Chess Board
[ECO code C43]
PETROFF DEFENCE - Symmetrical Var.
The Trifunovic Variation
White's QBP to QB4(c4) challenged Black's QP.
Black's dark Bishop on Q3(d6) removes White's knight on K4(e5). Best play continues 8.PxB..Kt-QB3, 9.PxP..QxP with emerging White advantage. B-Alt.
    White  Black	White  Black
 1. P-K4   P-K4	     6.	0-0    0-0
 2. Kt-KB3 Kt-KB3    7.	P-QB4  BxKt
 3. P-Q4   KtxP
 4. B-Q3   P-Q4
 5. KtxP   B-Q3
Example ends: Undo or Jump or Clear