...three points clear at the top of Group D.
Germany have 13 points ahead of the Czechs after five matches with Ireland also on 10 points having played a game more following their 1-0 win over Wales earlier on Saturday.
The Czechs had the first chance but the Germans gradually built up the pressure and in the 42nd minute Kuranyi shrugged off two defenders to head a corner past goalkeeper Petr Cech.
Czech striker Milan Baros had early chances in the second half but headed two Tomas Ujfalusi crosses over before Kuranyi put Germany 2-0 ahead in the 62nd from a Philipp Lahm centre.
Baros scored a lucky goal in the 76th minute, deflecting in a shot by Jan Polak on the edge of the box, to give the home side hope but despite several chances they could not equalise.