The kings of the elementary school chess world now wear backpacks from Brooklyn. A team of six public school students from PS 130, The Parkside School in Windsor Terrace, pulled off a brainy upset for the ages this month — taking home first place at the 2026 US Chess National Elementary K-6 Championship after toppling some of the nation’s most elite schools. The pint-sized prodigies traveled to Baltimore earlier this month and outmaneuvered roughly 2,500 students from 35 states at what organizers called one of the largest scholastic chess tournaments in recent memory. “It was a really huge event, and the equivalent of our Super Bowl as chess players,” Alexis Paredes, the school’s program director at Impact Coaching Network , told The Post. The six-player squad — made up of fourth- and fifth-graders between ages 10 and 11 — clinched the coveted K-5 Championship section title, the highest honor an elementary school can win at the national level. And they didn’t just squeak by.…