May I ask what goes into computing stretch run (SR) and best horse (BH)?

May I ask what goes into computing stretch run (SR) and best horse (BH)? — Steven

First, a little history.
My AI has two primary AI designs.

GA 47: The biggest is an engine that (essentially) created 200 "systems" and uses the "shape of the race" (as defined by the AI) to decide which system to use in each race. BTW, there are actually 2 different types - one for previous starters and one for FTS and foreign shippers.

Thus, there are actually 200 x 200 systems - resulting in 40,000 combinations.
("GA47" is a reference to this engine being my 47th Genetic Algorithm.)
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GA 37: This was a code-only system that I first developed about 15 years ago.
The purpose of GA37 was that it was MY PERSONAL TOOL for building power HANDICAPPING OBJECTS for HSH.
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Now, to your question...
I've continued developing GA37 to the point where it now does an excellent job of "integrating my specific goals directly into a fitness function." In other words, with relatively simple code, I can get "Core AI" to generate DIRECTED OPTIMIZATION towards a WELL-DEFINED SUBSET of data.

Specifically, I "told it" to bias all results in favor of horses that did not figure to be low odds.

HSH has, at it's core, about 3,500 factors, of which perhaps 500 have even an outside shot and having any real impact in the end result. (As the whales get better - i.e. the pools become more efficient - the core factors slip in value and the outliers' importance increases.

The end result was to generate 30 weighted factors for each column. These factor sets change depending upon the "AI's perceived shape of race.

Then, those factors are used at race time in a Monte Carlo Simulation.
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So, the final answer to your question...
May I ask what goes into computing stretch run (SR) and best horse (BH)?...

is, "I don't actually know."

LOL‼️ I was really expecting something like well, it is just too high a factor rating to be able to explain it. I don’t know is in the same neighborhood.

Thanks for taking the time to explain all this.