×In this room you need to remember that goblin wants to be on the same diagonal as Beethro.

It(goblin) will make a lot of diagonal moves while following the path you need to carve.

As an example of what path needs to look like, here's a tiny part of it(the pressure plate on image is one at 29,30):

×(and by one obvious flaw I mean that you broke some walls to the west of pressure plate at 29,30 - don't do that)

×I carved a small alcove at 34,28-34,29 where I lured goblin to keep it at the beginning of the path