Since I removed my shop the basement and portals are gone too.
But, in order for you to still have a look at the 'BoundChess' project, I moved the portal.
So go to where my shop was and you will see this:
In the back you see the Tiger-portal-street. We made this street so people can set a personal portal directly to the Therka Market (from their home). That way you can travel in a fast way to the market/home. But other players are now also able to see all the places where people are building their houses.
I placed a portal directly to the chess board:
So have a look while you still can !