@pxeger Could you please install python-chess under Python 2? Since it's no longer on PyPI, this would require doing git clone --branch 0.23.x https://github.com/niklasf/python-chess.git and then putting that repo's chess subdirectory wherever Python 2 looks for its imports – I think that would either be /usr/local/lib/python2.7/lib-dynload or /usr/local/lib/python2.7/site-packages