Die Schwalbe

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The search command is not correct.
COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT K='Figurenfang' AND S='Kagan's Neueste Schachnachrichten'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT K = $$STRING1 AND NOT K = $$STRING2 AND S = $$STRING3 S NEUESTE SCHACHNACHRICHTEN $$STRING4]