It ain't retro fitted because it's not a system in the retro fitting kind of system way. It's not a system in the way that System Serge's Rules or whatever it is in another thread is a system, ie -

days since last start 5.1 - 55.72
barrier - 1-13
last start placing - 2-5
fur colour - mangy - dying

It's a handicapping plan, and the top selection is the bet, given that it qualifies a couple of "system" rules - that's where the sys comes in, b/c the horse must pass a couple of mechanical rules.

But, that's why there's heaps of bets - the handicapping program applies to all races, and it was already a sound handicapping program - I just added a filter or two, if you will, tested it, and ended up here.