Berkshire are certain of retaining the Western Division title, as they are now 25 points clear of second-placed Oxfordshire with one game left.
But they met with stubborn resistance from Cornwall at St Austell on Tuesday and were involved in their tighest finish to a Championship game for some time.
On a 10-match winning run in the Western Division, the champions set their hosts a target of 248 and then had to work extremely hard to get among the wickets, but they managed only eight as Cornwall held out for a creditable draw.
On 99-3 overnight, Berkshire went looking for quick runs on the final day with Jack Davies (pictured) leading their run charge in superb fashion.
He lost partners James Morris (14), Michael Williams (8), Andy Rishton (18), Chris Peploe (20) and Tom Nugent (4) before finishing unbeaten with a magnificent 111.
The 19-year-old left-handed batsman faced 224 balls in his 239 minutes at the crease, finding the boundary on 14 occasions.
The dismissal of his Henley team-mate, Nugent, led to skipper James Morris declaring at 207-8 after 78 overs.
Cornwall's stand-in skipper, Andy Libby, took 3-71 to follow up his 5-46 in the first innings.
With the wicke -taking spin, Berkshire relied heavily on Chris Peploe, Euan Woods and Luke Beaven as they made their bid for victory.
Cornwall, however, had no intention of trying to bat out for a draw and went looking to end Berkshire's impressive unbeaten run.
The hosts reached 80 for the loss of two wickets, but then collapsed to 98-6, the last two wickets falling to off-spinner Beaven in his first 10 balls of the innings.
A stubborn seventh-wicket stand of 61 - which Nugent ended by having Tim Wyatt caught behind by Davies - boosted Cornwall's chances of stopping Berkshire's winning run as the tension increased around the ground.
All credit to Cornwall who had been forced to make several changes for this game with several regulars missing. They pushed the champions to the very end of a three-day match, and that doesn't occur very often.
Berkshire bowling figures today: Nugent 9-0-32-1, Rishton 4-1-14-0, Peploe 24-7-40-2, Woods 20-7-43-3, Beaven 13-4-27-2, Perera 1-0-9-0.
Berkshire next play Dorset at Wargrave CC on September 1-3, but before that, they have the Unicorns Trophy final against Cumberland at Wormsley on Wednesday of next week.
Nantwich: Cheshire 479-8 (Rob Sehmi 122, Luke Robinson 76, David Wainwright 71, Will Evans 71, Simon Normanton 51 not out), Shropshire 274 (Matt Swift 92 not out, Xavier Clarke 61) & 174 (Xavier Clarke 52). Cheshire (24 pts) beat Shropshire (5 pts) by an innings and 31 runs.
Sidmouth[/b]: Oxfordshire 211 (Jonny Cater 65) & 342 (Harry Smith 95, Jonny Cater 61), Devon 375-4 (Alex Barrow 141, Peter Trego 103, James Burke 55 not out) & 179-2 (Alex Barrow 103 not out, Jamie Baird 52). Devon (24 pts) beat Oxfordshire (2 pts) by eight wickets.
North Perrott: Dorset 340-5(Luke Webb 161, Scott Currie 67 not out) & 247-8 dec (Harry Fisher 101 not out, Andy Gorvin 5-50), Wales 248 (Andrew Gorvin 73 , Ben Kellaway 60, Oskar Kolk 55) & 132-3. Dorset (12 pts) drew with Wales (8 pts).
Brockhampton: Wiltshire 140 (Dan Conway 6-51) & 208, Herefordshire 142 (Tom Hage 50) & 207-9 (Joe King 5-55). Herefordshire (20 pts) beat Wiltshire (4 pts) by one wicket.