Chess Board
[ECO code C42] Karpov-Kasparov, W.Ch.M. 1985
PETROFF'S DEFENCE
Jaenisch Variation
Black's Q4(d5) pawn took the QB5(c4) pawn (a Queen's Gambit Acc. equiv.) to threaten ..PxB.
White's Q3(d3) Bishop trades P-for-P and controls Q5(d5). Equally met in the QGA (but in 9 moves).
    White  Black     6.	B-Q3   B-K2
 1. P-K4   P-K4	     7.	0-0    Kt-QB3
 2. Kt-KB3 Kt-KB3    8.	P-B4   Kt-B3
 3. KtxP   P-Q3	     9.	Kt-B3  0-0
 4. Kt-KB3 KtxP	    10.	P-KR3  PxP
 5. P-Q4   P-Q4	    11.	BxP   >Transp.
BLACK to Continue or Undo or Jump or Clear