The core rules have had some minor revisions. Spear and Pike troops can now take dice away from the enemy’s melee total rather than adding to their own. John Hills suggested that it might be better since a unit does not fight better just because it carries a long pole weapon. Rather, it should disadvantage an enemy formation armed with weapons with a lesser reach.
Spears cause a -1 penalty to all mounted attackers.
Pikes cause a -1 penalty to all non-pike infantry attackers and -2 penalty to all mounted attackers.
These penalties assume that the formation is being attacked solely from the front.