O'Brien has made three of three in the events race this week with 8-13 preferred Charles Darwin in Montaser, a clear Norfolk Stex.
The winner erupted sharply from the kiosks and Moore dominated him from this, as his mountain was sent in the final in the final to overcome the wise runner -up with two and one quarter.
“It is a large, strong and strong horse. It really looks like a four -year -old race against children in two years,” O'Brien said.
Operation and More again collected to win the Ribblesdale Award with Garden of Eden 7-1.
Putting jump on Stablemate is a strong sitting and while fading, Moore was in a good position to benefit.
The knight seemed ready to achieve victory over a serious competitor in the King George v Stakes, but the preferred merchant 3-1 has passed late to win.
Tom Marquand came with the leadership tour to the victory of the coach William Haggas and Racing Highlere owners.
