Argh. As usual, there were careless typos in my example. I wrote 30 AB 18 AC 16 BC 25 CB B>A 52-48 A>C 48-41 C>B 53-47 but I meant 30 AB 18 AC 11 B 16 BC 25 CB B>A 52-48 A>C 48-41 B>C 57-43 Hopefully that's correct now. My apologies for the confusion. my best, James Green-Armytage