KNIGHTS brushed aside their local rivals to move to within one win of a place in the Championship play-off semi-finals.
Victory over Pool B winners Cornish Pirates at Castle Park on Saturday would secure Doncaster’s place in the last four - and set up a one-off knockout game at promotion favourites Worcester Warriors.
Knights found their form at just the right time and ran in six tries to complete a comprehensive win at Clifton Lane.
The victory saw them leapfrog Bedford in the Pool B standings with one round of matches remaining after the Blues lost at the Pirates on Sunday.
Only one point separated the South Yorkshire rivals at the interval as Ollie Goss twice went over in response to tries from Daniel Baines and Louis McGowan – but a Clifford Hodgson penalty on the stroke of half time gave the hosts a slender 15-14 lead.
After the break Doncaster burst out of the blocks and, inside 15 minutes, they scored through Ed Jackson, Steve Boden and Dougie Flockhart to leave Rotherham reeling.
McGowan added a second score to reduce the deficit on the hour mark but full back Steve McColl went over in the closing stages and Tristan Roberts kicked his sixth successful conversion to seal another impressive win and set up a huge game with the Pirates this weekend.
Knights finished the regular Championship season in seventh but they are now just one victory away from reaching the elimination stage for the first time in their history.
* For more on this weekend’s crucial Castle Park clash against Cornish Pirates see this week’s Free Press.