I had a look at your spreadsheet, 10 hours, !
mate well done, i took about three weeks to try and build a dutch betting sheet for four runners, any loss would carry onto next bet and the programme would tell me what i needed to outlay to STILL return the old majic $100, still use it but one must understand it to use it, i wont post it cause it aint a shaddow of your work. I use it on a phone which flips out (wont mention names) LIKE a computer!, any way well done!
Cheers dingo