Black & White Go vs Doctor Go

Black & White Go — the strongest Go AI in your pocket. Powered by KataGo, the world's strongest open-source Go engine, built right into the app. Play and review games anytime, anywhere — fully offline. STRICTLY FAIR GAMES • 15 difficulty levels — from beginner to strong amateur • 9×9, 13×13 and 19×19 boards • Even games, nigiri, 2–9 stone handicap, free handicap placement • Pass, undo and resign supported • Games are saved automatically — resume anytime PLAY YOUR WAY • Play Black or White against the AI • Play face-to-face with a friend • Watch AI vs AI games and learn AI REVIEW — IMPROVE EVERY GAME • Full-game win-rate graph at a glance • Automatic mistake marking: blunder / mistake / inaccuracy • At every marked move, see the AI's recommended play on the board • Choose analysis depth (Fast / Standard / Thorough) — remembered for next time • Tap the graph to jump to any move, or step 10 moves at a time POSITION ANALYSIS • Estimate territory and influence while you play Available in Korean and English.

Doctor Go is the friendly way to learn the ancient game of Go (Baduk / Weiqi) on your phone or tablet — interactive lessons that teach you the rules and the most important shapes one step at a time. • 30 chapter-based lessons — every lesson has a board example and an interactive move with instant feedback • Searchable glossary of 51 Go terms — atari, ponnuki, ko, ladder, eye, joseki, sente, miai, tesuji and more • 211 puzzles — 131 life-and-death and liberty exercises, plus ladder, endgame and capturing-race problems • Four AI tiers — Beginner / Easy / Medium / Strong, MCTS-based with heuristics • 9·13·19 line boards · Korean / Japanese / Chinese rules · 2–9 stone handicap • OS-native leaderboard and achievements via Game Center • Friendly board UI — last-move marker, optional liberty / atari hints, score-territory preview, undo, full game replay No sign-up. No ads. No tracking. No in-app purchases.