...From the author's site ( http://www.fzort.org/mpr/projects/vulcan/ ): "vulcan lets you play against the computer a chess variant inspired by a certain well-known science fiction TV series."
Critical Patches:
> Mouse Bug fix (X11 only) -- Significantly improves GUI responsiveness to mouse.
> King Bug fix -- Prevents program crash due to a computer's piece capturing the player's king.
Feature Patches:
> Clock Option (X11 only) -- Adds an option to show or hide the clock showing the elapsed time for each player.
NOTE:
If the source code tarball for Vulcan isn't available from the author's site, it can be found at http://web.archive.org/web/20110726072225/http://www.fzort.org/mpr/projects/vulcan/