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Android app based chess gaming app Droidfish employs both CuckooChess and Stockfish chess engines. [3] Similarly, Kickstarter funded AI based virtual reality chess game Square Off also uses CuckooChess engine. [4] It has an ELO rating of 2583 (as of July 2018) and a rank of 135‑137 in the Computer Chess Rating List. [5]
On the November 2007 SSDF ratings list, Crafty was 34th with an estimated Elo rating of 2608. [4] 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 ...
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 .
Most contemporary chess engines are command-line programs which generate chess moves, but which require a separate chess graphical user interface in order to display a chessboard. The main article for this category is Chess engine .
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]
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.
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]
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.