Chelsea interim manager Guus Hiddink says doing well in the early stages of the second half was the key to his side's 5-1 win over Manchester City.
The Blues registered one of their most impressive wins of the season against a below-strength Manchester City team to reach the FA Cup quarter-finals.
They will face Everton away from home next on March 12.
"We knew we would play against a team with some changes but it's not always easy when youngsters are coming in," Hiddink said.
"They had a back four with experienced players, and youngsters in midfield and attack, but they caused a threat at the beginning and did well with the equaliser.
"You have to be very aware to not make stupid mistakes or get sloppy or complacent.
"We got sloppy with our organisation when they equalised but we had a very good reaction in the second half. It was key that we started well in the second half and got an early second or third goal.
"When the team does the job it has to do – tactical disciplined and organised defensively, and pressing high – then automatically the quality will show.
"If you win 5-1 last week, if you have an okay performance and result in Paris, and now today 5-1 against Man City then of course it's a boost for the confidence of the players. It's good to see that."