was experimenting with retro-walls and found some really really good anti-zealot walls.
this is for kespa-era expansion style, with third hatchery at a second natural, so you can get the second main for free with your 6th hatch.
for every wall showed here, hydra den can be replaced with evo chamber and still be zealot-tight, and gas won't be affected at all. you would initially wall with 1 hatch + 1 den (or 1 hatch + 1 evo) at a base, then morph an evo to complete the wall once you see the +1 zealot timing coming at 7:00 with your overlord/lings/scourge