Also, on Immortal and even moreso on Deity difficulty you cannot use the same strategy on every map. Your beginning strategy needs to be determined by the map and your situation. If you have a close and typically aggressive neighbor (like Japan, Rome, France, etc.) then you need to adjust your strategy accordingly. That being said you can still usually kick out a few defensive units and also manage the HS-PT combo, particularly on Immortal. On Deity the HS will sometimes go in the 80's, so it is possible to miss that in some games.