White develops his King's Bishop, recoups the
doubled QBP on QB4(c4) and enables castling. Black sets his KPawn on K3(e6),
frees his KB and shields his weak KB2(f7), maintaining
equality.
White Black
1. P-Q4 P-Q4
2. P-QB4 PxP
3. Kt-KB3 P-QR3
4. P-K3 B-Kt5
5. BxP P-K3