Chess Online & Offline is a feature-rich chess application that caters to both casual players and serious enthusiasts. The app allows users to engage in online matches with opponents worldwide, offering various time-limited game modes such as Classic, Blitz, and Bullet. For offline practice, players can challenge a computer opponent with adjustable difficulty levels ranging from beginner to expert.

Beyond standard gameplay, the app provides an immersive experience through advanced haptics, sound effects, and customizable chessboard styles. Players can also solve over 300,000 tactics puzzles to sharpen their skills while enjoying classical music. With global and country-based rankings, detailed game statistics, and helpful move markers, this app ensures a comprehensive and enjoyable chess experience.

The app boasts an impressive array of features designed to enhance the chess-playing experience. Users can choose from 21 unique chessboard styles and 16 sets of chess pieces, allowing for personalization. During gameplay, helpful markers highlight legal moves, last moves, possible captures, and check situations, aiding strategic decision-making.

Advanced functionalities include premove options to save time, game history browsing, and recognition of over 3000 openings with variations. The app employs the Arpad Elo formula to calculate player rankings and computer strength accurately. It also supports light and dark themes, Material Design 3 interface, and utilizes Google's Firebase Firestore for reliable performance, ensuring smooth gameplay for thousands of simultaneous users.

Rule authenticity and flexibility are crucial elements in any board game app, especially in chess where the rules have been refined over centuries. Checkmate ensures that every move adheres strictly to official chess regulations while offering players the ability to customize certain aspects of play.

The app provides multiple gameplay modes including Classic, Blitz, and Bullet formats, each with varying time controls. This allows players to experience different styles of chess while maintaining the integrity of traditional rules. Additionally, features like premove and legal move indicators enhance the authenticity of the gameplay.

Players can choose from 21 chessboard styles and 16 sets of chess pieces, giving them the freedom to personalize their gaming environment without compromising rule accuracy. The inclusion of over 3000 game openings with variations further demonstrates the app's commitment to authentic chess experiences.

This combination of strict rule adherence and customizable options creates a flexible yet genuine chess experience that appeals to both casual players and serious enthusiasts alike.

The quality of AI opponents is a defining factor in offline chess apps, determining how realistic and challenging the computer-controlled games feel. Checkmate offers an advanced AI system with 16 distinct difficulty levels, ranging from beginner (600 ELO) to expert (2100 ELO), ensuring players of all skill levels can find appropriate challenges.

The AI utilizes the Arpad Elo formula for calculating strength, providing increasingly sophisticated gameplay as users progress through the difficulty settings. This scientific approach guarantees that each level presents unique strategic challenges while maintaining balanced competition.

Offline practice mode includes helpful features such as move suggestions, threat detection, and tactical markers, which assist players in improving their skills against the computer. These tools work in tandem with the AI to create a comprehensive learning experience.

Whether you're new to chess or an experienced player looking to refine your strategies, the app's sophisticated AI opponent system delivers consistently engaging and educational matches across all difficulty levels.