Ключевые слова: activity, battle, board, brain, buttons, challenge, chess, chessboard, classroom, clock, competition, concentration, conflict, contemplation, contest, countdown, deadline, decisions, education, enjoy, entertainment, event, game, hobbies, intellectual, intelligence, learning, leisure, lesson, logic, loss, lost, male, man, match, piece, player, playing, pressure, professional, pushing, sharpened, skill, sport, strategy, switches, time, timer, tournament, winning,