What I found that it does well is grade a race for difficulty. If there's a lot of high percenters then you know it's a hard race to short list a winner.

The other thing I noticed it did is find the boxed quinellas from the top 4-5. I found regular wins when the top pick was 65% or better and there were no more than two 40% in the entire field. You can then box the top 4-5 (so long as they either included one or two of those 40% or they were higher than 40%)

Check it out!