Battlecruisers are huge, slow but have tough armor and good firepower. Use them wisely in groups to destroy bases and fight the enemy. 500 hit points and 25 air and ground attack lasers, the battlecruiser can sustain severe punishment. Keep a number of SCVs when you attack to make bunker and turrets for your marines and for your battlecruisers to retreat and repair to. Upgrade the Yamato gun. Use it on enemy towers rather than harmless buildings, use them also for carriers, arbiters, archons, devourers and ultralisks. Do not attack with the battlecruisers alone, use marines and lots of them to support the behemoths.

Use the yamato to destroy a single pylon supporting many photon cannons or cripple spore colonies. Keep the marines under your cruisers and SCVs too.

A few science vessels to matrix the ships can turn the tide of the battle. Use them wisely.

Behemoth Battlecruisers