Chess Board
[ECO code C01] Move Move Move Here
FRENCH DEFENCE
"Symmetrical" Exchange Var. (alt. route)

White developed his KB to Q3(d3) and enabled 0-0.
Black (like White) also develops his King's Bishop to Q3(d6) and enables castling away from the open king's (-e) file, in case of his opponent's Kt-K5.
     White   Black
 1.  P-K4    P-K3
 2.  P-Q4    P-Q4
 3.  PxP     PxP
 4.  Kt-KB3  Kt-KB3 Main 5W,4W route
 5.  B-Q3    B-Q3   Main 5WB,4WB route

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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