Running it without any other command was non-descript saying command not found (but it is definitely installed according to package manager) so here is the verbose:
Traceback (most recent call last):
File "/usr/bin/pychess", line 197, in <module>
from pychess.System import conf
File "/usr/lib/python3.9/site-packages/pychess/System/conf.py", line 27, in <module>
configParser.read_file(fh)
File "/usr/lib/python3.9/configparser.py", line 718, in read_file
self._read(f, source)
File "/usr/lib/python3.9/configparser.py", line 1070, in _read
raise DuplicateSectionError(sectname, fpname,
configparser.DuplicateSectionError: While reading from '/home/diggis/.config/pychess/config' [line 100]: section 'ICC' already exists