Chelsea manager Antonio Conte says giving away two goals in the first half of the game made life difficult for his side against Liverpool.
The Reds were 2-0 up after 36 minutes as the Blues struggled to cope with the pace and intensity of Jurgen Klopp's men.
The Blues pulled one back in the second half but it was not enough as they fail to close the gap at the top of the table.
"In the first half, I must be honest, I think we gave away two goals," Conte explained.
"The first goal came after a free-kick which they took very quickly and the second after a throw-in. From long distance it was a great goal but when you give away two goals in that way it's very difficult.
"These are tough games and I think you must pay attention in every moment, every single minute of the game, because that makes the difference. In this case we paid because after the first half we were losing 2-0 and then it's very difficult.
"In the second half we scored the goal and then missed a chance to draw level through Costa. We had some chances to draw but it was too late.
"Every single game is very tough and we mustn't forget last season.
"That's important because it was a bad season and I don't want to repeat that. When you finish in 10th place it's something strange, it's not natural or simple. It means we have to work very hard to improve."