Opening Move Tree with Chessboard

• Colors: Each arc represents an ECO category with consistent coloring:
• Red: ECO A (Flank openings / e4 openings)
• Blue: ECO B (Semi-open / d4 openings)
• Green: ECO C (Open games / Nf3 openings)
• Purple: ECO D (Closed games / c4 and other openings)
• Orange: ECO E (Indian defenses / uncommon and irregular openings)
• Arc Size: Proportional to number of games playing the move
• Interactions: Click on an arc to filter by that opening type
• Chessboard: Shows the board position based on selected moves