The jockey thing maybe so , but for whatever reason , I have sited days where whole meetings, where the strongest jockeys just dont perform, being beaten by apprentices all day.

Try it yourself using the Neurals using the JA + JT (Jockey + Jockey Trainer) setting & test it over the first 2 Favs.
or any 2 horses where a winner was provided.

You will see over say 150 races that is 50/50

One day it will be brilliant.
The next day it falls into a hole.

Why is it so?

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Cheers.