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TicTacToe

"The goal is to write an API for the tic-tac-toe game. An API user, should be able to play a game of tic-tac-toe using this API, but importantly, it should be impossible for the API user to break the rules of the game. Specifically, if an attempt is made to break a rule, the API should reject the program. This is often done by way of a compile-time type error."

• move: takes a tic-tac-toe board and position and moves to that position (if not occupied) returning a new board. This function can only be called on a board that is empty or in-play. Calling move on a game board that is finished is a compile-time type error. e.g. move (p1 X) (new O) ... p1 for position 1, new creates a new board.

• whoWon: takes a tic-tac-toe board and returns the player that won the game (or a draw if neither). This function can only be called on a board that is finished. Calling whoWon on a game board that is empty or in-play is a compile-time type error. As an optional consideration, whoWon should never be a draw if fewer than nine moves have been played. In the case that the game is completed, but fewer than nine moves have been played, return a value that can only be one of two possibilities (the winner) and never a draw.

More info at https://github.com/NICTA/course/blob/master/projects/TicTacToe/TicTacToe.markdown