tsoj / engine-list

The Engine Programming Server's List of Game-Playing Engines

Chess Engines

"*" ratings indicate a missing rating from the rating lists.

"~" prefix indicates that a rating is merely approximate.

"↓" prefix indicates that the rating was obtained with an older release of the engine.

All ratings are from single-CPU lists, last updated 2023-07-17.

Engine Name	Author	CCRL 40/15	CCRL Blitz	Notes
Clover 5.0	lucametehau	3412	3565	Plant.
Seer 2.6.0	Connor McMonigle	3402	3542	Very strong engine, with NNUE trained via retrograde learning on tablebase positions.
Caissa 1.10	Witek902	3397	3519	Written in C++!
Viridithas 10.0.0	Cosmo Bobak	3385	3525	The strongest UK chess engine & the strongest Rust chess engine.
chess.cpp 3.99	Gedas	~3350	*	Very strong C++ engine, still doesn't have a proper name!!
Rice 7.0.0	Rafid	3333	3472	Written in C++
BlackCore 6.0	Szil	3310	3428	Very strong NNUE implementation.
Smallbrain 7.0.0	Disservin	3306	3433	Supports FRC & uses self-generated NNUE data.
Alexandria 3.5.0	Zuppa D. Cipolle	3258	3384	Strong C engine with VICE ancestry.
StockDory 1.1-Alpha	Shaheryar Sohail	3247	*	C++ rewrite of StockNemo.
Frozenight 6.0.0	MinusKelvin	3218	3366	NNUE chess engine that never had an HCE, learned to play chess from zero knowledge.
Stash 34.0	Morgan Houppin	3212	3310	Another very strong HCE engine. Doesn't support tablebases.
Weiss 2.0	Terje	3207	3316	A very strong VICE descendant, and one of the strongest HCE engines.
StockNemo Stingray 5.7.0.0	Shaheryar Sohail	3189	↓2933	Written in C#!
Svart 5	Crippa	3180	3261	Written in Rust!
Drofa 4.0.0	No4b	3179	3227	Drofa started as a fork of the Shallow Blue chess engine - it's now much stronger, and is among the strong HCE engines.
Nalwald 17.1	tsoj	3140	↓3194	Alpha-beta engine with BAE, written in Nim.
Altair 4.0.0	Antares	↓3002	↓3012	10x12 mailbox C++ engine.
Polaris 1.8.1	Ciekce	2987	3061	"author has a catboy as pfp" ~ crippa C++20 HCE engine that does not care about king safety!
Peacekeeper 1.60	Sazgr	~2970	3058	A C++ engine which formerly had simple evaluation, still sucks at LTC, and has 2.19999999 in its code.
Midnight 6	archi	2927	3049	"it be an engine" - archi
Willow 2.9	Adam Kulju	2956	2997	Hung a queen in its second-ever tournament game! Has a very aggressive, freewheeling style of play.
Akimbo 0.4.0	JacquesRW	~2890	*	Small engine written in Rust.
4ku 3.1	kz04px, Gedas, Gian-Carlo Pascutto, and others	~2870	↓2919	A UCI chess engine in 4 kB. The 4ku-mini script contains compressed C++ source code, that is extracted and compiled before being run. Written to take part in the TCEC's 4K tournament
ice4 v3.1	MinusKelvin & Analog Hors	~2800	*	ice4 is a chess engine which fits in 4096 bytes. Written to take part in the TCEC's 4K tournament
Mess 0.3.0	Rak Laptudirm	2770	2817	Written in Go!
Pedantic 0.3.1	JoAnnP38	2745	↓2747	Written in C#!
Apotheosis 4.0.1	Spamdrew	2743	2778	Apotheosis is a blunder-prone silly lil guy that sometimes plays cool chess.
Renegade 0.11.0	Krisz	2696	2727	A chess engine written in C++ using Visual Studio 2019. It values readability and simplicity.
Cheers 0.2.2	Algorhythm	2644	2656	A Rust HCE engine!
Princhess 0.12.0	princesslana	↓2484	↓2618	CPU-only MCTS engine in Rust!
Baislicka 1.0	kz04px	2207	2254	A chess engine written in C. Uses bitboards with fixed shift fancy movegen.
Valiant Mk 8	Enderjed	*	1046	Mk V has a startup sound, Mk 3.2 "Archer" has reversed piece square tables, Mk 2 "Valentine" barely cares about king safety, Mk2 and Mk3's sources are lost to time... Its greatest anomaly is being able to consistently beat BBC 1.4 (with Stockfish NNUE!). The 3rd strongest python engine.

Chess960 Engines

See above for notes.

Engine Name	Author	CCRL 40/2 FRC
Caissa 1.10	Witek902	3775
Clover 5.0	lucametehau	3713
Viridithas 10.0.0	Cosmo Bobak	3675
Smallbrain 7.0.0	Disservin	3539
Frozenight 6.0.0	MinusKelvin	3494
Weiss 2.0	Terje	3375
Stash 34.0	Morgan Houppin	3358
Drofa 4.0.0	No4b	3266
Altair 4.0.0	Antares	3082
Nalwald 17.1	tsoj	↓3052
Polaris 1.8.1	Ciekce	2981
Akimbo 0.3.0	JacquesRW	↓2313
Princhess 0.12.0	princesslana	↓2188

Ataxx Engines

Engine Name	Author	Notes
Scarletxx	Folkert van Heusden

GGPs & Other Game Engines

Engine Name	Author	Game	Notes
Ampersand	Corman	GGP (Fairy Chess)	Ampersand is a fairy chess engine powered by the monster-chess move generation library. It currently isn't functional.
bashtet	Analog Hors	Tetris	A bash script that plays Tetris.
Cold Clear	MinusKelvin	Tetris	The strongest Tetris engine as of the last time anyone bothered to check.
Della Baduck	Folkert van Heusden	Go

Contributing

• Engines are sorted in descending order of their CCRL 40/15 rating, or their CCRL 40/2 FRC rating for Chess960.
• If you are:
  • Updating the version-number of an existing engine, but you lack a rating for it, prefix the earlier rating with an "↓".
  • Updating/adding an engine and the error margins of a rating is >30, prefix the rating with an "~".