Race Comment Explainer

Original comment with matches highlighted:

made all far side, asserted well over 1f out, unchallenged final ,

Matched phrases & meanings

Phrase	Meaning
Challenged	Attempted to overtake another horse.
Made all	Led the race from start to finish.
Furlong	Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).
readily	The horse won easily, without having to be pushed to its absolute limit, suggesting it had more to give.

Summary

Attempted to overtake another horse.
Led the race from start to finish.
Unit of distance; one furlong is 1/8 of a mile (approx. 200 meters).
The horse won easily, without having to be pushed to its absolute limit, suggesting it had more to give.