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The search command is not correct.
COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND A='Djukic, Milenko' AND NOT S='L'Italia Scacchistica'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT K = $$STRING1 AND A = $$STRING2 AND NOT S = $$STRING3 ITALIA SCACCHISTICA $$STRING4]