Die Schwalbe
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COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND S='Illustrated London News' AND A='Lucas, ' AND S='Chess Player's Chronicle'
atomic expression must have form 'field = value' [( COMMENTDATE >= $$NUMBER0 AND NOT K = $$STRING1 AND S = $$STRING2 AND A = $$STRING3 AND S = $$STRING4 S CHRONICLE $$STRING5]