Chess Board
[ECO code C42]
PETROFF'S DEFENCE
Kaufmann Variation
White's KB1(f1) Rook moves to K1(e1) defending his QP by doubling the attack on Black's centre Kt.
Black's K5(e4) Knight returns to KB3(f6), losing a tempo but keeping equality (White having an IQP).
    White  Black	White  Black
 1. P-K4   P-K4	     6.	P-Q4   0-0
 2. Kt-KB3 Kt-KB3    7.	B-Q3   P-Q4
 3. KtxP   P-Q3	     8.	0-0    Kt-QB3
 4. Kt-KB3 KtxP	     9.	PxP    QxP
 5. P-B4   B-K2	    10.	R-K1   Kt-KB3
Example ends: Undo or Jump or Clear