It looks like you installed xapps-git from the aur. I can’t find an arch package or AUR package called xchess . There are many packages that depend on xapps so it may have been pulled in by one of those. xapp was added to the arch linux community repository yesterday by the same maintainer as xapps-git. I believe they accepted the aur package in to the community. Since arch linux likes to keep things simple (and within their repositories) it is asking if you want to replace the AUR version for the official community repository package.