The Frenchman was impressed with his side's victory against Tottenham and believes the result blew the battle for the Premier League wide open.
An early goal from Tomas Rosicky gave the Gunners a narrow 1-0 win at White Hart Lane and kept them level on points with second-placed Liverpool, who thumped Manchester United 3-0 at Old Trafford.
The results mean the two sides sit four points behind the Blues with a game in hand each – while Manchester City lurk in fourth with three games in hand on the leaders – and Wenger is sure the race for the trophy will go to the wire.
"We wanted to get back in the race and the defeat of Chelsea, the win of Liverpool and of Man City away makes the final sprint very interesting,” he told Arsenal's official website. "It put us back in a good position.
"It's not in our hands because even if we win our game in hand we are still a point behind but if we continue to win our games that will of course be very important. Then it is in our hands. Then it's just focus, recover, focus and try to win the next game."
Arsenal needed to be at its best to win at White Hart Lane, with a spirited Spurs intent on victory, and Wenger was impressed by the focus his defenders displayed during the game.
"It's a very good day for us because we were under pressure to win this game and we won it," he said. "The pressure of Tottenham was great, but we absorbed it well with a great focus, great performance from our defenders and on the break we always looked dangerous.
"But we couldn't finish the game off. So we needed zero mistakes at the back and did that in a very convincing way.”