This is a Sugar front end to the gnuchess program. Some of the artwork comes from the Gcompris chess program. Other artwork was inspired by part from- https://web.archive.org/web/20130310093700/http://lovesexandthermonuclearwar.wordpress.com/2012/04/04/assorted-chess-tools/
More details on gnuchess can be found at:
http://www.gnu.org/software/chess/ and http://www.gnu.org/software/chess/manual/
Sugarchess is not a part of Sugar Desktop but can be added. Refer to the following links-
Detailed copyright and license information can be found /COPYING and /LICENSE. In the event this file has been separated from the rest of Sugar GNU Chess, please note that these files have been dual licensed under the Apache License v2.0 or GPLv3.