Richarlison opened the scoring in the second half with 49 minutes of play and Sigurdsson, 72, after a failed penalty, made the final attempt that leaves Sarri again in a difficult situation.
After a draw with Wolves last week, Sarri’s Chelsea came back from a 2-0 home defeat to a Portuguese coach in the English Premier League on Sunday.
Richardson’s header early in the second half began the ‘blues’ at Goodison Park, with Sigurdsson closing in the 72nd minute and giving Marco Silva three important points.
After the first lap at Stamford Bridge, they had caught up with the Blues with a 0-0, the Portuguese coach, who today had André Gomes in the starting lineup, deepens the blues crisis.
With this result, the Toffees rise to 11th place in the league table and Chelsea loses the opportunity to overtake Manchester United, which this day went blank due to a game for the FA Cup.
Everton now has 40 points, 17 fewer than Chelsea’s sixth-place finish.