/**
 * Source of the opening data.
 * eco_tsv is the authoritative source from lichess.
 */
export type OpeningSource = "eco_tsv" | "eco_js" | "scid" | "eco_wikip" | "wiki_b" | "ct" | "chessGraph" | "chronos" | "icsbot" | "pgn" | "interpolated";
/**
 * ECO category (A-E)
 */
export type EcoCategory = "A" | "B" | "C" | "D" | "E";
/**
 * Opening variation record keyed by FEN position
 */
export interface Opening {
    /** Source of this opening data */
    src: OpeningSource;
    /** ECO code (e.g., "B03"). Not unique - many openings share the same ECO code */
    eco: string;
    /** Standard algebraic notation move sequence (e.g., "1. e4 Nf6 2. e5") */
    moves: string;
    /** Common English name of the opening */
    name: string;
    /** Alternative names from other sources */
    aliases?: Record<string, string>;
    /** Extended SCID code when applicable */
    scid?: string;
    /** True if this is the official ECO root variation for this code */
    isEcoRoot?: boolean;
    /** For interpolated openings: the original source of the root variation */
    rootSrc?: OpeningSource;
}
/**
 * Collection of openings keyed by FEN notation
 * FEN is the unique identifier for each position
 */
export interface OpeningCollection {
    [fen: string]: Opening;
}
/**
 * Opening transition in the fromTo graph
 * [from_fen, to_fen, from_source, to_source]
 */
export type OpeningTransition = [string, string, OpeningSource, OpeningSource];
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