Die Schwalbe

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The search command is not correct.
COMMENTDATE>=20200919 AND NOT S='Sammlung leichterer Schachaufgaben III' AND S='L'Italia Scacchistica'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT S = $$STRING1 AND S = $$STRING2 ITALIA SCACCHISTICA $$STRING3]