Richarlison and Gylfi Sigurdsson scored second-half goals to give Everton a hard-earned 2-0 victory over Chelsea.
Everton eased the pressure on Marco Silva and dented Chelsea's top-four hopes with a morale-boosting 2-0 win at Goodison Park on Sunday.
Richarlison punished Chelsea's profligacy just after half-time and Gylfi Sigurdsson converted the rebound from his own saved penalty to secure only the Toffees' second victory in nine Premier League games at home.
Marco Silva's men, who dramatically lost 3-2 at Newcastle United last time out, were thoroughly outplayed in the first half, but an improved performance from Jordan Pickford helped keep the visitors at bay.
Defeat for Chelsea, their first since the EFL Cup final, leaves them three points adrift of fourth-placed Arsenal with eight games remaining.