prague march 10 reuters  the czech national bank cnb can lower the countercyclical buffer rate set for banks if geopolitical and cyclical uncertainties decrease the central bank said on friday should these uncertainties decrease the cnb is ready to start gradually lowering the countercyclical capital buffer rate if it concludes that the size of the cyclical credit risks in banks balance sheets covered by the countercyclical capital buffer rate is decreasing the central bank said on thursday the central bank decided to leave the extra buffer rate for banks applied in periods of excessive lending growth at 250 the rate rose to 200 at the start of the year and is set to increase to 250 from april based on past decisions