Official rule text
48.3 When playing with three or four players, a player’s initiative is c A player cannot gain control of a planet they already determined only by their lowest-numbered strategy card. control. RELATED TOPICS: Action Phase, Strategy Card, Status Phase d If there was a combat, and all units belonging to both
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Source: Twilight Imperium: Fourth Edition - Living Rules Reference: Prophecy of Kings
Expansion: Prophecy of Kings
Version: 2.0
Reference: Rule 48.3