Chess Board
[ECO code A30] Move Move Move Move Here Move Here
ENGLISH OPENING - Symmetrical Def.
(The) Ultra Symmetrical Defence (alt. route)

White deployed his QKt to resume control of Q5(d5).
Black also develops his Queen's Knight, keeping symmetry. "Main" order (below) was set in 1960s ECO coding although this route is seen more.
     White   Black
 1.  P-QB4   P-QB4
 2.  Kt-KB3  Kt-KB3
 3.  P-KKt3  P-KKt3
 4.  B-Kt2   B-Kt2
 5.  Kt-B3   Kt-B3  Main 5WB,2WB 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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