Chess Board
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LOPEZ FOUR KNIGHTS GAME
Double Ruy Lopez Opening
Black's KB (like White's) set a half-pin on a QKt.
White castles early, placing his King in safety so that his QKt will not be pinned when his QP moves out, and bringing his King's Rook into play. W-Alt.
     White   Black
 1.  P-K4    P-K4
 2.  Kt-KB3  Kt-QB3
 3.  Kt-B3   Kt-B3
 4.  B-Kt5   B-Kt5
 5.  0-0	    Transp.from Alap.D.
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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