He was certainly a very good player. Here's his result in the tournament which accompanied the Folkestone Olympiad and where he defeated the eventual winner.
I wonder if he is the same Oscar Blum who is described in this historic event.
https://leninsbody.wordpress.com/2016/0 ... led-train/
Later...A certain Dr. Oscar Blum, a member of the Social Democratic Party, wanted to come on the train. Lenin was against it, suspecting rightly or wrongly that he was a police spy. It was one of the rare occasions when Lenin offered to settle a matter by democratic vote. Accordingly, a vote was taken; eleven voted for Dr. Blum, and fourteen against. He was told that on no account would he be allowed to accompany them on the sealed train.
And who wrote this...Siegfried Bloch, the Swiss socialist, ran up to Lenin, grasped his hand, and said, “I hope to see yon soon back again among us, comrade.” Lenin answered, “H’m, if we come back soon it won’t be a good sign for the revolution.” He settled down in a second-class compartment with Krupskaya, and he was about to take out his note pad when someone told him that Dr. Oscar Blum had calmly taken a seat in the same carriage. Lenin was incensed. He jumped up, hurled himself out of the compartment, found the doctor, and pushed him off the train.
https://archive.org/details/BlumOscarRu ... Koepfe1923
I'm sure there is more to be found out about him.