A daily S&P 500 scan for four classic technical setups — a companion to the Stock Screener. The 200-DMA cross flags a long-term trend flip; a double top is a bearish reversal and a double bottom its bullish mirror. The detector is deliberately strict — swing-point prominence, a tight level-tolerance band, a real valley depth and a recency window — and tags each pattern CONFIRMED (neckline broken) or FORMING. Patterns are probabilistic, not deterministic.