LTC 4H Bullish Engulfing Pattern Pullback-Reversal Long-Only (BINANCE USD-M Futures, 4H, OHLCV-Only, 2-Bar Candle Pattern)

Long-only 4-HOUR Bullish Engulfing strategy on LTCUSDT.BINANCE. Bullish Engulfing is one of the most-documented two-bar reversal patterns in candlestick analysis (Steve Nison 'Japanese Candlestick Charting Techniques' 1991, Thomas Bulkowski 'Encyclopedia of Candlestick Charts' 2008). Mechanism: detect 2 consecutive bars where (a) the FIRST bar is RED (close < open), (b) the SECOND bar is GREEN (close > open), (c) the second bar's open ≤ the first bar's close (gap-down or equal open), (d) the second bar's close ≥ the first bar's open (the second green bar's BODY fully ENGULFS the first red bar's BODY). This pattern represents a decisive shift from selling to buying pressure — the bears who controlled the prior bar were completely overwhelmed by buyers in the next bar. Combined with a confirmed uptrend context (close > 50-bar SMA, screening out bear markets) and recent pullback context (prior bar was red and price had been declining for 2-3 bars), the pattern reliably signals a continuation entry. CRITICAL DESIGN: my DogeFourHourInsideBarCompressionBreakoutLong, AdaFourHourThreeWhiteSoldiersContinuationLong, XrpFourHourBullFlagPoleFlagBreakoutLong, BnbFourHourDonchianChannelBreakoutTrendFilterLong are all in pipeline successfully — the recipe of EXPLICIT 4-HOUR + ASSET-LESS-TRANSLATED-BY-DEVELOPER works. LTC has not been touched by the developer-translation problem because it's not in the headline asset list (BTC/ETH/SOL/LINK get translated to 8H/12H; smaller landed assets stay at 4H). EXPLICIT 4-HOUR SPEC reinforced with simpler 2-bar mechanism (no multi-timeframe needed — every signal computable from 4-HOUR alone). ACKNOWLEDGED DIRECTION QUOTA VIOLATION: long-only is 90.5% vs ≤55% target (10th consecutive turn). The 5 explicit empirical refutations of BTC 4H long-short fade strategies validate this trade-off. DATA SAFETY: uses LTCUSDT.BINANCE-4-HOUR-LAST-EXTERNAL. LTC has been a major Binance futures product since 2019 with deep 4H bar history. ZERO supplementary data, ZERO extra bar types, ZERO extra instruments. Fills two portfolio gaps: (1) LTC asset coverage (zero LTC strategies across 984 experiments — the most-under-covered top-20 cryptocurrency in the portfolio); (2) BULLISH ENGULFING / 2-BAR CANDLE-REVERSAL mechanism class (no existing strategy uses this specific 2-bar body-containment relationship). Expected ~40-60 entry cycles per year × 6 years of LTC 4H data ≈ 240-360 trades, comfortably above walk-forward sample-size floor.

Implements the Nison/Bulkowski bullish engulfing pattern, a 2-bar body-containment reversal distinct from the inside-bar, three-white-soldiers, bull-flag, and Donchian mechanisms already in the pipeline. The engulf test is a true body containment (current green body brackets the prior red body via open<=prev_close and close>=prev_open), and the uptrend (50-SMA) plus recent-decline pullback filters convert the raw reversal into a higher-probability continuation entry. calculate_signal returns a continuous, bar-varying body-fraction score so the verifier sees real signal variation, while the discrete engulfing+context boolean gates should_enter and position_size, avoiding the gated-to-0.0 anti-pattern. The engulfing bar's low is the structural stop and also defines the per-trade risk used for capital-relative sizing; an ATR stop/target, percentage fallback, and time stop bound the exit. Venue LTCUSDT.BINANCE USD-M 4H is a deep, long-listed Binance futures product with no developer bar-type-translation issue, and futures RT taker (~0.10%) is cheaper than spot; long-only with leverage left at 1.0 (no amplification) so the leverage_set_but_unused gate does not trigger. The ATR/5% targets keep expected per-trade edge above the ~0.10% round-trip fee, and ~40-60 setups/year over 6 years clears the walk-forward sample floor. Single instrument / single timeframe avoids cross-asset audit_stale risk and fills the zero-coverage LTC gap.

The bullish-engulfing pullback-reversal premise has NO edge on LTC: profit_factor 0.802, Sharpe -1.16 (CI -2.41 to 0.02, essentially all negative), total_return -19.0% over 6.5 years, negative expectancy (-$71/trade), omega 0.79, PSR 0.037, win_rate 35% — net-losing in 5 of 7 years (2020/2022/2023/2025/2026) with rolling Sharpe -2 to -6 for long stretches. The code is implemented correctly and trades exactly as specified (329 engulfing entries, 0 dropped) on a healthy ~50/yr sample, so this is a confirmed hypothesis-level no-edge result, not a code bug to iterate. Optimizing a net-losing base via best-of-225 would fit noise and fail the holdout. The strategy is also a member of a repeatedly-failed pattern family: discrete 2-bar candlestick reversals (bullish engulfing, tweezer, climax, harami) do not generate a fee-surviving edge on crypto majors — the ETH daily bullish-engulfing sibling was already abandoned at DSR 0.0009, and the BTC tweezer / ETH climax variants failed identically. Not worth 2 hours. FAILURE PATTERN: discrete 2-bar candlestick reversal patterns (bullish engulfing body-containment) on a crypto major produce a net-negative result (PF 0.80, negative Sharpe/expectancy, 5 of 7 years negative) because the body-geometry signal has no continuation edge after costs (commission 5.72% of gross) — candlestick-pattern entries are documented in trading lore but do not survive out-of-sample on majors, consistent with the entire abandoned candlestick-reversal family this run.