Cburnett chess piece artwork, by Colin M. L. Burnett.
Licensed under Creative Commons Attribution-ShareAlike 3.0 Unported.
https://commons.wikimedia.org/wiki/Category:SVG_chess_pieces
https://creativecommons.org/licenses/by-sa/3.0/
Obtained from python-chess 1.11.2 chess.svg.PIECES. Artwork unchanged.