I just drone scout, and if I scout a pool thats finishing up or finished before the 2:10 ish mark, I'll 15 pool instead of 15 hatch which makes holding early pools very manageable. You still have to be careful and not lose drones easily but once you know its coming thats easy to do.
If you search for something like 'belial zvz holding a 6 pool team liquid' that should give you a really nice guide to learn from.
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