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'''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.
'''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 card displays the following fields:
For the current position, this section displays:


<ul style="list-style:none; padding-left:0.5em; margin:0;">
<ul style="list-style:none; padding-left:0.5em; margin:0;">
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Move:</b> The next move played in the ChessDB database, highlighted in <span style="color:green; font-weight:bold;">green</span> if it already exists in your opened item</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Move:</b> The next move from ChessDB, highlighted in <span style="color:green; font-weight:bold;">green</span> if it already exists in your opened item.</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Score:</b> The average engine evaluation from ChessDB for that move</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Score:</b> Engine evaluation returned by ChessDB; positive means advantage for the side to move.</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Win Rate:</b> The overall win percentage for the side to move, based on aggregated game results</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Win Rate:</b> (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.</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Rank:</b> The move’s relative popularity within the position, ordered by frequency or success rate</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Rank:</b> ChessDB’s move-quality code <b>0/1/2</b> (0 = bad <code>?</code>, 1 = good <code>*</code>, 2 = best <code>!</code>), not an ordinal popularity rank.</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Note:</b> Any additional commentary or evaluation details provided by ChessDB</li>
   <li><span style="display:inline-block; width:0.9em; text-align:center; font-weight:bold;">◦</span> <b>Note:</b> For normal positions: the symbol (<code>!</code>/<code>*</code>/<code>?</code>) plus <b>(Known replies – Good replies)</b>, e.g. <code>! (22–00)</code>. For tablebase positions: <b>(Outcome – Step)</b>, e.g. <code>W–17</code>.</li>
</ul>
</ul>



Revision as of 02:10, 9 October 2025

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.
  • Rank: ChessDB’s move-quality code 0/1/2 (0 = bad ?, 1 = good *, 2 = best !), not an ordinal popularity rank.
  • Note: For normal positions: the symbol (!/*/?) plus (Known replies – Good replies), e.g. ! (22–00). For tablebase positions: (Outcome – Step), e.g. W–17.


You can click on any move to add it directly to your opened item. This helps you compare your repertoire lines with up-to-date engine and statistical data, quickly identifying strong continuations and refining your preparation with objective insights.

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


Note: ChessDB combines statistical move data with live engine evaluations to deliver up-to-date and accurate opening insights for all major positions.