...
  // Think of setup as a map, works similarly to chess FEN notation.
  // Each piece has to have unique name,
  // same names mean it's the same piece occupying multiple squares.
  // '.' means empty square, '/' starts a new line.
  const setup = 'G1 K K G2/G1 K K G2/B S S R/B N L R/ P1 . . P2';

  // https://github.com/WandererXII/sliding-puzzles/blob/main/src/configuration.ts
  const cfg = {
    solution: sol,
    onVictory: win,
    onMove: move,
  };

  SlidingPuzzles(document.getElementById('game'), setup, cgf);
  ...