U.S. Air Force Senior Airman Charles Unruh, 28th Munitions Squadron armament support member, performs chess drills at Ellsworth Air Force Base, S.D., Sept. 24, 2024. Unruh maintains his semi-professional level of chess playing through practice, competing in regional and international level tournaments, and providing chess lessons to aspiring entry-level chess players. (U.S. Air Force photo by Senior Airman Dylan Maher)