Computer Chess @WestportChess

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Computer Chess Links
Watch live computer chess
See the best engines duke it out at TCEC or

Watch Leela Chess Zero (and other Lc0 flavors) get tested on Twitch or YouTube at @potato_chess@mattblachess@ipmanchess@brinansee@edosaniMark Young, and sometimes @westportchess
Free chess engines - Here are some of the strongest
asmFishBrainFishCorChessEtherealFireFizboKomodo 9LaserRaubfischShashChessStockfishStockfish DEV (development) versionsThothFishXiphos,  and many more at

We also have some computer chess engines to download here.
Free AI chess engines
Leela Chess Zero (Lc0) - an AI engine
Download the latest release here ("blas" for CPU-only; "cuda" for NVIDIA GPUs; or "OpenCL" for other GPUs). Here is an installation guide. This is how to set it up in a GUI. You need to download a neural network (NNs 42850, 32930, and 11248 are very strong, but any of the latest NNs will work fine. [Here is a list of the strongest AI neural networks for LeelaChessZero.]) If you'd like to contribute your GPUs/CPUs to Leela improvement, you can download the latest client. Here is a tool to get your Leela ratio, and here is the process for getting it going on a Windows PC.

Once you've gotten Lc0 set up, you can also try out Anti-Fish, the neural network used to make Stockfish stronger, or Leelenstein. Use the Lc0 engine executable, then use the AntiFish or Leelenstein nn file as the weights file. You can also try LeelaFish, which uses the Lc0 AI with the help of an AB engine, like Stockfish, to find tactical shots. Allie is new and promising.
Chess engine rankings and ratings lists
Computer Chess Ratings List (CCRL)Chess Engine Grand Testing (CEGT), and IPManChess
Opening books for engine testing
Stefan Pohl has good opening books. Here are some of the chess engine opening books we like.
Endgame tablebase (EGTBs) downloads
Olympus, or
Free computer chess GUIs
Arena chess GUIBanksia chess GUI"ChessGUI"Cute Chess GUINibbler - the chess GUI made specifically for Lc0,  and Zentropy. We have backups of those programs and more chess GUIs here.
Free computer chess utilities
Bayesian Elo calculatorOrdo ratings calculator,  and PGN Scanner 0.92. We have backups of those programs and more chess utilities here.
Tactical test suites
How good is your engine at solving tactical or endgame problems? Use a test suite to find out. We have the Arasan Chess test suite, the Eigenmann test suite, the AH Tactics suite and AH Endgame test suite, and others for download here.
Chess forums
TalkChess.comLc0 DiscordStockfish Discord


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