White pushes his King's Knight's
Pawn out a square to attack/dislodge Black's queen and also
enable a king's bishop fianchetto. Black's Queen under threat retreats to
Kt4(g5). Counter 4..Q-KKt5, 5..Q-KB6 by
5.B-Kt2.
White Black
1. P-K4 P-K4
2. Kt-K2 Q-R5
3. QKt-B3 Kt-QB3
4. P-KKt3 Q-Kt4