🎮 How to play:

• Choose your side: ♔ (White) or ♚ (Black)
• Adjust difficulty: From level 1 (easy) to 6 (Stockfish expert)
• Make moves: Drag and drop pieces
• Pawn promotion: When a pawn reaches the end, choose promotion piece

🔄 Top controls:

• ℹ️ Game information
• ↻ Flip board
• ↶ Undo move
• ↺ New game

💾 Bottom controls:

• 💾 Save game (PGN)
• 📂 Load saved game
• ★ Immortal Game with comments
• ⏮ ◀ ▶ ⏭ Navigate through moves

🏆 Chess Variants:

• Standard (S): Traditional chess with standard starting position
• Fischer Random (F): Also known as Chess960. The back rank pieces are randomly arranged following specific rules:
• Two bishops must be on opposite-colored squares
• The king must be between the two rooks
• There are 960 possible starting positions
• Castling rules adapt to the random setup
• Eliminates opening theory memorization

🤖 Chess Engine Details

Levels 1-5: Custom-built engine using an optimized Minimax algorithm with Alpha-Beta pruning. Search depth and decision quality increase with each level:

• Level 1: Very easy - Searches 1 move ahead, suitable for beginners
• Level 2: Easy - Searches 2 moves ahead, basic tactics
• Level 3: Medium - Searches 3 moves ahead, decent positional play
• Level 4: Hard - Searches 4 moves ahead, good tactical awareness
• Level 5: Very Hard - Searches 5 moves ahead, strong chess understanding

Level 6: Full Stockfish engine - The world's strongest chess engine. Uses advanced algorithms, neural networks, and searches 20+ moves ahead. Professional-level play that can challenge grandmasters.

Note: Level 6 requires an internet connection to load the Stockfish engine from CDN.