This framework encapsulates the critical information (rules) needed for playing or simulating a turn-based game.

A turn-based game is any game

• with two or more players,
• where only one player plays at a time, and
• the players take turns playing (it need not be round-robin, but that is the most common method).

This library also assumes that

• all the players are playing by the same rules,
• a single "move" is made for each player's turn,
  • (it can be complex set of actions involving many pieces, but a single choice is made for that complex set)
  • (the game can be written to allow "skip turn" as a valid "move"), and
• the player's turn is over after the move is made.

Some common turn-based games: Checkers, Reversi, Chess, Stratego, Connect 4.