Vasily Zaitsev wasn't just any marksman — his documented 427 kills during the Battle of Stalingrad were verified by a military tribunal. But what made him extraordinary was his mentor: Chief Instructor Konstantin Kuchmin, himself a veteran of the Winter War who developed a new method of distance estimation called "the Zaitsev method" — it required only judging the target's visible height, not width, reducing calculation time by half. Zaitsev's most famous duel was against Major Erwin König, a German master shooter from the Reich's sniper school — a confrontation immortalized in letters from Zaitsev's comrades to Moscow. The German officer's identity remains debated to this day; some historians believe König may have been a composite of several Wehrmacht marksmen.