Zhang Xiaodi from Northwest China's Ningxia Hui autonomous region contemplates her next move during a chess competition at the 10th National Games for Persons with Disabilities. She has severe osteogenesis imperfecta, or brittle bone disease, and can't walk. Her father tutors her and helps her participate in many chess events, where she's won a number of laurels. [Liu Xin/Tjyun for China Daily]