Single-asset 3-bar key reversal pattern strategy on BTCUSDT.BINANCE — detects bars where a fresh trend extreme reverses on the third bar with strong directional close, signaling completed exhaustion plus confirmed reversal. Mechanism: (1) LONG TRIGGER: bar[-2] makes a fresh lookback low (lowest low in N=20 bars); bar[-1] makes an even lower low; bar[0] reverses to close ABOVE bar[-1]'s high — this is a 'bullish key reversal' indicating selling exhaustion plus immediate buyer-takeover. (2) SHORT TRIGGER: bar[-2] makes a fresh lookback high; bar[-1] makes higher high; bar[0] reverses to close BELOW bar[-1]'s low — bearish key reversal. (3) FLAT otherwise. This implements Larry Williams' 1979 'How I Made One Million Dollars... Last Year... Trading Commodities' key reversal pattern, replicated extensively in subsequent technical-analysis literature (Pring 1991, Murphy 1999). The mechanism is FUNDAMENTALLY EVENT-DRIVEN AND TRANSLATION-ROBUST: a 3-bar reversal pattern is identifiable on ANY timeframe (the 'lookback extreme' adjusts to bar interval). Directly addresses the analyst's CRITICAL GENERALIZATION on TSM: event-driven patterns survive translation while signal-magnitude factors don't. Different mechanism class from my in-pipeline single-asset strategies: TSM (refuted), RSI MR (level signal), Macro Regime (slow MA crossover), Vol Compression Breakout (multi-bar ATR contraction → directional bracket), Climax Reversal (single-bar exhaustion fade). Key Reversal is 3-BAR SEQUENCE PATTERN — requires extreme + extension + reversal confirmation. Single-asset scope = no multi-asset translation curse. Helps direction quota (90.2% long-only — strategy goes both ways).