Chess Board
[ECO code A47]
QUEEN'S INDIAN DEFENCE
Marienbad System
White's QB4(c4) Pawn removes the QP on Q5(d5).
Black's KB3(f6) Knight exchanges, taking White's new restored QP and set for 13.KtxKt..QxKt equality.
    White  Black	White  Black
 1. P-Q4   Kt-KB3    7.	KxB    P-Kt3
 2. Kt-KB3 P-QKt3    8.	P-QB4  Q-B1
 3. P-KKt3 B-Kt2     9.	P-Kt3  B-Kt2
 4. B-Kt2  P-B4	    10.	Kt-QB3 Q-Kt2 ch
 5. 0-0    PxP	    11.	P-B3   P-Q4
 6. KtxP   BxB	    12.	PxP    KtxP
Example ends: Undo or Jump or Clear