Castling refers to a special move open to the King and Rooks. If neither the King nor Rook has been moved during the game, the rank separating them is clear of pieces, and during the castling process no space the king will move over or end on is under attack by an opponent piece, the player can move his king two spaces towards the rook, and the rook on the opposite side of the king. For example, assume that the white king on E1 and the white rook on A1 have direct line of sight and have not moved. The white player can, in a single move, move the king two spaces left (to C1) and the rook three spaces right (to D1). The player could also castle kingside, moving the king to G1 and the H1 rook to F1., Play Chess online for free, against the computer, or other people from around the world! Very simple and easy to get started, great graphics, no account required, not even for multiplayer games, just start playing right away!, If you've been given a beta-testing code by CardGames.io please enter it below and click the Enter button. We've created a new CardGames.io app for your tabletphone! All the games from the website, in fullscreen mode, with more characters! Would you like to get the app?.