Only do this on a no rush 15 above game. First off keep buildingg SCV's until you get nine. With SCV 9 build a supply depot and SCV 10 build a barrack. build however many geysers an SCV for each one then build a Vespane Refinary on each one. build another supply Depot and then get money for 5 more scvs to collect minerals take an scv and build a factory. Get more scvs one vespane probably 3 on each Geyser and get more scvs for minerals and building supply depots. Make sure Somtime you get 2 Armorys for upgrading. after all the scvs you should have around 35 of them. Build until u have 9 starports then get a Sci-Facilty with psyics lab. Upgrade and build BattleCruisers until you max are u get a good amount around. when you get all you will have about 17. MAKE SURE U GET YAMATO. there is no possible way that zerg can beat these not even with a ton of Scrouges. Protoss can maybe stop them with max carriers but only if there upgrade. This works 95% of the time for me so you should win but you have to be a fast builder AND DONT FROGET TO UPGRADE

CreepColony's Opinion: Umm...zerg can easily defeat battlecruisers. Mass hydras, especially with dark swarm, can destroy battlecruisers. Devourers can slaughter them as well. I wouldn't suggest going BC against humans.