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