posetcay: Extending at K1 before playing E6 should also be correct, it is arguably even better than the shown variation. (I couldn't edit it in myself because I don't know how to upload files where white plays first.)
d4rkm4tter: I added it. For white playing first, you need to cut and paste a white move in the editor.
I added it. For white playing first, you need to cut and paste a white move in the editor.