YouTube video by Dr. Can's Chess Clinic

Which chess engine is the best in the world? The answer won't surprise you. But here's why your favorite chess machine is best.

It's mostly the same, but with more error handling. There's much that can be done to improve performance, but I don't think UCI messages are very large, so this is probably sufficient. use std::io::{self, BufRead}; use std::process::{self, ChildStdin, ChildStdout, ExitCode, Stdio}; struct ChessEngine { engine: process::Child, engine_stdin: ChildStdin, engine_stdout: ChildStdout, } impl ChessEngine { fn new() -> io::Result<Self> { let mut engine = process::Command::new("/usr/games/stockfish") .stdin(Stdio::piped()) .stdout(Stdio::piped()) .stderr(Stdio::null()) .spawn()?; let engine_stdin = engine.stdin.take().unwrap(); let engine_stdout = engine.stdout.take().unwrap(); Ok(Self { engine, engine_stdin, engine_stdout, }) } fn write_stdout(engine_stdout: ChildStdout) -> io::Result<()> { for line in io::BufReader::new(engine_stdout).lines() { let line = line?; let line = line.replace("foo", "bar"); println!("{line}"); } Ok(()) } fn read_stdin(mut engine_stdin: ChildStdin) -> io::Result<()> { for line in io::stdin().lines() { let line = line?; let line = line.replace("foo", "bar"); use io::Write; writeln!(engine_stdin, "{line}")?; engine_stdin.flush()?; } Ok(()) } fn run(mut self) -> io::Result<process::ExitStatus> { std::thread::scope(|scope| { let stdout_thread = scope.spawn(|| Self::write_stdout(self.engine_stdout)); let stdin_thread = scope.spawn(|| Self::read_stdin(self.engine_stdin)); let exit = self.engine.wait()?; stdout_thread.join().unwrap()?; stdin_thread.join().unwrap()?; Ok(exit) }) } } fn main() -> ExitCode { let chess_engine = ChessEngine::new().unwrap(); let exit = chess_engine.run().unwrap(); ExitCode::from(exit.code().unwrap_or(0).try_into().unwrap_or(1)) }

YouTube video by GMHikaru

kasumi01 (1500?) played Stockfish level 4 in a casual Correspondence game of chess. kasumi01 won by checkmate after 48 moves. Click to replay, analyse, and discuss the game!