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CuckooChess is an advanced free and open-source chess engine under the GNU General Public License written in Java by Peter Österlund. CuckooChess provides an own GUI, and optionally supports the Universal Chess Interface protocol for the use with external GUIs such as Arena.
Board representation in computer chess is a data structure in a chess program representing the position on the chessboard and associated game state. [1] Board representation is fundamental to all aspects of a chess program including move generation, the evaluation function, and making and unmaking moves (i.e. search) as well as maintaining the state of the game during play.
Font depictions of Unicode chess symbols (in the same order as the table): DejaVu Sans, FreeSerif, Quivira, Pecita. GNU Chess using Unicode chess characters to display a chess board in the terminal. Unicode has text representations of chess pieces. These allow to produce the symbols using plain text without the need of a graphics interface.
Zobrist hashing (also referred to as Zobrist keys or Zobrist signatures [1]) is a hash function construction used in computer programs that play abstract board games, such as chess and Go, to implement transposition tables, a special kind of hash table that is indexed by a board position and used to avoid analyzing the same position more than once.
At the World Computer Chess Championship in Reykjavík in 2005, Fruit 2.2 scored 8.5 out of 11, finishing in second place behind Zappa.. Until Version 2.1 (Peach), Fruit was free and open-source software subject to the requirements of the GNU General Public License and as such contributed much to the development in computer chess in recent years.
OTB (over-the-board) ICS (Internet Chess Server) FEN: The initial position of the chessboard, in Forsyth–Edwards Notation. This is used to record partial games (starting at some initial position). It is also necessary for chess variants such as Chess960, where the initial position is not always the same as traditional chess.
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Negamax can be implemented without the color parameter. In this case, the heuristic evaluation function must return values from the point of view of the node's current player (Ex: In a chess game, if it is white's turn and white is winning, it should return a positive value. However if it is black's turn, it should return a negative value).