Umrum, if you get involved in a two-up game in the middle of a run of heads and decide to ride the run ... is this a basis for a 2-up system ?

Have a look at PC and check from yr to yr how many systems disappear without trace. I could quote several but won't because of the sensitive nature of this forums managers.

Roughly 100% of systems depend on place. Now 5th can be anywhere from 0.1 lengths to 30 lengths beaten. Bong .... that's the sound of the penny dropping.

Now I've got to go and get his nibs dinner ready.