WASHINGTON POST - Nov 11 - Tinder released an updated version of its matching algorithm. CEO Sean Rad promised that it would revolutionize the quantity of matches. According to Northwestern University's psychologist Eli Finkel, relationship success depends on three things: individual characteristics, quality of interaction and surrounding circumstances. Matching algorithms tend to focus on personality alone. And large-scale studies of married couples have shown that the similarity of partners' personalities accounts for only 0.5% of how happy they are.