In the GSL code S ro16 group b matches today Symbol dealt with this attack by using overlord ventral sacs to negate the force fields. As I am not a zerg I don't know how viable this is normaly but i thought this was an elegant solution.
Only problem is that ovie drop is actually very expensive. If we want ovie drop done by the time a 9:00 push moves out, we need to start research at 7:00, or start lair at ~5:30, which is before stephano even starts his 2 gases.
To scout it, usually I start a 6:30 warren when I see no gas, 6:45 warren+7:00 evo when I see one gas, 7:00 warren+evo when I see 2 gas. Fits pretty well for me.
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