Chess Board
[ECO code C40]
GRECO DEFENCE
Side Variation
Black's king in check to Q1(d8) forfeited all castling.
White's KB3(f3) Knight removes the Black KP on K5(e5) for advantage by 6..Q-KB4, 7.Q-K2..KKt-K2, 8.B-R5..Kt-Kt3, 9.BxKt..PxKt, 10.R-K1 (or if 6..QxKt?? then 7.R-K1 to mate or take Black's queen).
    White  Black	White  Black
 1. P-K4   P-K4	     5. BxP ch K-Q1??
 2. Kt-KB3 Q-B3      6.	KtxP
 3. B-B4   Q-KKt3
 4. 0-0    QxKP
Example ends: Undo or Jump or Clear