Chess Board
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ITALIAN FOUR KNIGHTS' GAME
White's KB move is sometimes played late in error.
Black's KKt (best) removes White's K4(e4)P to threaten 5..KtxKt, starting a combined KP+Kt+Q+B mating attack on White's KB2(f2) so that White must reply 5.KtxKt (or else play the Boden gambit by castling) for any hope of equality. B-Alt.
     White   Black
 1.  P-K4    P-K4
 2.  Kt-KB3  Kt-QB3
 3.  Kt-B3   Kt-B3
 4.  B-B4?!  KtxP! Transp.from Boden G.

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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