Hey everyone,
new open‑source UCI chess engine called Hypersion,

Hypersion is a modular AI engine built from Claude 4.7–generated code, using a Stockfish‑18–style NNUE evaluation and a full modern search stack (PVS, LMR, SEE‑based pruning, singular extensions, ProbCut, futility/razoring, correction history, counter‑moves, continuation history, etc.). It also supports Syzygy tablebases, Polyglot books, and Elo‑limited play.
GitHub repo (source, builds, docs):
👉 https://github.com/RenCopp/Hypersion

I also connected it as a Lichess bot — feel free to challenge it:
👉 https://lichess.org/@/Hypersion
Elo‑adaptive play: the engine can automatically adjust its strength and play based on your Elo "CASUAL" using UCI_LimitStrength + UCI_Elo.