Jack and Ben are playing chess in Ben's house at the Barracks. Ben expresses his regret that Jack is leaving. He affirms that he intends to honor their agreement, but suggests that the Island may decide otherwise. Ben also asserts that if Jack would leave, the day might come when he would want to return again. Jack disagrees and makes an aggressive chess move. Ben immediately retaliates with a defensive "castle" move.
The title refers to two pieces on the chess-board, namely the king and the castle (also known as the rook), and to Ben castling.
The title is also possibly a reference to the game "King of the Castle", more commonly known as "King of the Hill". In the game the king attempts to stay on the hill, while other players attempt to take his spot.
There are three moves shown in the mobisode, Ben playing black and Jack playing white:
Ben pawn at B5 takes Jack's C4 pawn, opening the B file.
Jack's Queen at B2 takes takes Ben's now-exposed bishop at B7, attacking the rook at A8.
Ben protects his rook by castling "queenside" (with the H8 rook), guarding his rook with his castled rook.
The sequence ends with Jack having captured a pawn, bishop, and knight while Ben has captured three pawns.
There are irregularities in the chess game
Both king pieces lie on the incorrect color. Thus in the proper configuration, castling to the left for Ben would have been a kingside castle, not a queenside. The king has not been moved from the correct color, since moving the king would render castling a prohibited move. The board itself is in the correct rotation, with the black square at bottom left (for both players).
Ben's suggestion that, if Jack leaves the Island, he may one day wish to return, foreshadows events revealed in flash-forwards which show Jack's depression and regret after leaving. ("Through the Looking Glass, Part 2")
The production code/mobisode number for this mobisode is 101, even though it was the third mobisode released.
Ben and Jack are playing chess on a black and white board with light and dark pieces. (Games) (Black and white)
Chess: "Castling" is a special move in chess involving the king and a rook of the same color. It consists of moving the king two squares towards a rook, then moving the rook onto the square over which the king crossed. In non-English speaking nations this is known as "Rochieren", "Rochada", "Enroque" or "Roque".