Don't attack tank defended positions without very superior army. Abuse his tanks immobility by ambushing him and over expanding him.
Micro your army. Zealots in front, Colossi fire and save your stalkers that can quickly flee when it's over.
Never let the Xel'Naga to the ennemy
After Colossi, tech to Storm on 3 bases to avoid vikings
When you scout tank, marauders and thors, the counter is Immortals.
A couple of quick follow up questions...
In this example and other PvT should I wait outside his ramp when he is turtling (outside the range of his tanks) and try to force him to engage?
Microing the zelots... Is it best to double click the zelots and move them in first then manually send in the rest or do you do some other trick to make it easier. This is something I struggle with as zelots are bloody slow.. should i have them on 2 seperate hot keys? I have always used a single hotkey for my army which makes microing more difficult.
All the rest is excelent advise and am surprised how obvious it all its. Thank you for you effort.
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