[ECO code C37 > 39]
The Classical Variation
Black wants to retain his doubled KBP (to avoid danger from a castled f-file rook) and so supports it with his KKtPawn (defended by his Q) - and he may dislodge the Kt by 4..P-Kt5 (for 5..Q-R5+ch). B-Alt.
White Black 1. P-K4 P-K4 2. P-KB4 PxP 3. Kt-KB3 P-KKt4
WHITE to or Undo or Jump or Clear
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