Chess piece sets for /chess, copied unmodified from Lichess (https://github.com/lichess-org/lila, public/piece/).
Only sets whose licenses allow commercial use (the site carries ads) are included.

cburnett  Colin M.L. Burnett              GPL v2 or later   (the GPL text: /stockfish/18.0.8/COPYING.txt)
merida    Armando Hernandez Marroquin     GPL v2 or later
mpchess   Maxime Chupin                   GPL v3 or later
chessnut  Alexis Luengas                  Apache 2.0        (chessnut/LICENSE.txt)
fantasy   Maurizio Monge                  MIT               (fantasy/LICENSE.txt)
spatial   Maurizio Monge                  MIT               (spatial/LICENSE.txt)
celtic    Maurizio Monge                  MIT               (celtic/LICENSE.txt)

Licenses as listed in lila's COPYING.md (checked 12 October 2026). Don't add sets marked CC BY-NC-SA,
"non commercial" or "freeware": those can't go on a site with ads.