Ulrike Fischer 2006-2019
Get xskak with the package manager of your tex system. If you want to install manually download xskak.dtx and xskak.ins and TeX/LaTeX on xskak.ins to unpack the dtx. Put the three extracted files in tex/latex/xskak/ and update the filename database.
The dtx-file doesn't contain any documentation. So running LaTeX on it makes no sense!
xskak.pdf.
The main point of xskak is to save informations about a chess game for later use e.g. to loop through a game to make an animated board. It also extend the input that the parsing commands can handle and offer an interface to define and switch between indefinite levels of styles.
xskak uses some primitives of e\TeX. It needs version 1.4 of skak, a recent version of chessfss and xkeyval, version 1.5 of chessboard (which in turns needs xifthen and pgf).