The king of no castling

In the body of chess rules, castling is a clumsy protuberance. Once per game, you get to move king and rook at the same time, with a bewildering list of exceptions. (One dreads having to broach these gotchas with a novice opponent who has castled improperly.) Despite its convoluted logic, castling is nothing more than a convenience, and the game could function perfectly well without it.

Five hundred years ago, the rules of chess were still evolving, with significant regional variations. The ‘king’s leap’, a precursor of modern castling, permitted the king to make one move as a knight jump (perhaps from e1 to g2), while in other forms it could step two squares any which way (so, for example, e1 to g3 was also on the menu). If the latter sounds wacky, at least it is congruous with the way in which pawns can jump two squares on their first move.