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Runaway British Superbike Championship leader Shane Byrne has built on his advantage at the head of the table after coolly taking full advantage of an error that would deny Ryuichi Kiyonari a tremendous double at Knockhill.

Starting from pole position by virtue of his fastest lap in race one, Byrne got the hole-shot into the first turn and set about trying to escape the pack behind, with race one winner Kiyonari the only rider to go with him as they pulled away.

Seemingly comfortable following the Rapid Solicitors Kawasaki, Kiyonari seemed capable of making it a double victory for Buildbase BMW team and duly made his move with a pass for the lead on lap 20 of 30 at the hairpin.

However, though he would immediately put air between himself and Byrne, an error coming out of the hairpin a lap later, where he got out of shape on the exit and seemingly missed a gear, allowed his rival to snatch the lead again and go 1.3secs clear.

Though Kiyonari mounted a charge right to the chequered flag, closing to the tail of Byrne on the final lap, he would ultimately run out of time to set about passing Byrne, the two most successful BSB riders of all time finishing line astern in the favour of Byrne.

A sixth win in eight races, Byrne's overall lead in the standings now stands at a mammoth 79 points over Josh Brookes, though this is reduced to 22 points in terms of the more crucial podium credits.

Behind Kiyonari, Chris Walker continued his impressive season with an uncontested run to third place, the GBmoto Kawasaki rider finishing comfortably ahead of Brookes in fourth place and Stuart Easton - who started three spots lower in seventh as punishment for contact with James Ellison in race one - in seventh.

Dan Linfoot continued his streak of consistent top ten finishes with a run to sixth, ahead of Tommy Bridewell who had to fight his way back from 13th after an earlier error. His late charge would demote Ellison to eighth at the end of a disappointing day for the title contender.

Anvil Hire TAG Kawasaki's Richard Cooper picked up a ninth place finish after prevailing in a battle with Michael Rutter, who nonetheless scored his first top ten finish of the season for Bathams BMW.

Outside the top ten, John Hopkins worked his way up to 11th after an earlier error to finish ahead of Jakub Smrz, Peter Hickman, Keith Farmer and Ian Hutchinson.

An already depleted grid after four non-starters, James Westmoreland and Barry Burrell were two early retirees after tangling on the first lap at the hairpin.

Beyond Byrne, Brookes has ascended to second in the standings, ahead of Ellison, while Bridewell, Kiyonari and Walker make up the remainder of the all-important top six, with Easton and Linfoot just a few points adrift too.