Rosenkrantz lived in Moscow following the First World War and Russian Revolution and participated in several Moscow tournaments. He took 5th in 1921 (Moscow City Chess Championship, Nikolai Grigoriev won), took 5th in 1924 (Nikolai Zubarev won), took 14th in 1925 (Moscow-ch, Aleksandr Sergeyev won), tied for 8-9th in 1926 (Moscow-ch, Abram Rabinovich won), and shared 6th in 1928 (Trade Unions-ch, Grigoriev won).