There’s one way to guarantee yourself a good result in a biathlon race: hit all the targets. In the men’s 15 k mass start World Cup in Oslo, Russia’s Ivan Tcherezov was the only one of 30 starters to do so, and he won, by 26 seconds, over Austria’s Christoph Sumann and Norway’s Emil Hegle Svendsen. From the first loop and first shooting stage, Tcherezov was in the hunt, ensconced in a big group and...