Defense evolution

Starting round 160, the attack/defense system evolves.
Every time a player receives an attack, the efficiency of the next received attack will be reduced by 10%.
On every update, the efficiency of the next received attack will be incremented by 1%, until it reaches its maximum

You can view this parameter at any time, as well as its value history on every received attack, in the 'defense' page of your planet.
Those parameters are experimental and might evolve based on their results and your feedback.
Have a good game, best wishes for 2016.