[ECO code D46]
The Bogoljubow Variation
Black rejects the popular Meran (6..PxP) and develops his King's Bishop to K2(e7) to support his KKt, and also enables castling. B-Alt.
White Black White Black 1. P-Q4 P-Q4 6. B-Q3 B-K2 2. P-QB4 P-K3 3. Kt-QB3 Kt-KB3 4. Kt-B3 P-B3 5. P-K3 QKt-Q2
Example ends: Undo or Jump or Clear