Blumenfeld Countergambit (E10–E19)

Opening: 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5. A dynamic Benoni–Benko hybrid: pawn sacrifice for activity and queenside pressure.

Themes: Benko-style file pressure, Benoni pawn chain (...e6–d5–c5), Grünfeld dark‑square control.

Key Variations

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