A few colossus for anti small.
Tempests and archons for splash
Stack anti armor like immortal and tempest and upgrade anti big damage
Terran units: tanks and Thor.
Keep 40+ zealots at all times
Upgrade recursive self improvement, most wild card options like bigger unit size , upgrade units when offered bonus 10% damage.
Battlecruiser upgrade : slow, guard, barrier, everything defensive.
Stack spells so you can spam them when you hit lane 47
Never fuse units
Works pretty hands free, zealots never need to engage until Lane 47 or 48 when a screen full of zerglings ended the game for me.
Would love some forum where people discuss this more, maybe with experiments.