ChessDB
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Available in: Builder, Library, Practice, Tools
ChessDB is an online opening database that provides detailed move statistics and engine evaluations across millions of games. Within the Repertoire Builder, the ChessDB card displays data for the current board position, letting you instantly see the strongest continuations, success rates, and evaluation trends. This allows you to compare your repertoire choices against broad statistical and engine-backed data, highlight key alternatives, and refine your lines directly inside the Builder.
For the current position, this section displays:
- ◦ Move: The next move from ChessDB, highlighted in green if it already exists in your opened item.
- ◦ Score: Engine evaluation returned by ChessDB; positive means advantage for the side to move.
- ◦ Win Rate: (If shown) a derived metric in your UI — ChessDB doesn’t natively return win rate; teams often map engine score to win probability or pull it from another source.
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Rank: ChessDB’s move-quality code 0/1/2 (0 = bad
?, 1 = good*, 2 = best!), not an ordinal popularity rank. -
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Note: Displays additional move information. For normal positions, the format is
symbol (Known replies – Good replies), e.g.! (22–00), where the numbers show how many replies are known in the database and how many are considered strong. For tablebase positions, the format is(Outcome – Step), e.g.W–17, meaning a theoretical win for the side to move in 17 moves.
You can click on any move to add it directly to your opened item, or right-click to add the move together with its associated data fields (Score, Win Rate, Rank, and Note) as a comment for quick reference.
This feature helps you:
- + Analyze positions using large-scale ChessDB data and real engine evaluations
- + Identify high-performance moves supported by both statistics and evaluation
- + Instantly add moves from ChessDB to your repertoire or study item
- + Refine your opening preparation using objective, data-driven feedback