We have already seen how important it is to keep our king safe if we want to avoid being checkmated early in the game. Castling is a special move involving two pieces, the King and one of the rooks, designed to get the king out of the centre and towards a corner where he will normall be safer. Look at the diagrammed position.

White's king and rook are on their starting squares. In this position, White may castle. Click on White's king to see this happen.