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The opening name after 1.d4 Nf6 2.c4 c5. It was first analyzed by Aaron Reinganum in 1825, who called it Ben-Oni (child of my tears, in Hebrew). His book was Ben-Oni oder die Vertheidigungen die Gambitzüge im Schach.
Not to be confused with the Old Benoni 1.d4 c5.