The Blumenfeld Gambit is a Black gambit in the d4 Nf6 lines that is quite uncommonly played. It is somewhat similar to the Benko Gambit and some lines of the Benoni, but not as popular as either of those black openings. Other alternative lines for Black include:
The lack of popularity for the Blumenfeld is probably because it is regarded as somewhat unsound by opening theory, with White having the edge, especially in the Bg5 declined line, although there is plenty of opportunity for tactical play if White accepts the pawn.
Diagram: Blumenfeld Gambit
Move Orders Reaching the Blumenfeld Gambit
The Blumenfeld Gambit can be reached via a normal move order with 2.c4: 1.d4 Nf6, 2.c4 e6, 3.Nf3 c5, 4. d5 b5!?
The Blumenfeld Gambit can also be reached via Whites 2.Nf3 whereby White delays c4 to avoid certain mainstream black defences (e.g. avoids the Benko Gambit): 1.d4 Nf6, 2.Nf3 e6, 3.c4 c5, 4.d5 b5!?
Blumenfeld Gambit Accepted
The Blumenfeld Gambit accepted proceeds with White first swapping the e6 pawn, and then taking the b5 gambit pawn.
Diagram: Blumenfeld Gambit Accepted
Blumenfeld Gambit Declined
White can also decline the Blumenfeld Gambit. In fact, the declined line is regarded as stronger for White than accepting the gambit. Whites main move is:
Diagram: Blumenfeld Gambit Declined with Bg5
Alternative Sideline with exd5, b5!? and Qb6!?
Instead of an immediate b5 gambit, Black can play first exd5 cxd5, and then only b5!?, when there is no longer a White c4 pawn to capture it. This is no longer a gambit of the b5 pawn, but makes an interesting sideline.
Diagram: Blumenfeld Sideline with b5 and Qb6!?
Reference: BCO 2 page 181, note 3 has the b5!? and Qb6!? sideline.
Alternative Sideline with exd5, b5!? and Qa5!?
Diagram: Blumenfeld Sideline with b5 and Qa5!?
Reference: BCO 2 page 181, note 3 has the b5!? and Qa5!? sideline.
Related Chess Openings Topics
Read more about these related chess openings, strategies, chess puzzles, and other chess topics: