Chess Board
[ECO code C42] Do not scroll the screen..! Move Move Move Here
PETROFF'S DEFENCE
Russian Three Knights Variation
Black's aggressive KB to QKt5(b4) half-pinned White's QKt+QP, enabling ..0-0 and a resumed ..P-Q4.
White developing his King's Bishop to QB4(c4) deters ..P-Q4 again, targets the Black king's field's weakest pawn on KB7(f7) and enables 0-0. W-Alt.
	White	Black
 1.	P-K4	P-K4
 2.	Kt-KB3	Kt-KB3
 3.	Kt-B3	B-Kt5
 4.	B-B4
BLACK to Move or Undo or Jump or Clear
 
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When castling always touch the king first
Under FIDE laws of chess, if a player deliberately touches a rook and then his king, he is not allowed to castle on that side on that move but must still move the rook if legally possible.

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