The Queen is the most powerful piece. She can move any number of squares in
any direction — horizontal, vertical, or diagonal — if her path is not
blocked. She can reach any of the squares with dots in this diagram.
The Rook is the next most powerful piece. The Rook can move any number of squares vertically or horizontally if its path is not blocked.
The Bishop can move any number of squares diagonally if its path is not blocked. Note that this Bishop starts on a light square and can reach only other light squares. At the beginning of the game, you have one "dark-square" Bishop and one "light-square" Bishop.
The Knight's move is special. It hops directly from its old square to its new square. The Knight can jump over other pieces between its old and new squares. Think of the Knight's move as an "L." It moves two squares horizontally or vertically and then makes a right-angle turn for one more square. The Knight always lands on a square opposite in color from its old square.
The King is the most important piece. When he is trapped, his whole army loses. The King can move one square in any direction — for example, to any of the squares with dots in this diagram. (An exception is castling, which is explained later.) The King may never move into check — that is, onto a square attacked by an opponent's piece.
The Pawn moves straight ahead (never backward), but it captures diagonally. It moves one square at a time, but on its first move it has the option of moving forward one or two squares. In the diagram, the squares with dots indicate possible destinations for the pawns. The White pawn is on its original square, so it may move ahead either one or two squares. The Black pawn has already moved, so it may move ahead only one square at a time. The squares on which these pawns may capture are indicated by an X. If a pawn advances all the way to the opposite end of the board, it is immediately "promoted" to another piece, usually a Queen. It may not remain a pawn or become a King. Therefore, it is possible for each player to have more than one Queen or more than two Rooks, Bishops, or Knights on the board at the same time.