A major limited-time update during Knowhere Siege is Attempt Bonuses. Similar to the Efficiency Bonuses in Cosmic Crucible, a new Attempt Bonus will award points for clearing a room with the fewest possible attempts. Canceling combat during an attack will decrease the Attempt Bonus while also consuming War Energy.
Simply put: the Alliance who eliminates the most squads wins. If two Alliances are tied on squad kills, the Alliance with the highest Attempt Bonus wins. If Alliances are still tied after using Attempt Bonus, the Alliance with the first full clears first wins.
Here is the point system for attacks:
Destroying Bridge: 20,000 Points
Destroying Reactor: 10,000 Points
Destroying All Other Rooms: 5,000 Points
Eliminating a Single Enemy: 200 Points
Eliminating Entire Squad in 1 Attempt: 10 Points
Eliminating Entire Squad in 2 Attempts: 8 Points
Eliminating Entire Squad in 3+ Attempts: 6 Points
First Squad Elimination during a War: 1 Point