santiago conservative billionaire sebastian pinera say would court centrist monday bid regain grind chile presidential election surprise surge leftists sunday first-round vote pinera face tight dec. 17 runoff center-left alejandro guillier also likely deal opposition promise tax break next left-leaning congress triumph former president run chile 2010 2014 pinera place first 36 percent vote two main left-leaning rival make stronger-than-expected show garner combine 43 percent congressional elections also take place sunday left-of-center lawmakers outnumber pinera chile vamos vote bloc congress complicate plan cut corporate tax rate slash red tape top copper exporter market price new four-year term pinera sink monday chile stock index take big daily dive six years peso currency suffer sharp depreciation since 2013. go tight hard-fought election pinera tell foreign media monday capital santiago boost chance win pinera say would tap popular lawmakers-elect bloc help guide campaign go appeal center kind people want moderation say pinera go listen humility majority chileans want monday night center-left christian democratic party endorse guillier without condition presidential candidate carolina goic moderate run pinera leave garner percent vote sunday contest accord vote tally many chileans want change new leftist group frente amplio criticize chile model free-market provision service promise tax mine company super-rich perform much good expect bloc presidential candidate beatriz sanchez secure 20 percent vote field eight double support predict pollster cep block first senate seat around 20 seat low house congress single bloc control congress pinera victory december long sure thing say election forecaster political scientist kenneth bunker air right bunker say dumbfound result start come another bad sign pinera chileans go poll big number expect sunday analysts say low voter turnout favor pinera supporters tend good show vote chile country 17 million people 250 billion economy one latin america business-friendly stable nations since transition democracy 1990. economy slow however average growth rate 1.8 percent outgo president michelle bachelet term low copper price drag government revenue guillier promise deepen bachelet policies expand access free university education protections strike unions without depart chile free-market economic model tricky task ahead attract support chile wide-ranging left-of-center voters part see many continuation bachelet unpopular government slam pinera step backward chile sanchez 46-year-old former radio journalist could rally supporters vote guillier likely exchange policy concessions mr guillier want us vote go give beatriz proposals sanchez supporter salesman hector mino say cite sanchez plan wipe student debt overhaul public-private pension system ensure big payouts possible offer too-sharp leave turn could push centrist pinera left-leaning blocs weigh possible alliances far-right jose antonio kast throw weight behind pinera kast nearly percent vote urge chileans cast vote pinera runoff go demand anything return say kast defend decease chilean dictator augusto pinochet campaign pinera aim center tight battle chile 's top job