How can I simply and sustainably remove Chess from my macBook Air, Mojave?
Tricky to keep them from coming back.. I would create a LaunchAgent to monitor the path(s) to the apps, &amp; include a "sudo rm -r /path/to/app" command to delete them.

https://www.macissues.com/2015/02/02/how-to-use-launchagents-to-monitor-folder-contents-in-os-x/

You would likely have to keep SIP disabled (but even this can be re-enabled through OS updates!)