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(a) Captured image by focusing on the number “3” and the chess piece “Rook” with details enlarged in the right red frame. (b) Captured image by focusing on the letter “D” and the chess piece “Pawn”. Credit: Zhi-Bin Fan, Yun-Fan Cheng, Ze-Ming Chen, Xia Liu, Wen-Long Lu, Shi-Hao Li, Shao-Ji Jiang, Zong Qin, Jian-Wen Dong