Command Center
Your chess mission control.
Import games from TWIC — the world's largest free chess game archive — with a single click. New issues appear weekly with thousands of real FIDE-rated OTB games. Track your database size, monitor imports, and stay current with the latest tournaments.
- One-click TWIC import — new issues every week
- Real OTB tournament games, not online blitz
- Database grows as you import — unlimited, stored locally
- All data lives on your Mac — no cloud, no account
Intelligence Database
Filter. Search. Study any game.
Browse your entire game collection. Filter by player name, ELO range, ECO code, event, or TWIC issue. Toggle "Annotated" to find games with your comments, or "My Study" to see games you've analyzed. Click any row to open it in the analysis board.
- Filter by player, rating, opening (ECO), event
- Opening family filters — Sicilian, Ruy Lopez, Queen's Gambit, etc.
- Standard open PGN format — no proprietary database lock-in
- Unlimited games — your database grows as you import
Deep Analysis Board
Annotate like a grandmaster.
Full Stockfish engine analysis with multi-PV top 3 lines and evaluation bar. Draw green arrows, pink arrows, and yellow circles on the board. Add text notes to any position — they're embedded in standard PGN so you can export your annotated game anytime.
- Stockfish engine — top 3 lines with centipawn evaluation
- Draw arrows and highlight squares (right-click / shift+click)
- Inline text annotations
- Download annotated PGN — your analysis is never locked in
- Save to repertoire folders or clip as flashcard
Repertoire & Flashcards
Build your opening prep system.
Organize analyzed games into custom folders. Found a critical position? Clip it as a flashcard — the position is saved with your arrows, annotations, and tags. Review your flashcard collection later to drill key positions. Export entire folders as PGN to share or back up.
- Custom folders — organize by opening, opponent, theme
- Flashcard clips — save positions with arrows and notes
- Mini chessboard previews for each saved position
- Import/export folders as PGN — always portable
OTB Tournament Prep
Know what's trending at your rating.
Neither Lichess nor Chess.com has a database of real FIDE OTB tournament games. macbase does. See which openings have the best win rates at your ELO bracket. Track popularity trends across recent TWIC issues.
Bridge the online-OTB gap: You're 2000 on Lichess but have no idea what FIDE ELO that maps to? Compare your games to 1700, 1800, 1900 FIDE-rated games — see what openings they play and how your prep stacks up before you sit down at the board.
- Win rates by ELO — filter 1700-2000, 2000-2200, 2200-2500, 2500+
- Best openings as White (1.e4 / 1.d4) and as Black
- Popularity trends — which openings are rising or falling
- Data from real FIDE-rated OTB games, not online ratings
