Chess Board
[ECO code C40]
GRECO DEFENCE
Black's KKt3(g6) queen removed White's KKtPawn, attacked his king's rook and prevented him castling.
White's Bishop on QB4(c4) (best) captures Black's pawn on KB7(f7), giving check to gain advantage by 5..KxB, 6.R-Kt1..Q-R6, 7.Kt-Kt5+ch or by 5..K-K2 (or Q1), 6.R-Kt1..Q-R6, 7.R-Kt3.
    White  Black	White  Black
 1. P-K4   P-K4	     5.	BxP ch
 2. Kt-KB3 Q-B3
 3. B-B4   Q-KKt3
 4. P-Q3   QxKtP
Example ends: Undo or Jump or Clear