Chess Board
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TWO KNIGHTS DEFENCE
Centre-Play Variation

White's QP, with Kt+Q support, attacked Black's KP inviting open play that can enable the Max Lange.
Black's King's Pawn removes the QP on Q5(d4) and, supported in turn by his own Kt, invites an exchange capture. Often arises via the Scotch.
     White  Black
 1.  P-K4   P-K4
 2.  Kt-KB3 Kt-QB3
 3.  B-B4   Kt-B3 Transp.from Scot-Gam
 4.  P-Q4   PxP   Transp.from Urusov.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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