no decisive games yet. the score is tied 2-2 after 4 draws. but in the 2010 match against topalov , anand was already in the lead after 4 games by 2.5-1.5 ( 2 wins, 1 loss, 1 draw) . even in the 2008 match against kramnik, anand was in the lead after 4 games by 2.5-1.5 (1 win and 3 draws) .
The topalov match had 5 decisive games, the kramnik match had 4 (from 11) . In this match it seems even one decisive game would be gold and maybe enough to decide the title.