♟ Chesskit Analyzer — Chrome Extension

Finish a game on Chess.com. Click one button. Your game is already open in Chesskit, analyzed and ready.

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The problem

Chess.com only lets you do a full game review once per day (free tier). So most players use Chesskit.org — a free, unlimited analysis tool powered by Stockfish 17.

The problem? After every game you have to:

1. Open a new tab
2. Go to chesskit.org
3. Click "Load Game"
4. Type your username
5. Wait for games to load
6. Click your latest game

That's 6 steps and ~30 seconds of friction, every single game.

The solution

This extension adds a single "Analyze in Chesskit" button to the Chess.com end-of-game modal. One click later, Chesskit is open with your username filled in and the latest game already selected.

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Demo

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Installation

1. Download the latest chesskit-extension.zip from Releases
2. Unzip the file
3. Open Chrome → chrome://extensions/
4. Enable Developer mode (top-right toggle)
5. Click Load unpacked → select the unzipped folder
6. Play a game on Chess.com — the blue button appears when it ends ✓

Optional: Click the extension icon in Chrome's toolbar to manually set your username (useful as a fallback).

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How it works

content_chess.js runs on chess.com and:

• Watches for the end-of-game modal using a MutationObserver
• Detects it by looking for text like "¡Has Ganado!" / "You Won!" — no fragile CSS class selectors
• Reads your username from [data-test-element="user-tagline-username"] inside #board-layout-player-bottom
• Injects the blue button and stores your username in chrome.storage.local

content_chesskit.js runs on chesskit.org and:

• Reads the stored username from chrome.storage.local
• Clicks the "Load Game" button automatically
• Types your username into the input field using React-compatible events
• Clicks the autocomplete suggestion
• Waits for li[data-sentry-component="GameItem"] elements to appear
• Clicks the first one (most recent game)

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File structure

chesskit-extension/
├── manifest.json          # Chrome Extension Manifest v3
├── content_chess.js       # Injected on chess.com
├── content_chesskit.js    # Injected on chesskit.org
├── popup.html             # Extension popup (username config)
├── popup.js               # Popup logic
└── icon.png               # Extension icon

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Permissions

Permission	Why
storage	Save your Chess.com username locally
tabs	Open Chesskit in a new tab

No network requests. No external APIs. No tracking.

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Contributing

PRs welcome. The most likely things to break:

• Chess.com changes their DOM structure → update selectors in content_chess.js
• Chesskit changes their component names → update content_chesskit.js

If something breaks, open an issue with a screenshot of the DevTools Elements panel on the affected element.

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License

MIT — do whatever you want with it.

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Not affiliated with Chess.com or Chesskit.org.