Race Comment Explainer

Original comment with matches highlighted:

slowly away, held up in idde, smooth close over 1f out, ridden and led close home, won going away

Matched phrases & meanings

Phrase	Meaning
Won going away	This means the horse was the strongest finisher and, if the race had been longer, the margin of victory would have continued to increase.
Held up	Intentionally raced patiently at the back to save energy.
Headway	The horse was moving up through the field.
Rear	Running near the back of the field.

Summary

This means the horse was the strongest finisher and, if the race had been longer, the margin of victory would have continued to increase.
Intentionally raced patiently at the back to save energy.
The horse was moving up through the field.
Running near the back of the field.