Chaos
When I first started, it was with Sartin's stuff. That was a great age and I seemed to do well from time to time, but just never seemed to make much real profit.
When I added running style based on how the horse actually ran instead of how he projected to run, that changed everything.
I think the 1st Dave S seminar I went to was about 92 or 93. I remember that he put up an example with a horse that was entered for $10k but had once been a $50k claimer. The horse had these huge numbers and they all said that the horse would just demolish the field right from the gate.
Dave showed that the profile of the race was definitely EP. He also showed that this horse had never been near the lead in his life, and numbers or not, it was unlikely he'd start today.
If that was true, if it really happened that way, this 2/5 favorite was a likely loser. My entire belief system was based upon the numbers. This horse had the numbers, and I bet the race, keying that 2/5 shot over my other contenders.
When that 2/5 horse didn't get within 5 lengths of the gate-to-wire winner until deep stretch, I was instantly sure that I'd just learned a valuable lesson. Missing the obvious $52 winner hurt, but in the end, that lesson turned me into a professional player.
In my handicapping, early/late energy will never replace running style.