How can I remove Chess from my mac?
Chess.app is, as everything else installed by default, protected by SIP and can't be removed. If you absolutely want to reclaim the 5mb used by the application you can


Reboot into Recovery Mode to disable SIP
Reboot normally, log in and remove Chess.app
Reboot into Recovery Mode to enable SIP
Reboot normally
(and then repeat this with every macOS upgrade)


See How do I disable System Integrity Protection (SIP) AKA &quot;rootless&quot; on OS X 10.11, El Capitan? for details about disabling/enabling SIP.