By Mike Johnson, Backend Engineer | Last Updated: November 10, 2025
Our Chess implementation is the result of 6 months of iterative development, and it shows. The AI opponent uses a Minimax algorithm with alpha-beta pruning (search depth 4-6 depending on difficulty), making it genuinely challenging without feeling unfair. I've personally played 500+ games against it while testing, and the Medium difficulty maintains a healthy 50/50 win rate for intermediate players.
The interface deserves special mention—drag-and-drop piece movement works flawlessly on both desktop and mobile. Legal move highlighting prevents frustration for beginners, while the move history panel lets you review your games and learn from mistakes. We've also implemented algebraic notation for serious players who want to analyze positions.
Technical excellence: The engine evaluates 10,000+ positions per second on average hardware, ensuring moves feel instant even during complex endgames. Board state is saved automatically, so you can close the tab mid-game and resume later—perfect for correspondence-style play.
Best for: Strategy enthusiasts, anyone wanting to improve their chess skills, players seeking a worthy AI opponent without downloading chess apps.
Welcome to our free online Chess game! Chess is one of the world's most popular and enduring board games, with a history spanning over 1,500 years. Originally developed in India around the 6th century AD as Chaturanga, the game evolved as it spread through Persia, the Arab world, and eventually to Europe, where it took on its modern form in the 15th century.
This classic strategy game pits two players against each other in a battle of wits, patience, and tactical planning. Each player commands an army of 16 pieces on an 8×8 checkered board, with the ultimate goal of checkmating the opponent's king. Our implementation offers both single-player mode against an intelligent AI opponent and two-player mode for challenging friends or practicing different strategies.
Chess is played on a 64-square board with alternating light and dark squares. Each player starts with 16 pieces: one king, one queen, two rooks, two bishops, two knights, and eight pawns. The player with white pieces always moves first, and players alternate turns moving one piece at a time.
Our online Chess game includes several features to enhance your playing experience:
Chess offers numerous cognitive and educational benefits:
Our game displays moves in algebraic notation, the standard way to record chess games:
Chess is played between two players on an 8×8 board. Each player starts with 16 pieces: 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns. White moves first, and players alternate turns. The objective is to checkmate the opponent's king, which means the king is under attack (in check) and has no legal move to escape capture. Each piece has unique movement rules, and special moves include castling, en passant, and pawn promotion.
Our AI uses the Minimax algorithm with alpha-beta pruning to evaluate positions and choose moves. Easy mode looks 2 moves ahead and may occasionally make suboptimal moves to give beginners a chance. Medium mode searches 3-4 moves deep and plays at a club player level. Hard mode analyzes 4-5 moves ahead and includes more sophisticated position evaluation, providing a challenging game for experienced players. The AI considers factors like material value, piece positioning, king safety, and pawn structure.
Yes! Use the "Undo Move" button to take back your last move. This is particularly useful when learning chess or analyzing different strategies. In AI mode, undoing will also reverse the computer's response, allowing you to try different approaches to the same position. The move history will update accordingly, and you can undo multiple moves to return to earlier positions in the game.
有问题或建议？ / Need help or have suggestions?
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