How many rules can we post per week? 
An other one :
A fight is triggered on every zone having PODs from 2, 3 or 4 different players.
For each fight zone, a POD from each player is first destroyed. If PODs from different players are still present on the zone after this destruction, an additional POD from each player still present is destroyed. This phase reproduces itself one more time. For each fight zone, a player loses a maximum of 3 PODs per game round.
=> For each fight zone, a player loses the maximum of PODs per game round.
Ex: 4vs4 => 0vs0 after the round , same for 20vs20, 30v20 => 10vs0 …