I play Zerg in the HotS beta mainly, and every time I die it's because of plain stupid reasons, I have great economy, 3+ more bases then my opponent, good saturation, etc. I usually like to keep denying their bases, I'm supposed to try to think about denying the third at least. My question is when am I supposed to tech? When do I get other units, such as Ultras or Infestors?
Question: Can someone give me a chart for tech timings? ty :)