Chess Board
[ECO code C25]
TRANSPOSITION
VIENNA GAME to PETROFF DEF. (Russian 3Kts V.)
White developed his KKt to KB3(f3) to prevent 3..Q-R5, threaten Black's KP and support 4.P-Q4.
Black adopts the Russian Three Knights line of Petroff's Defence by developing his King's Knight to KB3(f6) to counterattack White's KP. B-Alt.
    White  Black    Transp.White Black
 1. P-K4   P-K4		  (1.)
 2. Kt-QB3 B-Kt5    (2.	Kt-KB3 Kt-KB3)
 3. Kt-B3  Kt-KB3   (3.	Kt-B3  B-Kt5 )
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