Pacewar is a relatively simple fighting game between two teams of space
ships. A team wins the round when all ships of the other team are
destroyed, and a certain number of victories more than the other player
is needed to win the game. But there's a catch: as a team gets closer
to winning, it loses ships, so you need to be better than the other
team to succeed.

Human players take over one ship at a time from their respective teams.
If a human player's ship is destroyed, that human player takes over an
AI ship from their team randomly. This ensures that the human players
are always in the game.