Intellivision's Utopia has been reverse engineered by Intvnut a.k.a. Joe Zbiciak. you can check out Joe's Space Patrol website or his original site. Here are the highlights, in case you don't want to look through all of the code. This is a great source of information in helping you to master this game:
Do protect a 1 unit radius against rebels
Will protect parked ships that have the same owner as the fort. Radius of 1 card.
Will protect both players ships when they're under active control. Radius of 1 card.
Do not otherwise contribute to your score
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