Spinners Archie Vaughan and Jack Leach sparked a dramatic collapse for Surrey, while Somerset raised their hopes of a first-ever County Championship title with a thrilling 111-point win over the Division One leaders at Taunton.
Surrey, struggling to score 221 on a turning pitch, were bowled out for 111 with five minutes remaining, with 18-year-old Bourne taking figures of 5-38 to take match figures of 11-140 and Ritchie finishing with 5-37.
Only Dom Sibley (56) and Ben Foakes (20) attempted prolonged resistance, but a fourth wicket for 49 runs in 29 overs looked to have secured a draw until seven wickets were slaughtered for 14 runs.
Somerset extended their overnight lead of 194-9 to 224 in the second innings, thanks to an unbeaten 46 from the injured Tom Banton and 49 from Craig Overton. A 71-run win gave the team hope of a victory.
They won 21 points in the game, while Surrey won five, cutting their lead at the top of the table to just eight points with two games remaining.
Simon Harmer took his second four-wicket haul in the match. Essex Vitality County Championship innings win. Nottinghamshire Before lunch on the last day.
The South African off-spinner finished with figures of 4-93 as Nottinghamshire's batting collapsed for the second time, losing the innings by 83 runs.
The relegation-threatened visitors ended the night on 180 for 2, needing 184 to get Essex back in the bat, and while they lost their remaining eight wickets in 38 overs, they added 101 in the extended morning session. They had conceded 364 runs in the first over, having been bowled out for just 93.
Hammer was supported by Sam Cook and Paul Walter, who each scored twice to hand Nottinghamshire their fourth defeat of the First Division season.
Simon Harmer's four wickets led Essex to victory over Nottinghamshire before lunch on day four of the County Championship at Chelmsford.
DurhamMatthew Potts scored a personal best of 9 runs of 68 to help his team complete the innings and lose the game by 63 runs. Lancashire At Riverside.
Resuming play at 155 for 4 and needing 190 runs to avoid their fourth defeat of the season, Lancashire lost their last six wickets in less than a session and were bowled out for 282.
The only consolation for the visitors came from 20-year-old Matty Hurst, who scored 67 points, his second 50-point game and fifth of the season.
Potts was on a tear at one point and had a hat-trick, but Tom Bailey spurred him to three wickets from four balls after he bowled Scott Borthwick at first slip on the second ball.
He finished the match with a 126-for-12 return by knocking out Anderson Phillips just before the wicket.
Durham took 24 points from the game to virtually end any remaining fears of relegation, while Lancashire picked up a point to remain ninth in Division One.
Bowler Matthew Potts' career-best performance inspires Durham's rout of Lancashire
Will Rhodes led the way with his third century of the season. Warwickshire Secure your safety in the face of fierce competition from local rivals Worcestershire Visit New Road, Worcestershire.
Former Warwickshire captain Rose is set to end his seven-season contract with the Bears at the end of the season and sign a three-year deal with Durham.
He led Warwickshire to victory but showed his mettle by holding off the home side's onslaught and starting the final day with three wickets lost in the second innings, still trailing by eight runs.
The 29-year-old remained unbeaten on 121 points until a torrential downpour after lunch ended the match, and he needs just 46 more to become the first player to reach 1,000 points in a first-team season.
Rose received excellent support from 18-year-old Hamza Sheikh (33, not out) in his second championship game.
The result leaves Worcestershire and Warwickshire 40 and 36 points ahead of bottom-placed Lancashire respectively, with both teams looking likely to win another title in top-tier cricket.
Will Rhodes led Warwickshire to safety in the Worcestershire County Championship draw with his third century of the season.
Kent After a draw in the first division, they will survive to fight again the next day. Hampshire An exciting last day in Canterbury.
Kent were all out for 338 in the second innings. Jack Leanning made exactly 100 on 149, Harry Finch was last out on 79, Kyle Abbott took 4 on 66 and Muhammad Abbas took 3 on 69.
That meant Hampshire needed 143 runs from nine overs, but their incredible run chase lasted just 2.4 overs. They were 24-1 when the chase ended in poor light before rain returned at 5.54pm.
Kent's Jack Leaning celebrates reaching 100 runs during the Vitality County Championship match between Hampshire and Kent at the Utility Bowl in Southampton, England on July 2, 2024.
County Championship: Division 2
Tom Price and Jafar Gohar kept their cool and controlled the controls. Gloucestershire Deal with a thrilling four-wicket win at Lord's Middlesex's Vitality County Championship promotion is expected to take a serious hit.
After Miles Hammond and James Bracey both scored fifties, including 113 for the fourth wicket, the visitors looked set to cruise to their target of 234.
But off-spinner Josh de Cayes took three wickets in nine deliveries to bring Middlesex back into the contest, with the pair taking a seventh wicket to take Gloucestershire to a 54-run finish.
Gloucestershire moved into fifth place in Division Two with a second successive Red Ball win at Lord's, with the home side dropping to third, 15 points behind promoted runners-up Yorkshire.
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