Smash-day reversals are high-signal events, but trading every instance without context tends to amplify noise and reduce consistency. Larry Williams frames these as emotional excess: a breakout that attracts late entries, then fails quickly and forces a reversal.

A custom indicator can handle objective detection without auto-execution. It flags confirmed patterns only: bullish when the next bar breaks above the smash bar high, bearish when the next bar breaks below the smash bar low. Outside bars are filtered, and lookback depth is adjustable.

Implementation centers on buffer binding, history mapping, and lightweight real-time updates. OnInit validates sufficient bars and configures plots; OnCalculate converts arrays to forward indexing, scans once on load, then updates the most recent indices on new bars and ticks.

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