TGJB,

I'd like to ask you a question related to some of your comments.

You laid out the case for route vs. sprint variants very well.

I would assume you have charts that show the relationhips between the sprint distances.
In other words, horses that run 6F in "X time" are approximately eqivalent to horses that run 7F in "Y time".

Do you find that there are days when the track is especially tiring and 6F in "X" = 7F in "Y" breaks down and becomes 6F in "X" = 7F in "Y + Z" or vice versa when the track less tiring than normal?

(same for routes 8F vs 9F etc..)

In this case I am not talking about how uniform the speed of the track is in various sections of the oval. I am also not talking about the impact of wind. I'm more or less talking about how tiring the track might be on different days changing the relationships.