Chess Board
[ECO code C40]
GRECO DEFENCE
White's KB1(f1) Rook moves to K1(e) and attacks Black's queen on K4(e4) for control of the K-file.
Black's Queen moves to KB5(f5) attacking White's light bishop, but after 7.RxP+ch..KxB, 8.P-Q4..Q-B3, 9. Kt-Kt5+ch..K-Kt3, 10.Q-Q3+ch Black is ruined.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	R-K1   Q-KB5
 2. Kt-KB3 Q-B3
 3. B-B4   Q-KKt3
 4. 0-0    QxKP
 5. BxP ch K-K2
Example ends: Undo or Jump or Clear