This is a bugfix release to 4.5.0. Here are some details:
Short description:
XBoard is a graphical user interface for chess in all its major forms,
including international chess, xiangqi (Chinese chess), shogi Japanese
chess) and Makruk. Many variations of chess are also supported.
Web page:
http://www.gnu.org/software/xboard/
Download at:
http://ftp.gnu.org/gnu/xboard/
Development at:
https://savannah.gnu.org/projects/xboard/
What's new?:
http://www.gnu.org/software/xboard/whats_new/4.5.1/
regards
Arun Persaud