C&C: Red Alert Hint - TanyaShift

Here's a tactic of Red Alert 
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TanyaShift
Build a ChronoSphere, build a barracks but don't deploy it, hold the 
training of Tanya before end, and build a MCV. When the ChronoShift is 
ready, Shift your MCV near your enemy's base. Then deploy the barracks 
near it and make it your primary building. Quickly click the Tanya 
you've holded and with that Tanya; DEMOLISH your enemy's base!!!