3729391874 (30) Understand? * * * * 1 king, 1 QUEEN * 1 queen * 2 rooks * 2 bishops * 2 knights * 8 pawns
Each piece moves in a different way. * The rook moves any number of vacant squares forwards, backwards, left, or right. It is also involved in a special move called castling, along with the king. * The bishop moves any number of vacant squares diagonally. Consequently, a bishop stays on squares of the same color throughout a game. The two bishops each player starts with move on squares of opposite colors. * The queen moves any number of vacant squares in any direction forwards, backwards, left, right, or diagonally. * The king moves only one vacant square in any direction forwards, backwards, left, right, or diagonally. It can also castle in conjunction with a rook. * The knight moves to a vacant square in an "L"-shape two spaces forwards, backwards, left, or right, then one space perpendicular. The knight jumps over any intervening piece(s) when moving. * The pawn can only move forward one space or, optionally, two spaces when on its starting square, away from the player. When there is an enemy piece one square diagonally ahead from the pawn, either left or right, then the pawn may capture that piece. A pawn can perform a special type of capture of an enemy pawn called en passant. If the pawn reaches a back rank of the opposite player, it undergoes promotion to the player's choice of a rook, bishop, queen, or knight (Just & Burg 2003:13–16). * Fairy chess pieces usually fall into one of three classes, although some are hybrid pieces. Some types of pieces, called compound pieces, are created by combining the movement powers of two or more different pieces. * A specialized solving program, WinChloe, recognizes more than 1200 different fairy pieces.
* Movement type * Leapers * An (m,n)-leaper is a piece that moves by a fixed type of vector between its start square and its arrival square. One of the coordinates of the vector 'start square – arrival square' must have an absolute value equal to m and the other one an absolute value equal to n. A leaper moves in the same way whether or not it captures, the taken unit being on the arrival square. For instance, the knight is the (1,2)-leaper. * The leaper's move cannot be blocked; it "leaps" over any intervening pieces, like the knight in standard chess. * In shatranj, a forerunner to chess, the pieces later replaced by the bishop and queen were also leapers: the alfil was a (2,2)-leaper (moving exactly two squares diagonally in any direction), and the fers a (1,1)-leaper (moving exactly one square diagonally in any direction). * Some pieces can be described as combined leapers, i.e. as pieces having the movement capabilities of multiple leapers. The king in orthodox chess (ignoring check restrictions) is an example of a combination of a (1,1)-leaper and a (1,0)-leaper. * Leapers are not able to create pins, although they are often effective forking pieces. One additional property is that the check of a leaper cannot be parried by interposing. * All orthodox chessmen except the pawn are either leapers or riders, although the rook does 'hop' when it castles. * The Wazir is a (1,0)-leaper (an "orthogonal" one-square leaper); the Fers is a (1,1)-leaper (a "diagonal" one-square leaper). Both are used in Muslim versions of chess. The king of standard chess combines the two. * The Dabbaba is a (2,0)-leaper; the Alfil is a (2,2)-leaper; the knight is a (1,2)-leaper. The Alibaba combines the Dabbaba and Alfil; while the Squirrel can move to any square 2 units away. The Arabic word dabbāba formerly meant a type of medieval siege engine, and nowadays means "army tank". * The 'level-3' leapers are the Threeleaper, a (3,0)-leaper; the Tripper, a (3,3)-leaper; the Camel, a (1,3)-leaper; and the Zebra, a