Blumenfeld Countergambit

An entry in the Encyclopedia of Chess Openings (ECO E10), reached after 8 half-moves: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5.

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5.Bg5 2 lines
- E10 Duz-Khotimirsky Variation
- E10 Spielmann Variation

About this opening

Blumenfeld Countergambit is an opening in the Encyclopedia of Chess Openings, classified under code E10. ECO group E (E00–E99) covers Indian defences against 1.d4, covering the Nimzo-Indian, Queen's Indian, King's Indian and Catalan systems. This particular variation is reached after 8 half-moves from the starting position, with the move sequence 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5.

The opening sequence in prose form: 1.d4 Nf6, 2.c4 e6, 3.Nf3 c5, 4.d5 b5. From this position exactly one named continuation is recorded in the encyclopaedia.