Using Stockfish Chess AI in Unity

Question

Good Morning. I am trying to implement Stockfish to a Unity chess game, Ive been told that the best way is using Spawn.Process Does anyone know of existing code I can look at and take as reference?

Are different Gamestates the best way to communicate with AI?

Thanks!

Answer 1

If you can represent your game state in Forsyth-Edwards Notation and read Algebraic Notation to advance your board state, this should work:

string GetBestMove(string forsythEdwardsNotationString){
    var p = new System.Diagnostics.Process();
    p.StartInfo.FileName = "stockfishExecutable";
    p.StartInfo.UseShellExecute = false;
    p.StartInfo.RedirectStandardInput = true;
    p.StartInfo.RedirectStandardOutput = true;
    p.Start();  
    string setupString = "position fen "+forsythEdwardsNotationString;
    p.StandardInput.WriteLine(setupString);
    
    // Process for 5 seconds
    string processString = "go movetime 5000";
    
    // Process 20 deep
    // string processString = "go depth 20";

    p.StandardInput.WriteLine(processString);
    
    string bestMoveInAlgebraicNotation = p.StandardOutput.ReadLine();

    p.Close();

    return bestMoveInAlgebraicNotation;
}