...Gurdjieff’s group in Moscow. Among them was Alexander Nikanorovich Petrov, one of the chief pupils there. Physically, he was like a healthy young bull, and, as I came to learn, he had a very intelligent mind and was highly gifted in mathematics and engineering.
He was one of Mr. Gurdjieff’s favourite pupils, with whom he worked much on selfconcentration and self-observation.
...the others went to Maikop, where Petrov became director of a state school. Mr Gurdjieff asked him to come to Tiflis when we went there, but he did not come. And when the Bolsheviks again conquered the whole northern Caucasus, he returned to Moscow. Soon, even correspondence with him became impossible.
all quotes are from Hartmann´s - Our Life with Mr. Gurdjieff,
please comment if you have any information on Petrov´s life after returning to Moscow about 1918