* KING: tuck it away during the opening, by castling as a rule to get the rook out as well. But in the endgame, the King becomes a strong attacking piece, and can make raids on the opponent's Pawns, and guide your own Pawns through to be Queens. Because of course, with only a few pieces on the board, there is less danger of a middle-game attack, and then the King needn't hide. Then the King becomes like any other piece, and should be moved into the centre of the board to attack or defend as necessary.
"Wisely and slow. They stumble that run fast." -- William Shakespeare, Romeo and Juliet.