Centre Alex Dancer got Chinnor off the mark with an early try, but Titans scrum-half Alex Dolly kicked a penalty and converted his own try on 13 minutes to move Rotherham back in front.
Dancer added another converted try for the visitors as the lead changed hands again, but the Titans hit back with winger Connor Field and hooker Ali Thomson scoring tries, while Dolly’s conversion put them 22-14 ahead.
Field’s second try extended their lead, and centre Ellis Abrahams added another to put the Titans into the driving seat at 32-14.
However, Chinnor hit back with two tries mid-way through the second half to secure two bonus points and give Rotherham a few anxious moments late in the game.
The lead changed hands six times, but Huddersfield eventually ran out 24-21 winners in their National Two (North) clash with Tynedale.
The North East side took an early lead with a converted try, but Huddersfield hit back on 21 minutes with No 8 Richard Piper touching down and centre Will Milner adding the conversion.
Another converted try put Tynedale back in front, but hooker Francis Entressengle and centre Lewis Workman both scored tries in quick succession early in the second half to put the Yorkshire side 17-14 ahead.
Tynedale once again added a converted try to retake the lead, but Piper bagged his second try and Milner converted to wrap up the win with seven minutes left.
Hull Ionians kept their place at the top of the table with a 22-12 away win over South Leicester.
The home side edged into the lead within the first five minutes but Ionians prop Benjamin Bell powered over twice to turn the tie back in favour of the East Yorkshire side.
Another forward was on the mark as second row James Newman put Ionians 17-7 up at the 40-minute mark. South Leicester got to within five but that was as good as it got as the Ionians’ impressive centre Lewis Minikin ran over for the bonus point try.
Otley lost out 29-15 at home against strugglers Leicester Lions. Hooker Joe Graham and No 8 Will Burns scored the Yorkshire side’s tries, while stand-off Ben Smith kicked a penalty.
In the battle of the Tigers, it was hosts Sedgley Park who ran out 36-29 winners over Sheffield Tigers who had to settle for two bonus points.
Centre Jamie Broadley and scrum-half Ryan Holmes had scored early tries to help the Yorkshire side into a 12-5 lead, but Sedgley Park hit back to lead 17-12.
Winger Henri Packard added another to edge Sheffield back in front at 19-17, but the hosts retook the lead three minutes later.
Replacement Thomas Taylor-Dawes added a try just after half time and Duffy kicked the conversions and a penalty, but Sedgley Park secured the win with two more tries.
Wharfedale couldn’t make it back-to-back wins after a resounding victory over Preston Grasshoppers last week as they fell to Stourbridge 37-27.
Leaders Hull ran in nine tries on their way to a 57-5 victory over Kirkby Lonsdale in the North Premier league, while Harrogate scored eight tries in a 50-12 win over Wilmslow and move up to fourth.
Elsewhere, Sandal emerged 43-35 winners from an 11-try thriller with visitors Blaydon, but Ilkley lost out 38-22 on their trip to Rossendale.
York were 34-20 winners over Bradford and Bingley to retain top spot in North One East, while Bridlington are still second after a nail-biting 28-27 victory over Huddersfield YMCA.