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The strongest 2021 chess programs FOR FREE - you don't need to pay anything!
These are the best and the strongest 2021 chess programs, they are totally free but you need a graphical interfact to make them work, such as Fritz (Windows), the free Arena (Windows and Linux), SCiD or Droidfish (Android). Any of these programs (chess engines) must be installed on said interfaces.
Cfish - Machines rapid competition and analysis (updated)
CorChess - Correspondence chess or machines rapid competition
Raubfisch - Machines rapid competition
SugaR - Machines rapid competition and correspondence chess (updated)
Stockfish Polyglot - Machines rapid competition and analysis
CF_EXT - Machines rapid competition
BrainLearn - Machines rapid competition
How to install these programs on Fritz:
With the change of the engines to NNUE it's crucial to have the requested net and place it in the same folder with them if the net is not embedded in these programs (binaries less than 10 MB).
The Android binaries are already compiled with the network embedded so there's no need to put the network together.