About ChessOpenings

ChessOpenings exists because opening Memorization without understanding loses to the first surprise.

Club players face the same fifteen openings ninety percent of the time. The database covers those fifteen (plus one wildcard) with what matters: the move sequence, the idea that generates it, the trap that punishes carelessness, and who the opening suits.

Every entry leads with the IDEA — because understanding why the knight goes to f3 survives the moment your opponent plays something off-script, and memorization does not.

We are players and educators, not a course business. Nothing here sells memberships, and the table works offline in your browser.

What makes ChessOpenings different

• Your numbers never leave your browser. Every calculator on ChessOpenings runs entirely on your device. We never see, store, or transmit the figures you enter — there are no accounts and no server-side processing of your inputs.
• Published methodology. Each calculator page explains the exact formula it uses and the assumptions behind it, so you can check our work or reproduce it in a spreadsheet.
• Free, forever, without a paywall. ChessOpenings is supported by advertising. There is no premium tier, no email gate, and no upsell.

Independence

ChessOpenings is an independent educational project. We are not affiliated with, endorsed by, or acting on behalf of any government agency, lender, insurer, or the organizations whose formulas and public data we reference (such as established opening theory and master-practice statistics). All trademarks and referenced standards belong to their respective owners.

Questions, corrections, or suggestions are genuinely welcome — get in touch.