Just saw about the yolk one in the other thread. Fingers crossed for you! Happy to hear about the other chicks hatched well.
Still no pips or movement on the 4. Decided to candle. One had movement, the other three look wrong, like they quit the last couple days.
I took a screw and carefully drilled a tiny peep hole in the top to look down the air cell.
The membrane had a pip through it but I couldn't see where the beak was underneath. Since it seems most likely not to make it I helped it. Don't have good odds but we'll see. I broke off some at the air cell, wetted the membrane, pulled open the membrane a little bit to where the beak is at.
It has serious crooked beak. Probably why it wasn't hatching. I misted a bit of water to up the humidity from opening. I'll keep an eye on it though.