santiago center-left presidential candidate alejandro guillier concede chilean presidency billionaire conservative sebastian pinera sunday chile follow south american nations make political turn right 96.31 percent vote count world top copper producer former president market favorite pinera 54.57 percent ballot accord electoral agency servel guillier 45.43 percent guillier recognize harsh defeat urge pinera continue outgo center-left president michelle bachelet reform chile 's guillier concede presidency pinera