How do i train yolo to find empty intersections in GO game?

[serjou1]

I wanted to make a tool that calculates GO game score (that's why I checked the course), but I have found it very challenging
because of empty intersections detection

I have created 3 classes:

intersection
black stone
white stone

stones are detected easily, but intersections detecting doesn't work
how do I do such thing?

here is how only intersections looks like in CVAT

and here are results

any intersection is not detected in result