Chelsea's defensive stubbornness saw them conquer Liverpool and catapult themselves back into title contention, says Graeme Souness.
The Blues recorded a 2-0 win at Anfield on Sunday afternoon, courtesy of goals from Demba Ba and Willian, to clip the Reds' lead at the top of the table to two points.
Chelsea became only the third side, after Southampton and Arsenal, to prevent Liverpool scoring in the Premier League this season and Souness says the result has blown the title race wide open.
"I thought Liverpool would have a very difficult game today but sneak over the line," Souness told Sky Sports. "Instead, you saw a Chelsea who were absolutely faultless in their game-planning.
"They were up against a team that scores goals for fun - Liverpool have scored 96 times this season and have got so many threats in their team - but Chelsea made them look impotent.
"They were fantastic in the way that they set out and carried it out - they frustrated Liverpool from the very first minutes and didn't allow any momentum to build - so don't forget them [in the title race].
"This result will knock their tails up, but I think we should all forget trying to predict anything now!"
Chelsea chief Jose Mourinho threatened to field a weakened team for the match at Anfield with the second leg of the Londoners' Champions League semi-final with Atletico Madrid taking place on Wednesday night.
Yet, while Czech defender Tomas Kalas, 20, made his Premier League debut, seasoned campaigners like Jon Obi Mikel, Frank Lampard and Branislav Ivanovic started for the visitors.
And Souness' fellow pundit Niall Quinn says both manager and players alike showed how vital the high-stakes game on Merseyside was to them as the Stamford Bridge side chase a first Premier League crown since 2010.
"Mourinho was fooling around with us in the week and saying that it almost wasn't as important a game as it should be, but he showed otherwise with his team and the way that they responded," said Quinn.
"It was a classic Jose Mourinho day and I'm beginning to think we should disregard everything he says from Monday to Friday!
"But this has changed everything and Chelsea fans will now believe they can win the title."
Former Chelsea and Liverpool coach Steve Clarke also watched the heavyweight battle for Sky Sports and says the Blues should not be criticised for any time-wasting en route to their victory.
Clarke pinpointed the visitors' dominance of the opening period of the game as one of the key reasons for their triumph - but still views Liverpool as the side most likely to lift the Premier League trophy aloft come May.
"Chelsea came to interrupt Liverpool's flow and if that meant stalling things or using gamesmanship that's what they had to do," said the ex-West Brom manager.
"They controlled the first 20 minutes and after that Liverpool started to get a bit nervous and anxious, perhaps for the first time.
"However, I would class Chelsea as outsiders for the title, and because Man City have some tough games and I think Liverpool have the firepower to win their last two games, Liverpool are my favourites."
After Sunday's results who are your Premier League title favourites?