Blumenfeld Gambit

The Blumenfeld Gambit is a chess opening characterised by the moves 3...e6 4.Nf3 b5 in the Benoni Defence arising after

1. d4 Nf6

2. c4 c5

3. d5 e6

4. Nf3 b5

or alternatively

1. d4 Nf6

2. c4 e6

3. Nf3 c5

4. d5 b5