A chessboar is the type of checkerboard used in the game of chess, and consists of 64 squares (eight rows and eight columns) arranged in two alternating colors (light and dark). The colors are called "black" and "white" (or "light" and "dark"), although the actual colors are usually dark green and buff for boards used in competition, and often natural shades of light and dark woods for home boards. Materials vary widely; while wooden boards are generally used in high-level games, vinyl and cardboard are common for low-level and informal play. Decorative glass and marble boards are available but not usually accepted for sanctioned games.