When official development of XBoard stalled after release of 4.2.7,
unofficial forks emerged further developing WinBoard without paying attention to XBoard.
Changes in the back-end even destroyed the possibility to build an XBoard from these modified sources.
XBoard 4.4.0 pulls some of these forks back into the main line of XBoard development,
by at least restoring the compatibility of the X11 front-end files with the common back-end,
even though most of the new front-end functions of WinBoard have not been ported yet.
In particular, XBoard 4.4.0 is based on the Winboard_x fork by Alessandro Scotti.
That means that a WinBoard built from these sources has all the enhancements associated with Winboard_x.
These include the auxiliary windows for engine output, move history and evaluation graph,
board textures and font-based rendering of pieces.
For further details, see the page on