Originally Posted by
RedGarnet222
In the case of a y seam, you are in essence just turning the fabric at the sharp point and sewing down the other side. Stop with your needle down at the Y point, turn your work, align the edges together, sew down the other seam. It is kind of like turning a street corner.
Kaye Wood (no relation) has a tutorial on doing it this way. I don't remember if she pressed the first seam open or not, but I would think that would be the thing to do.
I learned how to make tumbling blocks without "Y" seams. So much more fun.