Die Schwalbe
The search command is not correct.
COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND S='Les Tours de Force sur l'Échiquier'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT K = $$STRING1 AND S = $$STRING2 ÉCHIQUIER $$STRING3]