Damn I overlooked your post, that was exactly what I need.
Yes I was puzzled also on the Calc for DDA.
I'll send you a link to my spreadsheet, maybe it will help explaining.
I believe because his Index was -.44 it rounded down.
I wasn't sure if calculations should always round to nearest or round up or down.
6.2 indicated to round up at .5
I used the USGA calculator when we look up course handicaps when we started.
It does indicate a 1.3 Index as a CH = 1 at our Blue Tees
But, I wasn't sure how to allocate strokes for the second round on the front.
I told them I assumed and that's when the shit hit the fan... 🙂
I dealing with the old Comish who's with the STL District and the Frenchie who's always wrong. Lol
Anyway, I'll PM a link to my spreadsheet.
I think only somewhat close comparison would be if someone had used a non conforming club for extra COR (hot clubface) or something that can be used consistently over a period of time all the time for an advantage.
Or one of them rangefinders that give you slope adjusted yardage. IDK.. just taking stabs.
I'm wondering how your Blue tees would have a lower Slope but a higher CR than a Blue/White (shorter?) combo, I don't think I've ever seen that before. Beyond that, I'm wondering how you went from the equation for Course Handicap, which calculates the numbers shown in your Index column, to get the Course Handicap column. To me, the Index column numbers should simply be rounded to get Course Handicaps of 0, 4, and 7. That's also what I get from the USGA Course Handicap Calculator page.