1. Communication technology: In 2023, communication technology will be more developed. Modern Internet and smart phones enable people to communicate anytime and anywhere, but Garrison's communication technology in the1940s was relatively limited, and communication needed more time and resources.

2. Artificial intelligence: In 2023, artificial intelligence made breakthroughs in many fields, including board games, while Garrison had relatively limited computer players in the 1940s and could not compete with modern technology.