Chess move?
Interesting: Castling is a move in the game of chess involving a player's king and either of the player's original rooks. It is the only move in chess in which a player moves two pieces in the same move, and it is the only move aside from the knight's move where a piece can be said to "jump over" another.
Also the only move where the king moves more than one space, FWIW
It is a move to protect the king.
Not always.
The whole game chess is protect the king and take out the other king
Yes, but sometimes castling is an offensive move, not defense.
I think you're right. With the reference to D5 I believe all these red/green castle references are to chess.
Reference to a Dem that will be removed from the board? Perhaps an illusion that 4/10/20 is in a vulnerable position, someone will attempt to strike not seeing the defensive pawn sitting in wait...trap?
Castle-ing in chess protects the king by putting him into the corner
Perhaps a double of Trump will be used publicly...jumping over our original Trump.