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Except the determination of three fold [[Repetitions|repetitions]], which requires the whole move record, at least from the last [[Irreversible Moves|irreversible move]] (half-move) played, the chess position should keep track of various informations related to the position also for efficiency reasons. Another issue is to make chess positions persistent with a maximum of information required, but without the whole game history, as specified by the [[Forsyth-Edwards Notation]] or [[Extended Position Description]].
Beside piece placement, as considered by the [[Board Representation|board representation]], the [[Side to move|side to move]] is essential, which might take only one [[Bit|bit]] inside an appropriate data structure for a chess position. Additionally, the [[Castling]] ability for both sides, as reflected by the [[Castling rightsRights|castling rights]] and a possible [[En passant|en passant]] target square (or [[Files|file]]) is needed to further completely specify the position, as well as the [[Halfmove Clock|halfmove clock]] to cover the [[Fifty-move Rule|fifty-move rule]].
=Summary=
* [[Pieces|Piece]] placement on the [[Chessboard]] as considered by the [[Board Representation]]
* [[Side to move]]
* [[Castling rightsRights]]
* [[En passant]] target square
* [[Halfmove Clock]]
