Answer and Explanation:
Chess is definitely a game to be played by two, and it is necessary that each participant has his own strategy and does not know the other's strategy, thus making the game exciting and unpredictable. It is impossible to play chess alone, so if an individual has managed to create two separate entities from himself and play a game of chess, that individual is not alone, but has managed to establish an external partner, who has fulfilled the requirements to play that game.