have your first overlord hovering outside their base until about 8:00 where you fly it in to see what they are doing. If they are going stargate the easiest way to defend it is to build an extra queen and 1/2 spores at each base. (2-3 if they are going really heavy air.)Once you defend that you can either safely macro on up and take a 4th or punish them with roaches/lings.
This is how I deal with stargate play. I'm not GM but this works in the league i'm at . I hope this has helped
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