Black's KP out to K3(e6) partially blocked his
QB but tripled his QP support and freed his KB
for use. White posts his KKtPawn on KKt3(g3),
enabling him to fianchetto a second
(king's) bishop.
W-Alt.
White Black
1. Kt-KB3 P-Q4
2. P-QKt3 Kt-KB3
3. B-Kt2 P-K3
4. P-Kt3