Chess Board
[ECO code C74]
RUY LOPEZ - Steinitz Def. Deferred
Kopayev Variation
Black moves his Bishop from KB4(f5) to Q6(d3), attacking White's king's-side rook.
White's Rook under attack moves to K1(e1) on the half-open king's (e-)file, tending towards advantage.
    White  Black	White  Black
 1. P-K4   P-K4	     6. PxP    BxP
 2. Kt-KB3 Kt-QB3    7.	0-0    B-Q6
 3. B-Kt5  P-QR3     8.	R-K1
 4. B-R4   P-Q3
 5. P-B3   P-B4!?
Example ends: Undo or Jump or Clear