The chess program and its user interface can be interpreted as a Model–view–controller (MVC), an architectural pattern that isolates business logic f.i. game administration, time management and searching a move inside a chess program from input and presentation. The game model represents the domain-specific data on which the application operates - Inside a chess program, the information about the initial position and the game record to reproduce the current positions, likely subject of search or pondering during game play. The model and controller implement a finite-state machine which controls the game, its states, state transitions and actions considering various modes. The view displays the game notation, a list of moves, and likely the board with the current position, suitable for interaction inside a user interface. The controller receives input from various sources and devices, such as keyboard, mouse, serial port and internet socket, and initiates a response by making calls on model objects.