An intellectual duel is the only kind of Olympic sport in which people of at least 90 years of age can take part. Chess declares checkmate an senile brain disease. Playing chess effectively improves and develops short-term and long-term memory. In the process of this activity, you need to remember the previous moves of the opponent, constantly remember the rules, remember your previous actions and the experience of completed games. Regular performance of such cognitive exercises reduces the likelihood of Alzheimer's disease progressing in modern society.