Ключевые слова: activity, background, battle, black, board, challenge, checkerboard, checkers, chessboard, clever, closeup, competition, competitive, desk, education, educational, entertainment, gambling, game, grey, hobby, intellect, intellectual, intelligence, leisure, light, logic, match, object, partnership, pieces, play, playing, skill, smart, sport, square, strategic, strategy, success, table, thinking, white, win,