For instance, one bitboard could keep track of all empty squares, another could keep track of all White rooks, another for all White pawns, another for all Black bishops, and so on.

• 例如，一个位棋盘用来跟踪棋盘上所有的空格，而另外一个位棋盘跟踪棋盘上所有的白车，再有一个位棋盘跟踪棋盘上所有的白卒，还有一个可以跟踪棋盘上所有的黑象，等等。