Nicolas Jackson goal saw Chelsea beat Brighton in an intense game to reach the Carabao Cup fourth round at Stamford Bridge.
These two sides have dealt with each other a lot in the past 12 months with 10 members of staff having moved to Chelsea for around £200m – and the match carried an extra edge.
Jackson’s winning strike came in the 50th minute after a fine move.
That goal was the first Chelsea had scored in four matches and gave them a much-needed boost as boss Mauricio Pochettino looks to get his project moving in the right direction.
Ian Maatsen played the ball to Cole Palmer – excellent on his first start – who put the ball through Jan Paul van Hecke’s legs for Jackson to sweep home into the bottom corner.
Solly March had the chance to get Brighton level late in the second half when he was left unmarked but his header was straight at former Seagulls keeper Robert Sanchez.
Chelsea’s line-up included three former Brighton players and every time they touched the ball early in the match they were jeered by their former supporters.