Sunfish4 Engine & AI Support

Equipped with the sharp reading of the powerful engine "Sunfish4". The "AI Support (Auto-move)" feature helps you when you are stuck, becoming a strong ally for review and learning.

Real-time Evaluation Graph

Displays the situation (evaluation) graph and score in real-time during the match. Moves that significantly change the situation are highlighted, so you can instantly see points for review.

Precise Visualization of Thinking Time

Displays thinking time for each move in the game record. Highlights long deliberations in red (top 5%) or yellow (top 15%). You can objectively analyze your reading rhythm.

Advanced Game Review

Instantly jump to any position from the game record. With playback, step-back, and step-forward controls, post-match review is smooth.

Online Matches & Ranking System

Play real-time matches with players nationwide. Equipped with a ranking function based on win/loss data.

Flexible Lv.1–Lv.20 Adjustment

Select CPU strength from 20 levels. Features like side selection (Sente/Gote) and UNDO support your free playing style.

Support & Engine

For bug reports or feedback, contact us at:

[email protected]

Engine: Sunfish4 (MIT License)
Optimized for maximized board view.

Privacy Policy

We prioritize protecting your privacy.

Online Features: Temporary identifiers are used for matchmaking and rankings.
Personal Data: We do not collect personal information such as names or email addresses.
Offline Support: CPU matches and local 2-player matches operate completely offline and do not transmit data.
Advertisements: (For Lite version users) This app uses third-party advertising services (Google AdMob). Ad providers may use information such as device identifiers (e.g., IDFA) to deliver personalized advertisements. You can opt-out of this data collection by adjusting your device's tracking settings.

Shogi Lab

Ultimate Match & Analysis Features