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The '''Chessboard''' is the playing ground for the [[Chess Game|game of chess]] and its up to 16 white and black [[Pieces|pieces]] each. It consists of [https://en.wikipedia.org/wiki/64_%28number%29 64] [[Squares|squares]], eight rows, called [[Ranks|ranks]], times eight columns, called [[Files|files]]. The squares are alternating dichromatic (light or white, and dark or black squares) on ranks as well on files. Ranks are labeled from '1' to '8', the files from 'A' to 'H' (or with lower case letters 'a' to 'h'), so that each square can be uniquely addressed via concatenated file- and rank labels. The lower left square with the "Address" 'a1' is dark. The [[Diagonals|diagonals]] are the north-east directed, distinguished from the [[Anti-Diagonals|anti-diagonals]] in north-east west directions.