I am playing the campaign now and found a unfortunate mistake in the programming.
When a piece was chaing me i was trying to use the 3 square rule to my advantage. It then let him move again, so i wanted to move again too. It said i wasn't allowed to move because of the 4 square rule! This means the chaser always wins, which is terrible for the gameplay. 3 or 4 moves makes a huge difference since it decided wheater the attacker wins or loses.