Claude-built open-source chess sim Scacelith features a pure-code OpenGL 4.6 3D engine
darkcenobyte_1 · reddit · 2026-10-05
- A user had Claude build Scacelith, an open-source (GPL-3.0) chess simulator with a custom C++ 3D graphics engine written purely in code on OpenGL 4.6—no art assets.
- Features: offline play vs Stockfish 19; OTB-tournament clock pressure mode; a coaching mode with multilingual TTS from a small local AI; a Rust dedicated server with MFA multiplayer supporting tens of thousands of concurrent games, plus direct-IP connections.
- The author calls it the most impressive thing they've built with Claude, showcasing what Opus 5.5 can deliver in weeks.
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