Chess Board
[ECO code C54]
GIUOCO PIANO (Open Line)
The Bird Attack
Black's KKt counter-attacked White's undefended KP and enabled 6..0-0 to defend his vulnerable KBP.
White's Queen's Knight's Pawn to QKt4(b4) attacks Black's dark bishop (like the "Evans Gambit" move, but supported). W-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	P-QKt4
 2. Kt-KB3 Kt-QB3
 3. B-B4   B-B4
 4. P-B3   Kt-B3
Example ends: Undo or Jump or Clear