Conversation so far:
What was the biggest race Affirmed won in 1977?
In the Hopeful Stakes, Affirmed pulled away in the final sixteenth of a mile to win by half a length.
What was Affirmed's time in the 1977 Hopeful Stakes?
Affirmed's time of 1:152⁄5 for 6 1⁄2 furlongs was a new stakes record.
How fast did Affirmed run at the Belmont Park?
Where did Affirmed race after the Belmont?
Affirmed followed Belmont up with a win in the Youthful Stakes on June 15 where he defeated Alydar by eight lengths.
Was Alydar Affirmed's biggest rival?
Affirmed was known for his famous rivalry with Alydar.
Did Affirmed stop racing prior to Alydar?

Question: What was the highest purse Affirmed won?
Self-contained rewrite: What was the highest purse Affirmed won?