chess — Full‑featured rules/PGN/engine/TB.
chessops (TS) — Typed rules with variants support.
Sunfish (Python) — Tiny engine useful for rules logic.
Fairy-Stockfish (variants) — Rules/engine for many variants.
ChessRulez (Java) — Java chess library with PGN/FEN.