White develops his King's Bishop to increase
the support for his KP (effectively still playing the main defence
to Larsen's Opening with a move in hand). Black develops his King's Bishop to
QKt5(b4) to pin White's QKt (halving support for
White's KP).
White Black
1. P-K4 P-QKt3
2. P-Q4 B-Kt2
3. Kt-QB3 P-K3
4. B-Q3 B-Kt5