# Representation of Chess Game

The representation of a chess game includes representation of positions and moves. Positions represent states of game and moves represent operators which are used to achieve transition from one position to another. Both of these representations must be able to do the following operations:

- make move
- unmake move
- generate a list of all possible moves
- generate a list of all possible capture moves
- evaluate a position
- store moves
- compare positions
- set position
- check if position has been repeated 3 times
- check rule of 50 moves
- check if king is in check

All of these operations must be very time efficient because they take place inside the search algorithm. Efficient representation of chess game will therefore exhibit an efficient chess program and have to contains the following concepts: