In professional games, the furigoma is done on the behalf of the higher-ranked player/champion by the timekeeper who kneels by the side of the higher-ranked player and tosses the pawn pieces onto a silk cloth. In friendly amateur games, a player will ask the opponent to toss the pawns out of politeness. Otherwise, the person who tosses the pawns can be determined by Rock–paper–scissors. After the piece toss "furigoma," the game proceeds. If multiple games are played, then players alternate turns for who goes first in subsequent games. (The terms "Black" and "White" are used to differentiate sides although there is no difference in the color of the pieces.) For each turn, a player may either move a piece that is currently on the board (and potentially promote it, capture an opposing piece, or both) or else drop a piece that has been previously captured onto a square of the board. These options are explained below. The usual goal of a game is for one player to checkmate the other player's king, winning the game. Most shogi pieces can move only to an adjacent square. A few may move across the board, and one jumps over intervening pieces. The lance, bishop, and rook are "ranging" pieces: They can move any number of squares along a straight line limited only by intervening pieces and the edge of the board. If an opposing piece intervenes, it may be captured by removing it from the board and replacing it with the moving piece. If a friendly piece intervenes, the moving piece must stop short of that square; if the friendly piece is adjacent, the moving piece may not move in that direction at all. A king (玉/王) moves one square in any direction, orthogonal or diagonal. A rook (飛) moves any number of squares in an orthogonal direction. A bishop (角) moves any number of squares in a diagonal direction. Because they cannot move orthogonally, the players' unpromoted bishops can reach only half the squares of the board, unless one is captured and then dropped. A gold general (金) moves one square orthogonally, or one square diagonally forward, giving it six possible destinations. It cannot move diagonally backwards. A silver general (銀) moves one square diagonally, or one square straight forward, giving it five possible destinations. Because an unpromoted silver can retreat more easily than a promoted one, it is common to leave a silver unpromoted at the far side of the board.