[ECO code D31]
Main line (alt. route)
Black usually deploys his King's Knight to KB3(f6) to quadruple support for his QP and deter White's ongoing P-K4 plan, although he invites a 5.B-Kt5 pin. "Main" to the position until '60s ECO coding. B-Alt.
White Black 1. P-Q4 P-Q4 2. P-QB4 P-K3 3. Kt-QB3 P-QB3 4. Kt-B3 Kt-B3 Main 4B,3B route
WHITE to or Undo or Jump or Clear
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