White has a possible way to break in. Just one way.
But there is a risk that white might lose if he does that.
but the b on h8 is dead so it really does not cost that much to try.
I have not analysed in depth so you run through an engine if you care.
horsies on a3 and c3, bishop on b2 or c1 and Q on d3 or e2 or f1.
and it looks like q on e2 and ...