Instantly visualize chess games from PGN notation. A free, browser-based chess board viewer to navigate, analyze, and review your chess matches easily.
AI Generation Prompt
Technical Specification: Browser-Based Chess PGN Viewer
Overview
A clean, professional-grade, browser-based tool to render and navigate chess games provided in PGN format. The application is designed for rapid review and tactical analysis, featuring a light-mode aesthetic, responsive layout, and zero-server dependency.
Core Technical Constraints
- Single File Architecture: Entirely self-contained (HTML, CSS, JS). No external build steps or frameworks.
- Storage Restrictions: NO localStorage, sessionStorage, cookies, or indexedDB. All state is maintained in volatile memory.
- Performance: Vanilla JavaScript only. Use highly optimized DOM manipulation or CSS transformations to ensure smooth board transitions.
- Sandboxed Environment: The tool must be functional within a
null-originiframe context.
UI/UX Design System
- Color Palette: Professional "SaaS Light" aesthetic.
- Background: Off-white (
#F8F9FA) - Primary Accent: Navy/Slate blue for UI buttons (
#2D3748) - Board Colors: Cream (
#F0D9B5) and Muted Sage (#B58863) for squares. - Text: Dark Charcoal (
#1A202C)
- Background: Off-white (
- Layout:
- Header: Clean title with a brief "Paste your PGN" instruction.
- Two-Column View (Desktop): Board on the left (60% width), Move History/Metadata on the right (40% width).
- Stacked View (Mobile): Board on top, Move History below, switching via media queries.
- Interactions:
- Smooth transitions when moving pieces.
- Hover effects on pieces.
- High-contrast highlight for the current active square.
Feature Set
- PGN Parser: A robust parser to convert PGN text strings into an array of board states (FEN-based or Move-based).
- Dynamic Board Rendering: SVG-based chess pieces to ensure crisp resolution on any device. Pieces must be interactive yet intuitive.
- Navigation Controls: Play/Pause (auto-play), Next Move, Previous Move, First Move, Last Move controls.
- Metadata Display: Automatic extraction and display of Game Headers (e.g., White, Black, Result, Date, Event).
- Responsive Move List: A scrollable list of moves that auto-scrolls to keep the current move in view.
Implementation Strategy
- Piece Representation: Use standard Unicode chess symbols or inline SVG sprites. Inline SVGs are preferred for aesthetic control and styling.
- State Management: Use a JavaScript object to maintain the
currentMoveIndex. When the index changes, re-render the board by applying the moves sequentially from index 0. - Formatting: Ensure all UI elements use system fonts (e.g., Inter, system-ui) for a clean, modern look. Use CSS Flexbox/Grid for layout stability.
- Accessibility: All controls should be keyboard-navigable (e.g., Left/Right arrow keys for navigation).
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Files being used
Frequently Asked Questions
Everything you need to know about using this application.
How do I use the PGN viewer?
Copy your PGN (Portable Game Notation) text from any chess website or file and paste it directly into the input field on the page. The application will immediately parse the algebraic notation and render the initial board state. Once the board is rendered, you can use the interactive playback controls below the board to navigate move-by-move, jump to the very beginning, or skip to the final position of the game.
Does this tool save my chess games?
This application operates with a strict privacy-first architecture, meaning it never communicates with an external server, nor does it store any data in your browser's local storage or cookies. Everything happens entirely within your device's volatile RAM. Because of this design, all data is automatically purged the moment you refresh the page or close your browser tab. We recommend manually saving any notes or move-list alterations you make to a separate text file or document if you intend to reference them later.
Is this PGN viewer compatible with all chess variations?
This tool is purpose-built to support standard 8x8 chess games utilizing standard algebraic notation. It handles essential move types including castling, en passant, promotion, and check/checkmate detection accurately. While it is optimized for standard chess, it may not support non-standard chess variants or complex extended algebraic notations (X-FEN). It is intended as a lightweight, highly reliable study companion for reviewing standard chess matches on any device.
Can I analyze games directly in the browser?
Yes, the viewer provides a high-fidelity, interactive visual representation of the board that updates in real-time as you navigate through the move list. This allows you to replay the game sequence, study tactical themes, and observe how the position evolves at every step. By visualizing the board positions dynamically, you can identify blunders, review opening lines, and verify tactical sequences without needing to install heavy software. It serves as a perfect, low-friction tool for quick post-game analysis on desktop or mobile devices.
