History of chess were finalized in the early 19th century. The modern move of the queen may have started as an extension of its older ability to once move two squares with jump, diagonally or straight. Marilyn Yalom says that the new move of the queen started in Spain: see history of the queen. In some areas (e.g. Russia), the queen could also move like a knight. A poem "Caïssa" published in 1527 led to the chess rook being often renamed as "castle", and the modern shape of the rook chess piece; see Vida's poem for more information. An Italian player, Gioacchino Greco,
Chess piece outset. Some small magnetic sets, designed to be compact and/or for travel, have pieces more like those used in shogi and xiangqi – each piece being a similar flat token, with a symbol printed on it to identify the piece type. On computers, chess pieces are often 2D symbols on a 2D board, although some programs have 3D graphics engines with more traditional designs of chess pieces. Unicode contains symbols for chess pieces in both white and black. The value assigned to a piece attempts to represent the potential strength of the piece in the game. As the game develops,