Race Comment Explainer

Original comment with matches highlighted:

chased leaders, pecked 6th, last, ha when slightly aft last, hampered slightly after last

Matched phrases & meanings

Phrase	Meaning
Chased leaders	Running directly behind the horses in front of the field.
ridden before	The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
No extra	Did not improve or accelerate when asked.

Summary

Running directly behind the horses in front of the field.
The jockey started urging the horse aggressively before the second-last obstacle to try and get it back into contention.
Did not improve or accelerate when asked.