Improved userscript: top 3 moves & threats, persistent settings, debounce/throttle, safer engine lifecycle, promotion handling, better board detection, min/max delay, and real-time evaluation bar. Now using updated Stockfish from a new resource.
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1. What this script does
This is for Chess.com that integrates Stockfish to analyze games in real-time. Key features:
Dynamic Time Management: Adjusts thinking time based on opening/middlegame/endgame.
Stockfish Settings: Configurable threads and hash.
Move Classification: Labels moves as Best, Excellent, Good, Mistake, Blunder, etc., using centipawn loss.
Highlighting: Shows top moves, threats, and PV (principal variation) visually on the board.
Auto-Move: Can move pieces automatically if enabled.
GUI: Provides a slider for depth, inputs for threads/hash, and buttons for reload/analyze.
2. Technical Strengths
Modern Stockfish Integration: Uses CDN for web worker—avoids local file dependency.
Robust board detection: Checks multiple selectors, works on standard and flipped boards.
Dynamic evaluation: Uses centipawn thresholds and mate detection for move classification.
Smart engine restart: Safely reloads Stockfish if threads/hash are changed.
Throttling/debouncing: Prevents excessive engine calls and ensures smooth performance.
Visual feedback: Highlights moves and threats for intuitive analysis.
3. Configurations
Threads = 4, Hash = 256 MB:
Threads: Uses 4 cores; fine for most modern quad-core CPUs.
Hash: 256 MB is enough for light to medium analysis but will recalc positions for very deep searches.
These values are safe for casual/medium analysis, but if you want longer deeper analysis, increasing hash (e.g., 1024 MB) would improve performance.
Depth = 18:
Reasonably deep; engines can calculate strong moves, especially for level 8–12 analysis.
Combined with Stockfish worker, this should be responsive.
Dynamic delays (1–3s):
Makes the bot look more human-like.
Shorter times for early moves, longer times for complex middlegame positions.
