Formation density does greatly affect cav vs inf battles i find.
I just fought a battle where there were a couple of tough pezhetairoi pinned by weaker pontic phalangai. I charged the back of each pezherairoi with kappadocian and leuce epos cavarly (4 cav vs 2 inf). Then halfway during their charge the pikes faced the cav and started hurting the cav badly, at this point, I ordered the phalangai to break formation and charge the enemy pikes. With 3 units pushing on each pike, they all broke formation and no longer pointed their spears at my cav and were cut down much quicker.
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