Yip has had 18 wins this term and Purton has been in the saddle for 14 of those.
Moreira's sole success came aboard Fabulous Eight in the Isle Of Man Handicap — and it was a significant one as it saw trainer Ricky Yiu become on the sixth trainer in history to reach 800 career wins in Hong Kong.
“I'm happy to hit that number, very happy, and it helps give me a bigger margin over the others in the premiership,” Yiu said after extending seven clear of his nearest pursuer Francis Lui in the race for the trainers' title.
Purton and Moreira were out of luck in the feature as the Group Three Queen Mother Memorial Cup Handicap went the way of the Moore-trained Chefano.
Matthew Chadwick dictated the tempo against four rivals — three of which hailed from the same record-breaking stable — and did so with full confidence in his mount's ability to outrun the rest.
“He travelled early, got an easy time in front and he was always going to outstay them,” Chadwick said.
“I thought his run last time was the best of John's horses and he had improvement to come, so I thought he was as good if not better than the favourite.”
Moore said: “I said he'd stay all day. He's by a sire, Silvano, who went over a mile and a half and he was off a light weight, so from that point of view I had no worries about getting the distance.
“He'll go to the (Group One) Champions & Chater Cup, but that's set-weights so it's going to be much more difficult. I will consider the Champions & Chater Cup for my other runners.”