I am piecing that block right now and for the first time ever, my block is square and exactly the right size with no chopped off points. The secret ........ I'm using Marti Michell's Perfect Patchwork Templates, Set D number 22 and 23. The points are trimmed and her instructions were spot on. I think that this is one block that is difficult without a ruler or templates. Starching and very careful pressing helped but didn't totally solve the problem.