Computer system and game system

A computer system comprising:

• at least one processor or circuit programmed to:
• control execution of an electronic video game in which a player character and an opponent character have a real-time match;
• detect occurrence of an action exchange in which one of the player character and the opponent character performs a first action and another one of the player character and the opponent character performs a second action to mutually exchange the actions, the first action being generated based on a signal from a first player terminal, and the second action being generated based on a signal from a second player terminal;
• and
• control a display to display a recommended candidate action that is executable by the player character and recommended to be performed after an end of an own stiff time to a player controlling the player character, based on the own stiff time related to the action performed by the player character, upon detection of the action exchange, the own stiff time being a predetermined length of time during which operations for controlling the player character that are input on one of the first player terminal or the second player terminal are not executed in the electronic video game.