Don, I think that is a different kind of scratch. Here is a reference to Dr Jacobson's web page. About 1/3 down the page, you'll see a link called Twenty_One_Plus_Three_CA which opens up an excel spreadsheet. Look at cell C9 and you'll see what I mean. It references cell K26 which appears blank. I suppose he has a formula hidden from view. I just have never seen the formula =Scratch!.