Now, each of the pieces we have considered so far – pawns, knights, bishops and rooks – have peculiarities which make certain positions more or less suitable for them to operate. Kings and Queens move in each direction with equal ease, and so have no such rules – although Queens do like a bit of space to get into their stride.
Their flexibility gives them value, and because they are so valuable they are often the subject of tricks and traps in the opening. Here’s some illustrations: forgive me using my own but they don’t put many cheapos in master game collections.