Chess Board
[ECO code C42] Move Move Move Here Move Here
PETROFF'S DEFENCE
Russian (aka. Vienna) 3Kts. Variation
White's QKt defended his counter-attacked KP.
Black develops his King's Bishop to QKt5(b4) to half-pin White's QKt+QP (compare with the Three Knights), supporting a resumed ..P-Q4 and enabling castling. The alternative 3..Kt-QB3 transposes into the less aggressive Four Knights Game. B-Alt.
     White   Black
 1.  P-K4    P-K4
 2.  Kt-KB3  Kt-KB3
 3.  Kt-B3   B-Kt5  Transp.from Vienna
WHITE to Move or Undo or Jump or Clear
 
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