Two thirds of Greeks believe their leftist government will have to climb down in its standoff with international creditors and deliver the bulk of concessions needed to seal a deal, an opinion poll showed on Monday. In the poll by GPO for Mega TV, 67.8 percent of respondents expected most of the compromises to be made by Athens. Only 19.4 percent believed the lenders, including the European Union, the European Central Bank and the International Monetary Fund, will yield more to reach an agreement to unlock remaining aid.