gobang Weiming Wu & Niping Wu Introduction Our final project is to design and implement a Gobang game under X-Window3.2 environment, using the Haskell programming language. Users can play the game human-vs-human. The program also provides a robot player with whom the user can play the game with. We wrote altogether ten modules which were saved in different files to control the whole game. About Gobang The checkerboard of Gobang consists of 19 vertical lines and 19 horizontal lines. Two players in turn place a unit on the checkerboard. Each unit should be put on an unoccupied intersection of a vertical and a horizontal line. The winner is the player who first makes five consecutive units on either vertical, horizontal or diagonal direction. The program is able to perform the following tasks: 1) Use a new window under X-Window interface to display the checkerboard. Players will use a mouse to place units onto the chessboard, where a unit is a circle with the color black or white. 2) Prompt for the names of both players and display them. 3) Calculate the time both players have used up. 4) Supervise the progress of the game, declare winner and end the game once one player wins. 5) At each point of the game, store the progress of the game, so players can review each step during the game. 6) There are five buttons on the screen which would provide some special services such as starting a new game, quitting the game, saving the game, importing the saved game, or reviewing the game as soon as the user selects the corresponding buttons. 7) Provide a moderately well robot player for that game (using minimum-maximum algorithm). Running Gobang A window titled "gobang" will appear on the screen. On it is a checkerboard, clocks and buttons. There will be an instruction saying "Please enter the name of player-1". The user can do two things: either enter the name of a player or choose the "import" button. Once the "import" button is selected, an unfinished game, which was saved in the file "###go.bhs###" will be imported. Please notice that the character "@" is reserved for the robot player, so if the user types in @ as the name of the first player, it is assumed that player-1 is the robot player. Then the name of player 2 is prompted. The game starts and at each turn an instruction like "Please enter your play." would appear on the screen. The user should put a unit onto the checkerboard. If the button is clicked on a wrong place or a unit is put onto an occupied position, an error message saying "Wrong Point. Please reenter." will appear on the screen and the user should reenter his play. The marker next to the name of a player indicates whose turn it is. At any point of the game the user can choose the other four buttons. If the "new" button is selected, the present game will be terminated and a new blank checkerboard will be displayed on the screen; if the "review" button is selected, one step of the previous plays will be displayed each time after the user hits any key; if the "save" button is selected, the steps so far will be saved into the file "###go.bhs###"; if the "quit" button is selected, the game will be terminated.