Chess Board
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RUY LOPEZ
The Alapin Defence

White's KB attacked and half-pinned Black's QKt.
Black adopts the rare Alapin Defence (better is ..P-QR3,..B-Kt5), developing his King's Bishop to QKt5(b4) to delay a White P-Q4 (by pinning the QP+K) despite the threat of 4.BxKt..QPxP, 5.KtxP, and enables castling. B-Alt.
	White	Black
 1.	P-K4	P-K4
 2.	Kt-KB3	Kt-QB3
 3.	B-Kt5	B-Kt5

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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