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Ethereal is greatly influenced by Stockfish, MadChess, and Crafty. In addition to the conventional alpha-beta framework, it uses a variety of reduction, pruning, extension, and other improvements.
18 Best Chess Engines of 2019 | Based On Their Ratings.
The engine supports up to 64 cores, Syzygy endgame tablebase, and Fischer random chess. Kodomo lets you save engine’s analysis of a position so you can check it later and resume analysis. You can also control how the engine makes long-term sacrifices of pawn structure for dynamic play.
Xiphos is an open source chess engine written in C and distributed under GNU General Public License. It’s a UCI compliant engine that utilizes bitboards with ERLEF mapping.
11. Schooner.
CCRL Rating: 3564 CEGT Rating: 3512.
10. Xiphos.
Stockfish is an open source UCI engine available for various desktop and mobile platform. It is based on another open source chess engine named Glaurung. As of 2017, Stockfish artificial intelligence is used by Lichess, an online chess site.
Among these organizations, the most famous are CCRL (Computer Chess Rating Lists) and CEGT (Chess Engines Grand Tournament). Keeping both these ratings in mind, we are presenting the most advanced Chess Engines that demonstrate machine’s domination over humanity.
1. Stockfish.
Its performance has been improved a lot in the recent years: a simpler evaluation inspired by Xiphos, staged move generation and tons of testing and tuning are responsible for those improvements.
Booot is an open source chess engine written in Delphi 6. It determines sliding piece attacks with rotated bitboards, and is packed with lazy SMP and fully redesigned evaluation function.
SugaR engine is derived from Stockfish, and supports up to 128 cores. Like Stockfish, it is not a complete chess program and requires compatible GUI like XBoard with Arena, PolyGlot, Shredder, Sigma Chess and Chess Partner in order to be used fully.
Ethereal is an open source engine developed by Andrew Grant. It’s a UCI-compliant chess engine first released in 2016 under GNU GPL license.
There are numerous rating lists that measure the relative strength of the chess engine, based on how many moves they make per minute. Along with ranking chess engines, the lists also provide margins of errors on the given ratings.
14. Chiron.
6. Fizbo.
8. Booot.
Xiphos uses sliding piece attacks which are evaluated by either PEXT bitboards (for BMI2) or magic bitboards. If you want to try, you can run this engine on Windows, MacOS, and Linux.
CCRL Rating: 3324 CEGT Rating : 3153.
The engine has a good understanding of material imbalances and has incredible endgame knowledge. It also understands the fortresses and trapped pieces and can sacrifice material for the initiative on king attacks. Moreover, the engines’ time management is tuned for the Fischer time controls.
17. Critter.
Chiron is the commercial chess engine that supports both Universal Chess Interface and Chess Engine Communication Protocol, and several endgame tablebase and bitbase formats.

The Fire engine features magic bitboards, Syzygy tablebases, configurable hash, and multiPV. You can configure it with over 70 Universal Chess Interface options, and apply SMP parallel search.
CCRL Rating: 3324 CEGT Rating: 3193.
CCRL Rating: 3529 CEGT Rating: 3444.
CCRL Rating: 3229 CEGT Rating : 3094.
asmFish is built with some structural optimization techniques, such as the elimination of piece lists. Critical functions don’t conform to the x86 ABI concerning the usage of register and calling convention. However, less time-critical functions were ported through GCC assembly output. Moreover, the engine supports parallel search, large pages and is NUMA aware.
Komodo was derived from an older search engine, Doch, as a major rewrite and a port of Komodo to C++11. It has a quite different positional style as it relies on evaluation, instead of depth. Komodo has won three-times Top Chess Engine Championship.
CCRL Rating: 3337 CEGT Rating : 3209.
If you construct a complete tree of all possible moves in a chess board, the total number of positions would be about 10 120 . That’s an extremely large number. To put that into context, there have been only 10 26 nanoseconds since the Big Bang and estimated 10 75 atoms in the entire universe. These numbers are dwarfed by the number of possible moves in chess, making it one of the most complex board game.
9. Deep Shredder.
asmFish is a Stockfish engine port in x86 assembly language, which uses BMI2 and AVX2 instructions optionally. It is assembled with FASM for Linux and Windows platforms.
Fizbo is a Chess Engine Communication Protocol, first released in 2014. It is based on bitboard and uses population count instruction. For now, the engine is compatible with Windows and requires CPU with pop-count instruction.
7. Andscacs.
CCRL Rating: 3284.
Equinox is a symmetric multiprocessing chess engine primarily developed by Giancarlo Delli Colli, taking ideas from open source engines like Stockfish, Crafty, and Ippolit.
Gull Engine features generic function templates in recursive search routines and several other functions for move generation (excluding ‘hash move’ and ‘side to move’). LazyGull is derived from Gull 3 and features Syzygy Bases, PDEP bitboards and Lazy SMP for modern x86 processors.
GullChess is an open source engine that applies magic bitboards to determine sliding piece attacks. It is mostly written in C++ programming language and contains only one source file.
CCRL Rating: 3232 CEGT Rating : 3098.
Equinox is active in several private engine tournaments, including Italian Open Chess Software Cups and Thoresen Chess Engine Competition.
Fizbo performs parallel searches based on enhanced PV splitting algorithm, along with iterative deepening. Transposition table with 8-byte entries is used in quiescence search.
The new version of Houdini comes in 2 variations – Standard and Pro. The previous version supported up to 8 processor cores only, whereas the Pro version supports up to 128 cores, 128 GB of RAM and is NUMA aware. Also, it can use Nailmov endgame table bases.
2. Houdini.
Schooner uses alpha-beta search, late move reductions (LMR), principle search window (PVS), and single hash entry. It supports a subset of Universal Chess Interface to automatically play games without consuming much time.
CCRL Rating: 3533.
Hannibal is a Universal Chess Interface (UCI) engine that incorporates ideas from earlier engines, Twisted Logic and LearningLemming. It uses alpha-beta technique with several other chess specific heuristics and relies on a selective search.
CCRL Rating: 3347 CEGT Rating: 3211.
It applies parallel search on multiprocessor architectures and implements pawn blockage detection that not only detects blockages in pawn endgame but also other pieces on the board. The latest version has been tuned deeply, especially in terms of passing pawns and mobility, and several search enhancements have been introduced, like Lazy symmetric multiprocessing, forward pruning, and NUMA awareness.
Critter is the UCI chess engine available for Windows, Mac, Android, and Linux. You can use it for private purpose only. It was initially written in Delphi but later converted to C++ using Bitboard technology in order to increase the performance on 64-bit processors.
Fire is a free chess engine that was used to be open source but later became a closed Windows executable, available for new Intel processors. It was initially known as Firebird and later renamed to Fire due to trademark naming conflict.
CCRL Rating: 3430 CEGT Rating: 3319.
4. Fire.
Houdini is known for its engine’s positional style, ability to defend strongly, tenacity in hard positions and escape with a draw. Till date, it has won 3 seasons of Top Chess Engine Championship.
CCRL Rating: 3326 CEGT Rating : 3234.
3. Komodo.
The engine features null move pruning, forward pruning, principal variation search, parallel search with up to 8 threads, blockage detection in the endgames, and supports Gaviota tablebases.
A chess engine usually analyzes thousands of outcomes before making an efficient move. Since the hardware and programming techniques are getting better year by year, chess engines are becoming more intelligent. Modern engines are more selective and have a better positional understanding.
Deep Shredder is the multiprocessor version of Shredder. It comes with a graphical user interface, developed by Millennium Chess System, which supports Universal Chess Interface and compatible with other UCI engines available for Mac OS, Windows, and Linux.
5. Ethereal.
CCRL Rating: 3508 CEGT Rating: 3424.
CCRL Rating: 3506.
CCRL Rating: 3386 CEGT Rating: 3290.
CCRL Rating: 3261 CEGT Rating : 3183.
12. GullChess.
16. Suger XPro.
CCRL Rating: 3253 CEGT Rating : 3122.
First published in 2014, Andscacs soon evolved into one of the world’s best chess engines. It uses magic bitboard to speed up the attack calculations. It applies a principal variation search with transposition table inside an iterative framework.
18. Hannibal.
Andscacs features static exchange evaluation, threaded parallel search, and it tries a hash move in quiescence search even in the case of a quiet move. In order to make the engine more powerful and efficient, about 200 evaluation features were optimized with 750,000 positions, which minimized the standard deviation of Andscacs’ static evaluation.
WCCC 2011, Booot vs Alex Morozov.
13. Equinox.
CCRL Rating: 3241 CEGT Rating : 3123.
Written in C++, the engine can utilize up to 512 CPU cores and maximum size of its transposition table is 1 Terabyte. It implements alpha-beta search and uses bitboards. And of course, it features aggressive pruning and late move reductions.
15. asmFish.
SugaR engine defaults to one search thread, therefore it’s recommended to inspect Threads UCI parameter to make sure it matches the total number of CPU cores. Since the engine is distributed under the General Public License, you are free to modify and sell it.
Shredder is a commercial chess engine built in 1993. It has won more than 20 titles, including World Microcomputer Chess Championship (1996, 2000), World Computer Chess Championship (1999, 2003), World Chess Software Championship (2010), and World Computer Speed Chess Championship (5 times).
The engine applies PVS with all basic search enhancements like late move reductions, null move pruning, and internal iterative deepening. The latest version supports multiprocessor architecture and has several assembly variants for 32 and 64 bits.
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