Jamaican fast bowler Andy Richardson took 3-26 to help Sussex 2nd XI to their first Championship win of the season.
Sussex beat Derbyshire by 19 runs at Derby with the hosts crumbling to 226 all out in pursuit of a target of 246.
The 26-year-old trialist Richardson swung the game on his debut by taking two wickets in two balls as Derbyshire collapsed after being well placed on 225-6 at one stage.
Former Surrey batsman Steve Thorpe top scored with 49 as Derbyshire, who went into the final day with all their second innings wickets standing, failed in their attempt to make the highest total of the match batting last.
Scores: Sussex 191 and 237; Derbyshire 183 and 226.
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