Richard Bird's Haskell program to solve Sudoku, both the final product and the process of deriving it from a series of less efficient versions, as described in

Richard Bird's Haskell program to solve Sudoku, both the final product and the process of deriving it from a series of less efficient versions, as described in his functional pearl paper [1] [1] https://www.cs.tufts.edu/~nr/cs257/archive/richard-bird/sudoku.pdf https://www.cs.tufts.edu/~nr/cs257/archive/richard-bird/sudo...