( CNN ) -- Borussia Dortmund stretched their lead at the top of the German Bundesliga to 12 points but had to settle for a 0-0 draw with Schalke . The league leaders dominated against their opponents , Lucas Barrios and Mario Götze going close , but could n't find the breakthrough . The stalemate saw them extend their lead by a point , though second-placed Bayer Leverkusen can reduce the gap to nine if they win at Nurnberg on Saturday . Dortmund should have taken the lead inside the first ten minutes as Götze and Jakub Blaszczykowski tested Schalke goalkeeper Manuel Neuer . Lucas Barrios then rifled a shot narrowly wide of the post as the home side continued to press before Mats Hummels poked an effort wide from a free kick . Schalke had a half chance just before the break but former AC Milan striker Klaas-Jan Huntelaar headed over the bar from Jefferson Farfan 's cross . Barrios then diverted Blaszczykowski 's cross onto the post with Neuer beaten as Dortmund piled on the pressure in the second half . Efforts from Lukasz Piszczek , Lukas Schmitz and Sven Bender were repelled by an inspired Neuer . Schalke had a rare chance to take the lead when former Real Madrid striker Raul put Jose Jurado through on goal , but his shot was half blocked by Roman Weidenfeller before Marcel Schmelzer cleared the ball off the line . Then Götze squandered the game 's best chance as he collected Piszczek 's pass and rounded Neuer but could only hit the post with a shot on the turn . Schalke moved up to ninth with their hard-earned point .
Mario Gotze held to a goalless draw by Schalke in German Nurnberg . Schalke and Mario Gotze both squander chances for Lucas Barrios . Dortmund extend lead at the top to 12 points over Dortmund .