The sudoku board of the Sudoku Instructions Program gives a clear identification
of each column, row, square and box:
The columns are named column A, B, C, D, E, F, G, H and I.
The rows are named row 1, 2, 3, 4, 5, 6, 7, 8 and 9.
Each square is identified by its column and row, e.g. B7
The nine boxes of 3 x 3 squares are named box J, K, L, M, N, O, P, Q and R. These
letters are used to avoid confusion with the column letters. The box names are shown
as large capital letters in light gray in the box background.
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