Lesson
White to move. Main line: 1. d4 d5 2. e4 dxe4 3. Nc3 Nf6 4. f3 exf3 5. Nxf3
After 5.Nxf3 White is a clean pawn down with nothing forced — the compensation is structural: the half-open f-file, a lead in development, and standard attacking plans (Bc4/Bd3, Qe1–h4, Ne5) that arrive faster than Black’s queenside play.
Engines give Black the pawn and the better game with accurate defense (...Bf5 or ...g6 setups). Club statistics tell the opposite story — the BDG scores absurdly well below master level, because every natural defensive setup allows a piece storm.
Study it for the attacking patterns even if you never play it: the Ne5/Rxf6 and Bxh7 motifs that arise from this structure appear across all of 1.d4 chess when the f-file opens.
If 4...Bf5 (declining with development): 4... Bf5 5. fxe4 Nxe4 6. Qf3 — White regains the pawn with pressure on b7 and f7 at once.
If 4...e3 (the poisoned return): 4... e3 5. Bxe3 — Black returns the pawn to keep the f-file closed; solid, and exactly what BDG players hope to avoid.