CodeClash Adds a Local-LLM 'Ghost Racer' to Its 1v1 Codeforces Duels

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CodeClash is a real-time competitive programming arena where two players, matched by Elo, race to get the first Accepted verdict on the same Codeforces problem. The platform offers ranked matchmaking, private challenge rooms, an embedded multi-language IDE, live verdict tracking, and a global leaderboard. For the Hacktoberfest Open-Source AI Challenge, its developer added a Ghost Racer, an open-weight AI agent that runs locally and competes against a player on the same problem without needing a human opponent. The agent attempts solutions, fails and retries on sample tests, and either wins or drops out. Verdicts are drawn from Codeforces' official submission data rather than a custom judge, and the backend runs on FastAPI with Neon PostgreSQL.

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