Select a specific built-in or uploaded repertoire variation, reveal its valid moves directly on the board and compare three locally calculated Stockfish continuations.
Practice chess openings with detailed Nimzowitsch-Larsen, Owen, English and Queen's Indian repertoires, visual move hints and local Stockfish analysis.
Learn six compact beginner repertoires plus two detailed hypermodern repertoires with many important opponent variations.
As White, practice the Vienna Game, Grand Prix Attack, French Advance, Caro-Kann Two Knights and a detailed 1.b3 Nimzowitsch-Larsen repertoire.
As Black, practice the Scandinavian Defense, a Queen's Gambit Declined ...d5 setup and a combined queenside-fianchetto repertoire covering Owen's Defense, English Defense and Queen's Indian structures.
Upload PGN or PGN-formatted text files with variations; repertoire files are parsed and used locally in your browser.
A Stockfish WebAssembly engine evaluates every board position locally, updates the evaluation bar and shows three candidate lines without sending positions to an analysis service.
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