berlin germany conservative chancellor angela merkel may fourth consecutive national election face huge challenge try forge three-way alliance party far apart political spectrum despite win vote merkel bloc slump bad result since 1949 significant term government build current social democrat spd coalition partner say would go opposition slump 20.7 percent projections post-war low merkel indicate one option govern jamaica name give tie-up conservative bloc pro-business free democrats fdp environmentalist green fact island flag make black yellow green color three party projections put conservatives comprise merkel christian democrats cdu bavarian christian social union csu 33.0 percent fdp 10.6 green 8.9 enough workable majority alliance untested federal level collapse january 2012 western state saarland little two years although try since may northern state schleswig-holstein national level would overcome deep differences eu reform tax energy immigration green fdp fear alienate supporters compromise would make play likelihood partnership prospect share power europe big economy powerful incentive however may also feel duty ensure far-right alternative germany afd whose anti-islam anti-immigrant rhetoric many raise uncomfortable echo germany nazi past become main opposition party fuel voter anger merkel decision 2015 admit around million migrants mostly flee conflict middle east afd 13 percent vote become third-biggest bloc first far-right party national parliament half century difficult responsibility country want new elections say conservative interior minister thomas de maiziere add scenario would probably give momentum afd ultimate coalition deal may show germany commitment democratic value secure broad agreement policy pro-business fdp left-leaning green particular pole apart green co-leader cem ozdemir say party would participate anti-european populism coalition conservatives fdp although low-tax red-tape-cutting fdp traditionally pro-european party young leader christian lindner reject ideas put french president emmanuel macron deep euro zone integration want reverse trend country become apparent talk goals achieve course available would task go opposition say lindner also say russia annexation crimea ukraine 2014 might accept permanent provisional arrangement hard see merkel could swallow green emphasize climate policy want commitment phase coal power 2030 would difficult party agree refugee policy also challenge especially fdp merkel bavarian partner csu take much hard line green limit immigration berenberg economist holger schmieding argue carve-up ministries jamaica coalition wolfgang schaeuble conservative finance minister since 2009 may yield post fdp would tilt domestic discussion bite toward serious income tax cut say hurdle high merkel three-way 'jamaica tie-up talk