Chess Board
[ECO code C41]
PHILIDOR DEF. - Jaenisch Counter-Attack
The Locock Gambit
White's KKt5(g5) Knight under RP attack takes the KBP on KB7(f7) to fork Q+KR - a sacrificial gambit.
Black's King removes the knight, forfeits all castling rights and faces an attack from 6.PxP..Kt-Kt5, 7.B-B4+ch..K-K1.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	KtxBP  KxKt
 2. Kt-KB3 P-Q3
 3. P-Q4   Kt-KB3
 4. Kt-Kt5 P-KR3
Example ends: Undo or Jump or Clear