Use stockfish chess engine in your React Native application.

npm install @loloof64/react-native-stockfish

import {
  useStockfish
} from '@loloof64/react-native-stockfish';

// ...

const [stockfishOutput, setStockfishOutput] = useState('');
  const {stockfishLoop, stopStockfish, sendCommandToStockfish} = useStockfish({
    onOutput: useCallback((output: string) => {
      setStockfishOutput((prev) => prev + output);
    }, []),
    onError: useCallback((error: string) => {
      setStockfishOutput((prev) => `${prev}\n###Err\n${error}\n###`);
    }, [])
  });

// ...

stockfishLoop();

// ...

sendCommandToStockfish('go movetime 1000');

// ...

stopStockfish();

Get started with the project:

$ yarn

Run the example app on iOS:

$ yarn example ios

Run the example app on Android:

$ yarn example android

See the contributing guide to learn how to contribute to the repository and the development workflow.

If you need to upgrade Stockfish source files, create a folder stockfish inside cpp folder, copy the src folder from the stockfish sources into the new stockfish folder.

In stockfish/src/main.cpp replace the name of function main with stockfish_core.

Also you need to make some more adaptive works :

• copy the cpp/fixes folder inside the cpp/stockfish folder

• replace all calls to cout << #SomeContent# << endl by fakeout << #SomeContent# << fakeendl (And ajust also calls to cout.rdbuf() by fakeout.rdbuf()) But do not replace calls to sync_cout.

• copy folder cpp/fixes inside the stockfish folder

• add include to ../fixes/fixes.h in all related files (and adjust the include path accordingly)

• proceed accordingly for cin : replace by fakein

• and the same for cerr: replace by fakeerr

• in misc.h replace

#define sync_cout std::cout << IO_LOCK
#define sync_endl std::endl << IO_UNLOCK

with

#define sync_cout fakeout << IO_LOCK
#define sync_endl fakeendl << IO_UNLOCK

and include ../../fixes/fixes.h

In file CMakeLists.txt replace the names of big and small NNUE by the ones you can find in file cpp/stockfish/src/evaluate.h. Also replace those values in the file ReactNativeStockfish.podspec, as well as in the file android/CMakeLists.txt.

MIT

Made with create-react-native-library

Using sources of Stockfish 17.