Chess Board
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QUEEN'S INDIAN DEFENCE
The Marienbad System

White's KB fianchetto opposed Black's QB+KKt hold on his K4(e4), and enabled 5.0-0 to guard his KR.
Black's QBPawn to QB4(c5) hopes to drag White's QP off-centre and gain promising positions. Origin Rubinstein-Nimzowitsch, Marienbad 1925. B-Alt.
	White	Black
 1.	P-Q4	Kt-KB3
 2.	Kt-KB3	P-QKt3
 3.	P-KKt3	B-Kt2
 4.	B-Kt2	P-B4

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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