xboard: xboard 4.9.1 (X Window System Chess Board)  
xboard:  
xboard: XBoard is a graphical user interface for chess in all its major forms,
xboard: including international chess, xiangqi (Chinese chess), shogi (Japanese chess)
xboard: and Makruk, in addition to many minor variants such as Losers Chess,
xboard: Crazyhouse, Chess960 and Capablanca Chess. It displays a chessboard
xboard: on the screen, accepts moves made with the mouse, and loads
xboard: and saves games in Portable Game Notation (PGN).
xboard: 
xboard: 
xboard: https://www.gnu.org/software/xboard/

