I spoke to idra a bit about this at IEM. I was hoping he would have an answer. All he did was share my misery :s. He told stories of how players like Major would get in unloseable situations vs him and then run 20 vikings into fungal allowing him to win games he had no right to. He had no answer to ghostmech builds or super-lategame Terran.
He went on to destroy Puma 3-0 including a game where Puma went ZERO aggression besides blue flame harass and just macro'd up an enormous army adding in all sorts of units and Idra managed to win by dual-nydusing multiple locations continually for about 2 minutes. By this time Puma had lost just 1 expo and was still looking unstoppable but his army was now spread across all his bases denying nydus and Idra charged and wiped out his main army and won the game.
Afterwards I mentioned that if Puma just walled off with some planetaries, barracks or even bunkers the primarily ultra-composition would never have been able to overwhelm even 1/3 of Puma's army. Dimaga and Idra both readily agreed that the Terran has to make a mistake, in theory, for the Zerg to win this sort of situation. Planetaries are pretty much free mainly minerals and he was floating quite few thousand so he could have defended alot better.
So yeah, I totally agree you shouldn't let the game go past a certain point. This is because:
1) You should have a superior economy as zerg and whilst your units suck individually, your production makes them all-powerful.
2) "If you aren't attacking, you're probably losing" -QXC ... I think there's so much that can go on in this game and that if there is little interaction between the players forces then leads can be lost, losses can be avoided and an advantageous battle at max can quickly turn sour.
3) "Zerg units shit" - Dimaga = Zerg units are bad. They get worse as your opponent gets better shit.
Basically if you're ever just sitting there letting a T or P take bases you're playing zerg wrong. You need to use your units constantly and trade with your opponent. Does this mean attack an entrenched position repeatedly? No. But make use of your economy to force your opponent into expanding aggressively and take the good engages that present themselves. This is hard. It's really hard to guage if an opponent is just gunna sit there or attack.
1) Count production + scout expansions THE MOMENT they start building
2) Learn ways to push your economy harder
3) Learn ways to clean up his pressures and pushes faster and more efficiently
4) Learn to not overreact to "sharking" around the map with his army to force you into building units you didn't want nor need
Sounds easier in point form eh...
Honestly though the best advice I can give is follow stephano's stream religously. He almost never loses from an economic advantage. What I learn from it every day:
Sure tech switches are great. But each wave needs to be doing significant damage otherwise you're just hoping your opponent screws up. The answer rarely lies in composition but usually in positioning and economy.
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