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@DM showed one possibility, which would also work with bishops (and on various other places on the board, with the three pieces at corners of a square). The only other option is with knights: [FEN "8/1k6/8/8/5N2/8/1N3NK1/8 w - - 0 1"] 1. Nf2d3


Yes, it's possible for a piece to need both the rank and file to distinguish it, although it's rare. For example: [FEN "8/1k6/8/8/5Q2/8/3Q1QK1/8 w - - 0 1"] 1.Qf2e3

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