[pyjarrett]

Fantastic! You should be very proud.

Took a while to get used to it, but I was very satisfied to clear a few lines.

I was curious what effect it would have to change or add to the concept of "row" to be not horizontal, but instead a "strip of contiguous triangles from the bottom to one of the sides." I might also try instead of a flat bottom, one shaped like an inverted triangle.