Chess Board
[ECO code C41]
PHILIDOR'S DEFENCE
Side Variation
Black's king was forced to exchange queens and forfeit castling rights, and his KP was left en prise.
White's KB3(f3) Knight captures the KP on K5(e5), attacks the bishop and threatens a KtxKBP+ch fork, necessitating 6..B-K3 with clear White advantage.
    White  Black	White  Black
 1. P-K4   P-K4	     5. QxQ ch KxQ fcd
 2. Kt-KB3 P-Q3	     6.	KtxP
 3. P-Q4   B-Kt5?!
 4. PxP!   PxP??
Example ends: Undo or Jump or Clear