Zwischenzug app unlocks Lichess games only after a player's pulse returns to baseline

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Zwischenzug is an open-source desktop app for macOS and Windows that adds a cooldown to online chess after a loss. It embeds Lichess and locks new games following a defeat, using the Lichess public API to detect losses. With the user's consent, the webcam measures pulse between games, and play resumes once the heart rate stays near a personal baseline, with a timer fallback if no usable signal is available. The developer cites an analysis of 11.3 million Lichess games suggesting that rating performance drops after losses and that a 30-minute break removes the effect, though the study cannot separate tilt from ordinary off days. The camera is off during play, video stays on the user's machine, and telemetry is disabled.

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