Chess Board
[ECO code C42] Do not scroll the screen..! Move Move Move Here
PETROFF'S DEFENCE
Russian Three Knights Variation
White developed his king's bishop to QB4(c4) to deter ..P-Q4 again, target the Black king's weak (least defended) KB2(f7) pawn and enable castling.
Black castles, bringing his King's Rook into play, and improves his KBP defence in the process.
	White	Black
 1.	P-K4	P-K4
 2.	Kt-KB3	Kt-KB3
 3.	Kt-B3	B-Kt5
 4.	B-B4	0-0
WHITE 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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