Sources & credits
Tabiya is free. Every move in an official course comes from one of the sources below: a named line in the opening reference, or a move strong players actually played in tournament games. Nothing is made up.
Data and software
Opening names, ECO codes and the named lines every course starts from.
Over-the-board tournament games (both players 2200+, January 2020 to October 2026). Used for the moves masters play beyond the named lines and for the master statistics shown with each move. Our derived move statistics are shared under the same license.
The tactics puzzles in Puzzles mode, unmodified, with a link to each source game.
The evaluation bar and the Arena opponent. When courses are built, it only chooses between sourced moves and removes lines that would teach a mistake; it never adds a move.
Move legality and notation.
Piece sets
Used unmodified, taken from the Lichess repository (lichess-org/lila).
- Classic (cburnett)Colin M.L. Burnett · GPLv2+
- MeridaArmando Hernandez Marroquin · GPLv2+
- ChessnutAlexis Luengas · Apache 2.0
- Fantasy, Celtic, SpatialMaurizio Monge · MIT