<prompt> Pedzisa mutsara unotevera: Vaviri veWorld Cup vanokodzera Boris Gelfand muna 2009 naSergey Karjakin muna 2015 vakakunda mukwikwidzi weCandidates uye vakatamba mumutambo weWorld Championship, mu  <response>: 2012 uye 2016 zvichiteerana. 