The Impossible EA — Optimisation Settings
The Impossible EA works out of the box — attach to EURUSD M5 and trade. Default parameters are genetically optimised on 3 years of data (2023-2025). An optimised v4 .set file is also available with wider SL calibrated for live tick conditions.
EURUSD results are sensitive to broker spreads. The pullback strategy targets 20 pips TP and breakout targets 31 pips — even 1 pip of extra spread costs 3-5% of profit per trade. For best results, use a broker with tight EURUSD spreads.
Looking for The Impossible Gold (XAUUSD) settings? See the Gold Optimisation Settings.
Links
| The Impossible EA — FREE on MQL5 Market |
| Live Signal |
| The Impossible Gold (XAUUSD) — Optimisation Settings |
| MQL5 Seller Profile |
| Discord Community — signals, prop firm tips, trader chat |
Default Parameters
All v4.91 defaults listed below. Three independent strategies — each with its own session, filters, and day blocking.
Pullback Strategy
| Parameter | Default |
|---|---|
| PB_Enabled | true |
| TP_Pips | 20 |
| SL_Pips | 5 |
| PB_TrendEMA | 50 |
| PB_PullbackEMA | 20 |
| PB_RSI_Low / High | 40 / 60 |
| PB_MinADX / MaxADX | 15 / 35 |
| PB_MinEMASlope | 0.12 |
| PB_SessionStart / End | 9 / 12 GMT |
| PB_TradeDirection | 1 (Buy Only) |
| PB_MinBarsBetween | 11 |
| PB_MaxLossesPerDay | 3 |
| PB_MaxTradesPerDay | 2 |
| PB_BlockWednesday | true |
| PB_BlockFriday | true |
| PB_BlockDNRegime | true |
Breakout Strategy
| Parameter | Default |
|---|---|
| BO_Enabled | true |
| BO_TP_Pips / SL_Pips | 31 / 12 |
| BO_LookbackBars | 60 |
| BO_BufferPips | 3.0 |
| BO_MinRange / MaxRange | 10 / 80 |
| BO_SessionStart / End | 8 / 16 GMT |
| BO_ExcludeStart / End | 14 / 15 |
| BO_SellExcludeStart / End | 10 / 12 |
| BO_BuyExcludeStart / End | 8 / 10 |
| BO_BuyExclude2Start / End | 14 / 15 |
| BO_MinBarsBetween | 5 |
| BO_BlockTuesday | true |
| BO_BlockWednesday | true |
| BO_BlockFriday | true |
RSI Reversal Strategy
| Parameter | Default |
|---|---|
| RSI_Enabled | true |
| RSI_TP_Pips / SL_Pips | 6 / 6 |
| RSI_Period | 8 |
| RSI_Oversold / Overbought | 30 / 70 |
| RSI_MaxADX | 25 |
| RSI_SessionStart / End | 6 / 16 GMT |
| RSI_BlockWednesday | true |
Risk and Trade Management
| Parameter | Default |
|---|---|
| RiskPerTrade | 3.0% |
| CompoundAggressive | true |
| MaxOpenTrades | 1 |
| MaxDailyLoss | 30% |
| MaxDrawdown | 50% |
| MaxSpread | 20 |
| CooldownBars | 4 |
| MaxTradesPerHour | 10 |
| UseBreakeven | true (trigger 10, offset 3) |
| UseTrailingStop | true (start 10, step 6) |
| SpreadMultiplier | 3 |
| EnableShield | true (400% arm, 10% DD) |
| MagicNumber | 88888 |
Regime Filter
| Parameter | Default |
|---|---|
| EnableRegimeFilter | true |
| RegimeEMAPeriod | 50 |
| RegimeLookback | 4 |
| RegimeMinSlope | 0.30 |
| RegimeDirectional | false |
| RegimeAllowFlat | false |
News Filter
| Parameter | Default |
|---|---|
| EnableNewsFilter | true |
| NewsMinutesBefore | 30 |
| NewsMinutesAfter | 15 |
Optimised Set File
v4 is a reliability upgrade over v3. The v3 .set used a 5-pip SL that showed strong results on OHLC — but on Every Tick (Random Delay), the tight SL was destroyed by real spreads and slippage. v4 fixes this with wider SL/TP calibrated to actual ATR, reduced risk sizing, and a consecutive-loss circuit breaker.
What changed from defaults to v4 (15 parameters):
| Parameter | Default | v4 | Why |
|---|---|---|---|
| SL_Pips | 5 | 10 | 5 pips too tight for real tick data — normal spread/slippage triggers stop before move develops |
| TP_Pips | 20 | 15 | ATR=1.8 pips/bar — 20 pips rarely reached in current conditions |
| RiskPerTrade | 3.0% | 2.0% | Reduced position sizing with wider SL — same dollar risk per trade |
| MaxSpread | 20 | 35 | Was blocking valid trades — raised but still protective |
| CooldownBars | 4 | 6 | Reduces revenge trading after SL streaks |
| MaxConsecLosses | 0 (off) | 3 | Global circuit breaker — pauses ALL strategies after 3 consecutive losses until next day |
| PB_MaxTradesPerDay | 2 | 3 | Wider SL = fewer stops hit, allow more opportunity |
| PB_TradeDirection | 1 (Buy Only) | 0 (Both) | Allows sell trades — regime filter handles direction |
| PB_SessionStart / End | 9 / 12 | 7 / 15 | Wider pullback window to catch more setups |
| RSI_Enabled | true | false | Minimal contribution in recent data — disabled to reduce noise |
| BreakevenTrigger | 10 | 8 | Proportional to new SL=10 (80% trigger ratio) |
| TrailingStart | 10 | 8 | Earlier trailing engagement with wider SL |
| TrailingStep | 6 | 5 | Tighter trail step — locks profit faster on real tick data |
| RegimeMinSlope | 0.30 | 0.10 | Flat markets kept EA inactive at 0.30 — lowered threshold |
| RegimeAllowFlat | false | true | Allows trading when weekly regime is flat |
Consecutive Loss Circuit Breaker (new in v4): MaxConsecLosses=3 pauses all strategies after 3 consecutive losses until the next trading day. On EA restart, RecoverStatsFromHistory() rebuilds the loss counter from broker deal history — no state is lost on restart or reconnection.
Every Tick validation (Q1 2026): +15.6% ($1,000 → $1,156), 105 trades, 59.0% win rate, 13.1% max DD. Random Delay outperforms OHLC (+4.9%) — proving v4 is not overfit. v3's tight SL was artificially inflated on OHLC; v4's SL=10 survives both tick models.
How to Load a Set File
- Download the .set file (request via comment or PM)
- Open MT5 and attach the EA to EURUSD M5
- In the EA inputs tab, click Load and browse to the downloaded file
- Click OK — all parameters are applied
To return to defaults at any time, click Reset in the inputs tab.
Version History
| Date | Set File | Changes |
|---|---|---|
| Mar 2026 | v4 (current) | Reliability upgrade. SL widened 5→10, TP reduced 20→15, RiskPerTrade 3→2%, MaxConsecLosses=3 circuit breaker added. RSI strategy disabled. Regime filter loosened (MinSlope 0.30→0.10, AllowFlat=true). Trailing start/step tightened for live tick conditions. 15 parameters changed. |
| Feb 2026 | v3 | OHLC-optimised. Strong in-sample but tight SL=5 failed on Every Tick (Random Delay). Superseded by v4. |
| Jan 2026 | v1 | Initial release. Default parameters. |
Past performance does not guarantee future results. Trading involves significant risk. Only trade with capital you can afford to lose.
