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While tools like this exist, they highlight a major issue for competitive web apps: if the calculation happens client-side, the user has ultimate control. It’s a reminder that for fair play, sensitive logic should always stay server-side.

On the other edge, you have that destroy the spirit of the game. Using an engine via a script is no different than hiding a phone in your lap during a tournament. You gain fake ELO, but you lose the joy of improvement.

: Since these scripts are often hosted on open repositories like GreasyFork or GitHub, they can contain "malware". A poorly vetted script could steal your login cookies or track your browsing data. Site Stability

Hide your rating or sensitive information while broadcasting to avoid "stream sniping." 2. Workflow & Productivity Tools

: These include "Move Guides" that suggest moves, "Square Labels" for algebraic notation, or "Chess Helpers" that highlight captures and protections.

Simplifies downloading your game history for offline archiving. ⚠️ Important Risks & Ethics

Ever wanted to customize your chess experience? Here is the skeleton of a Tampermonkey script that highlights the center squares on any chess board.