1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 - Classical. 4...dxe4 - Burn! Black exchanges immediately.
White's plans: Play Nxe4, Nxf6+, Qe2. Recapture and develop. Black's plans: Play ...Be7, ...Nbd7. Simplify to equality.
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