A famous game plays on one timeline — you watch and hear it at once. Press ▶ (or Space) to play; ◀ ▶ step a move, drag the bar to fly anywhere, or click a note in the score to jump.

Every move sounds twice — a soft lift as the piece leaves (pitched by which piece it is) and a note as it lands (by where it arrives), so you hear it travel. Captures thud, checks ping, mate gongs; longer moves take a little longer — that's the rhythm. Pick a Sound pack to change the whole voice.

The toggles turn layers on and off:

• Heatmap — what each side reaches (attacks + pawn advances): warm = White, cool = Black, violet = contested.
• Trails — each move's path: knights and castles arc, the rest run straight, each tipped with an arrow for direction. Bolder for stronger pieces and fading as the game goes; a capture leaves a lingering ring.
• Ripples — a brief impact ring on captures, checks and mate.
• Poster — at the final position the heat fades and the squares dim, so the finished trail-tapestry stands out like a print.
• Tension — sound: an ambient drone that swells when the position turns sharp, with a dramatic sting when a sacrifice lands.
• Eval — a Stockfish engine bar beside the board (the white fill = White's advantage) plus a dissonant sting on a blunder. Loads on first use.
• Rich — sound: a fuller, layered voice — the from- and to-squares each get a tone, a captured piece sounds its own note, and castling voices the rook too.