The opening is named after the Russian chess master Benjamin Blumenfeld, and was later played by World Chess ChampionAlexander Alekhine.
The opening position can also be reached via Benko Gambit (1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nf3 e6). Possible continuations are 5.dxe6 (Kan-Goldenov, 1946), 5.Bg5 (Vaganian-K. Grigorian, 1971), 5.e4, or 5.a4 (Rubinstein-Spielmann, 1922).[1]
Here are some games from recent tournaments. I've never heard of this gambit before. So if its new to you, its new to me as well.