Two tries apiece from Joe Dancer and debutant Jake Ashby helped Chinnor earn a 29-19 home win over basement boys Hull Ionians.
The Thame-based side never lost the lead in an energy-sapping National League 1 fixture, but the visitors made sure they were in a game.
Chinnor’s win came at a cost, though, with George Oliver and Dancer forced off injured.
It did not take long for the hosts to open the scoring and two tries from lock Dancer helped them into a 12-0 lead after 13 minutes, Laurence May converting the first.
Chinnor extended their advantage to 19 points on 33 minutes when Ashby dived over, May adding the extras.
However, Tim Wakadu’s try, Seremaia Turagabeci converting, cut the home side’s lead to 12 at the break.
Hull started the second period in the same vein and Ben Bell was driven over to further reduce the arrears.
Chinnor looked to have regained control when Ashby crossed again for the four-try bonus point, May converting, to make it 26-12.
But sustained pressure from Hull led to Ben Whyte diving over, Marco Fummo adding the extras, to reduce the deficit to seven with six minutes to play.
Chinnor needed to control the final stages and they did exactly that when May kicked a late penalty to make sure of victory.
Director of rugby Williams said: “We can never do anything easy here.
“Obviously when you look back at the season, people will not look at individual performances, they will look at the results.
“And in our first game at home it was important we got the five points which we did, but we made incredibly difficult work of it.
“The first 30 minutes, I thought we played brilliant rugby and if it wasn’t for the final pass going to ground, being knocked on, we could have scored 30 points comfortably.
“We then made a hard fight of the last ten minutes before half-time, we lost concentration, and then the second half just became an absolute dog fight.
“Once again, the Chinnor curse of injuries rolls our way and for 30 minutes of the second half we ended up having a centre playing in the back row, a hooker in the second row, we had no jumpers on the pitch and five front-rowers within the eight – it was insane.
“So the key is we got the five points.
“Hull put up a very spirited performance, they had a never-say-die attitude until the end.
“We now have to assess where we’re at on Tuesday and obviously a big part of that will be the medical room going into a tough game against Rams who are flying at the moment.”