In January 2018 Bournemouth beat Chelsea at Stamford Bridge, a result their manager Eddie Howe described as their "best result" since their promotion to the Premier League.
They remained level at half-time, despite Bournemouth demonstrating signs of promise during the first half, and then took the lead when Callum Wilson scored six minutes into the second half.
Junior Stanislas then doubled their lead, before former Chelsea defender Nathan Aké scored their third, securing all three points.
A year later, incidentally, Howe oversaw a 4-0 home victory over the same opponents, on that occasion managed by Maurizio Sarri. Most recently – in December 2019 – they won again at Stamford Bridge, this time when Frank Lampard was Chelsea’s manager.