The big picture: a Chad gymnast scores top marks for determination

Behind Antonio López Díaz’s image of the inspirational Achta Derib is a story of how small changes can transform livesThe wall behind her is pockmarked and worn. She’s barefoot against a hard, cracked floor. And yet Achta Derib’s pose in this photograph by Antonio López Díaz, a finalist in the professional sports category at the Sony world photography awards, suggests reserves of determination that will carry her across continents to perform at the highe