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