Openingtree (with Stockfish Integration)

Fork of openingtree.com with integrated Stockfish 17.1 engine analysis.

This project downloads chess games in form of a PGN from any source, applies specified filters and constructs an opening tree. The tree is visualized on a chessboard with win percentages and other statistics.

New Features: Stockfish Integration

This fork adds Lichess-style Stockfish engine analysis:

• Evaluation Bar - Vertical bar showing position assessment (like Lichess)
• Top Move Suggestions - Display top 3 best moves with evaluations in algebraic notation
• Interactive Analysis - Click moves to play them, hover to highlight on board
• Board Flip Support - Evaluation bar correctly flips with board orientation

Screenshots

When engine is enabled, you'll see:

• Evaluation bar on the left side of the board
• Engine analysis panel below the board showing best lines

Architecture diagram

This does not correlate one to one with the code modules but the interactions at a high level are depicted accurately.

Run locally

npm install --legacy-peer-deps
NODE_OPTIONS=--openssl-legacy-provider npm start

starts a server on port 3000

Build for production

NODE_OPTIONS=--openssl-legacy-provider npm run build

Attribution

This project uses code and concepts from:

• OpeningTree - GPL-3.0
• Lichess - AGPL-3.0 (evaluation concepts)
• Stockfish.js - GPL-3.0
• Stockfish - GPL-3.0

See ATTRIBUTION.md for full details.

License

GPL-3.0 (same as original OpeningTree)