Pipsgrowth EX17023 Volatility

EX17023 is a memory-optimized Gaussian-band breakout Expert Advisor distilled from a longer-bodied Gaussian-Band template. The defining design choice sits in the indicator handle count: where most breakout EAs in the same family open four or five MT5 indicator handles at OnInit, EX17023 opens exactly three — a single EMA used as the Gaussian midline, an ATR(14) for envelope width and stop distance, and a higher-timeframe EMA used solely for trend direction. Every entry, every trailing-stop ratchet, every breakeven shove, and every profit-lock step is computed from those three handles. The payoff is lighter terminal-state memory and faster restart on chart-switch, but the strategy stack is identical to the heavier version: a two-bar-inside-then-outside breakout with slope, candle-strength, and HTF-trend alignment gates, an ATR-multiplied trailing stop, a breakeven, and a stepped dynamic profit-lock.

The Gaussian midline is a period-10 EMA of close (the Length input, default 10) sourced through GaussianFilter(0) and GaussianFilter(1). The band envelope is built as gaussNow ± DistanceMultiplier × ATR(14), where DistanceMultiplier defaults to 0.85. The 0.85 figure is itself the subject of an auto-tune routine: AutoTuneFilters() runs once per tick when UseAutoFilter is on, measures the live spread, decides whether to treat the symbol as 4-decimal or 2-decimal (pipFactor = 0.0001 if spread < 3, else 0.01), and clamps the minimum ATR to roughly 3 pips of the relevant unit. For XAUUSD, where the spread reads in cents on a 2-decimal price, that branch picks the 0.01 pip factor and sets minATR near 0.03 — which is the default MinATR value in the input group. If the live ATR falls under that floor, OnTick returns immediately and no setup is built.

The breakout condition is the same two-bar-inside-then-outside pattern the rest of the GB family uses. A long setup needs the current bar to close above the upper band while the previous two bars both closed below it; the previous two bars are read from iClose(_Symbol, g_Timeframe, 1) and iClose(_Symbol, g_Timeframe, 2). A short setup mirrors the rule on the lower band. The 60%-body candle-strength gate from the heavier EX17009 is preserved: a strong candle is one whose body (MathAbs(price - open)) is at least 60% of the full candle range (high - low). The slope gate requires the current Gaussian value to be above the previous one for longs and below for shorts. The break-distance gate requires price - gaussNow > breakDistance × ATR for longs, with MinBreakDistance defaulting to 0.3 — so price must stretch at least 0.3×ATR beyond the midline before the band break is treated as meaningful. Finally, the trend gate is a single line: price must be on the correct side of the H4 EMA(50) (emaHandle = iMA(_Symbol, PERIOD_H4, 50, 0, MODE_EMA, PRICE_CLOSE)) for the direction of the trade.

If the gate stack passes, the EA closes any opposite position through CloseOpposite() and fires a new market order via the CTrade wrapper. The default lot is 0.1, with no money-management scaling — Lots is a fixed input. Position caps come from two controls: MaxOpenTrades (default 5) counts the EA's open tickets on the symbol, and AllowOnlyProfitableAdditions (default true) refuses to add a new ticket until every open position has at least MinProfitPerTradeToAdd dollars of profit (default $5). If OneTradeOnly is flipped on, the EA holds at most one position at a time and PositionExists() becomes the sole gate. The 3-retry wrappers TryClose_EX17023, TryClosePartial_EX17023, and TryModify_EX17023 all use 200 ms sleeps for closes and 100 ms for modifies, retrying on requote, timeout, or price-changed/price-off return codes.

Position management runs every tick while a position is open. The exit signal is the simplest one in the codebase: if the close price crosses back through the Gaussian midline in the wrong direction, the EA closes the trade. There is no time-decay, no partial close, no profit-target function — exits are either the midline cross, the fixed TP, or the protective ratchets. The midline-cross exit fires before any of the ratchets move the stop, so a position that swings through the band and back through the midline is taken out at the cross rather than at the trailing stop.

The protective stack has three layers, applied in order. First is the trailing stop, gated by UseTrailingStop = true. The new stop is bid - ATR_MultiplierSL × ATR for longs, and it only replaces the existing stop if it is higher. ATR_MultiplierSL defaults to 1.2, so the stop sits roughly 1.2×ATR below current price after each favourable tick. Second is breakeven, gated by UseBreakeven = true. The EA pushes the stop to entry price once the trade is more than ATR_MultiplierSL × ATR in profit and the current stop is still below entry (or, for shorts, still above entry). Third is the dynamic profit lock, gated by EnableDynamicLockProfit = true. This is the most distinctive piece of EX17023's exit machinery. The function reads current profit, divides it by LockProfitEvery_X_Dollars (default 2.0), floors the result to a step count, and computes a target locked profit of stepCount × 2.0 - LockMinusBuffer (default buffer 1.0). It then converts that dollar figure into a price offset using tickValue and tickSize, and moves the stop to entry + priceDiff for longs (or entry - priceDiff for shorts). The stop only ever moves forward — there is no ratchet-back logic — so once a profit is locked, it stays locked at that step or better.

The risk ceiling is a single equity-drawdown gate. CheckMaxDrawdown() computes 100 × (balance - equity) / balance and returns false if it exceeds MaxDrawdownPercent (default 10.0). When the gate fails, OnTick returns immediately — no entries, no exit checks, no ratchets — until the equity draw recovers. The 10% ceiling is intentionally loose compared to typical scalper profiles; the EA is built around a single trade holding a 160-point TP target with a 120-point hard SL floor under the ATR-derived stop, so the per-trade risk is bounded by whichever is larger: ATR × 1.2 or 120 points.

Practically, EX17023 is intended for XAUUSD on M5–H1 (the parser maps the default Timeframe = 0 input to PERIOD_H1; DB rows flag M5 as the tested timeframe). The H4 trend filter means the EA is sensitive to the structure of the higher timeframe and may skip valid intraday breakouts when the H4 trend is misaligned — that is by design. The dynamic profit-lock, the 60%-body candle filter, and the midline-cross exit together produce a system that prefers fewer, more deliberate trades over the high-frequency breakout bursts that simpler GB templates deliver. Backtests on lower spreads (under 20 points on XAUUSD) will see the auto-tuned band contract tighter; on wider spreads, the band widens and fewer setups qualify. If a trader finds the EA too quiet, dropping DistanceMultiplier toward 0.7 produces more frequent signals at the cost of more false breaks. If too noisy, raising it to 1.0 or higher waits for cleaner extensions beyond the midline.