Why is Chess.app "required by OS X"?
I don't use it, and I can't delete it. Is it really required by the operating system?
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Later Mac OS versions have SIP enabled, which prevents you from simply
sudoing your troubles away. What you have to do now is:
Cmd-R, which should eventually boot you into recovery mode.
csrutil disableto disable SIP.
cd /Applications/ && sudo rm -rf Chess.app/
csrutil authenticated-root disabledmust also be run, and the root volume must be mounted to a temporary mount point with
sudo mount -o nobrowse -t apfs [path to disk] [mount path], then the volume must be blessed after editing it with
sudo bless --folder [mount path]/System/Library/CoreServices --bootefi --create-snapshot(taken from here