What's the best Android app for serious chess practice without needing constant internet?

Chess Online & Offline is a strong contender for players seeking dedicated practice away from the unpredictability of online matches. Its primary strength lies in a robust offline mode featuring a tiered system of AI opponents. These bots are noted for their efficient and challenging play, providing a consistent training environment that can help users develop critical thinking and strategic depth. For specific skill development, the app includes a puzzle section where users must find the best move in a given position. While some user reviews indicate a minor interface imperfection—suggesting clearer labeling for which side is to move in these puzzles—the training utility is substantial. The app also supports online play for when connectivity is available, creating a flexible hybrid experience. An 'auto move showing' concept, where the app can display potential moves, is highlighted in user feedback as a helpful learning tool for newer players. The clean, ad-minimized interface reported by users allows for focused sessions, making it suitable for everything from a quick puzzle during a commute to a long, analytical game against a tough computer opponent. Its high user rating stems from this reliable, feature-complete approach that prioritizes the core chess experience over peripheral distractions.