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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.
The uci_limitstrength parameter tells engines with this feature to play at a lower level. The uci_elo parameter specifies the Elo rating at which the engine will aim to play. Engines that have implemented uci_elo include Delfi, Fritz, Hiarcs, Houdini, Junior, Rybka, Shredder, Sjeng and Stockfish.
Leela Chess Zero (abbreviated as LCZero, lc0) is a free, open-source chess engine and volunteer computing project based on Google's AlphaZero engine. It was spearheaded by Gary Linscott , a developer for the Stockfish chess engine , and adapted from the Leela Zero Go engine.
A chess engine generates moves, but is accessed via a command-line interface with no graphics. A dedicated chess computer has been purpose built solely to play chess. A graphical user interface (GUI) allows one to import and load an engine, and play against it. A chess database allows one to import, edit, and analyze a large archive of past games.
Torch is a closed-source chess engine created by Chess.com. [30] [31] Torch has finished second in several Chess.com Computer Chess Championship events, only behind Stockfish in each case. [32] It initially participated in the tournament under the name "Mystery". [31] [33] It is freely useable through Chess.com's analysis page. [34]
Universal Chess Interface (UCI) engines such as Fritz or Rybka may have a built-in mechanism for reducing the Elo rating of the engine (via UCI's uci_limitstrength and uci_elo parameters). Some versions of Fritz have a Handicap and Fun mode for limiting the current engine or changing the percentage of mistakes it makes or changing its style.
Crafty uses the Chess Engine Communication Protocol and can run under the chess interfaces XBoard and Winboard. Crafty is written in ANSI C with assembly language routines available on some CPUs, and is very portable. The source code is available, but the software is for "personal use" only and redistribution is only allowed under certain ...
The next iteration of the chess engine was named Deep Sjeng 1.0 and released as a commercial program on 3/3/2003. It featured multiprocessor support and was estimated to be 200 rating points stronger than Sjeng Free. [9] The last version of Deep Sjeng won the World Computer Speed Chess Championship in 2008. Deep Sjeng is no longer for sale. [10]