User blog comment:Cloudy176/Yet another blog post of Turing machines/@comment-5150073-20130410161417/@comment-1605058-20130411180730

It halts on second-from-left symbol (depending on halt condition it is 1 or 2).

http://www.drb.insel.de/~heiner/BB/simLig33_b-a.html << shortened simulation of machine