The rule: Bellafiore trades only the 3-5 stocks ACTUALLY in play each day — the ones showing high RVOL, strong catalyst, and clear directional bias vs SPY. This scanner replicates that filter mathematically. A+ tier (composite ≥ 8.0) = "One Good Trade" quality, aggressive size. A tier (7.0-7.9) = in play, worth trading. B and below = not in play, skip and preserve capital. From One Good Trade (2010) and The Playbook (2013).