British Supersport series leader Alastair Seeley finished second behind title rival Jack Kennedy in the feature race of the weekend at Brands Hatch.
Dubliner Kennedy won by two seconds from the Carrickfergus rider but trails the EHA Yamaha Racing man by 30 points after four rounds and eight races.
The pair had been involved in heated exchanges on the track after Seeley, 39, pipped Kennedy in the sprint race.
Kennedy has a screw in his wrist after breaking a scaphoid at Donington Park.
Kennedy came out on top in the latest instalment of the rivalry with Northern Irishman Seeley, who was content to come away from the weekend with the same advantage in the championship points table as he arrived with.
“I didn’t get a good start and initially I struggled to stay with the frontrunners but I came back and took the lead,” said Seeley.
“Jack came back at me and managed to creep away, while I was lacking a bit of grip. Consistency is the key in contending for the championship and 20 points is better than ending up in the gravel.”
Richard Kerr was 10th in race two and lies fifth in the Supersport standings.
Farmer best of NI riders in both BSB races
Meanwhile in British Superbikes race one Clogher rider Keith Farmer secured his best result of the season by coming home sixth on his Tyco BMW.
Honda Racing’s Andrew Irwin was ninth, brother Glenn Irwin 10th on the JG Speedfit Kawasaki and Josh Elliott 15th on the OMG Suzuki.
Farmer was eighth in race two, with Glenn Irwin 10th, Andrew Irwin 12th and Elliott 15th.
Australian Josh Brookes completed a win double on the Be Wiser Ducati and lies third in the championship on 124 points, 21 behind leader Tommy Bridewell and seven adrift of team-mate Scott Redding.
Andrew Irwin is best placed of the Northern Irish contingent on ninth overall, with Elliott 11th, Farmer 12th and Glenn Irwin 16th.
McGlinchey tastes success
Eunan McGlinchey took victory in the Superstock 600s, followed by compatriots Korie McGreevy and Caolan Irwin, with championship pacesetter Aaron Clifford fifth and Sam Laffins 12th.
McGlinchey is seven points behind Clifford after the fourth round of the series.
Jordanstown’s Andy Reid had seventh and 12th place finishes in Superstock 1000cc outings, with Scott Swann third in the opening Motostar event, before crashing out in the second.
Swann still lies second in the overall standings but now has a sizeable 43-point deficit to American Brandon Paasch.