With Manchester United defeating Bolton, Avram Grant's men are now five points behind the league leaders with eight games remaining following Robbie Keane's dramatic late equaliser.
Grant still has an impressive percentage of victories but is yet to win a "big" game - against Manchester United or Arsenal in the league, Barnsley in the FA Cup or Tottenham in the Carling Cup final.
The 4-4 draw at White Hart Lane came after Chelsea opened the scoring and led 3-1 and 4-3.
"If we won would it have been a big game? We lost against Barnsley and it became a big game. Every game we drop points is a big game.
"I can be happy only that, in the league, we haven't dropped that many points, otherwise there would have been more big games.
"Every game here is big. If we didn't win we wouldn't be in this position.
"What is a critical game? Every game at Chelsea is critical.
"If we'd lost other games, we wouldn't be in this position. Every game we win is a normal game. Every time we drop points is a big game."
Keane earned Spurs a point with two minutes remaining when he curled into the top corner from 25 yards, taking advantage of a long clearance that fell to him off Ricardo Carvalho after the defender was caught with his back to the ball.
Didier Drogba had given Chelsea an early lead with a header from John Terry's cross, but Jonathan Woodgate levelled in the 11th minute when he headed home from Jermaine Jenas' free-kick.
Michael Essien and Joe Cole established a two-goal advantage for the visitors but Spurs staged a comeback and were level again through Dimitar Berbatov and Tom Huddlestone.
England midfielder Cole looked to have earned maximum points with a neat finish with 10 minutes remaining - but Keane had the last word in a thrilling evening.
