Martingale
Martingale EAs double position size after each loss, betting on eventual reversal. High win-rate cosmetics mask catastrophic ruin risk. Only viable with hard capital limits and full awareness of drawdown maths.
Mechanism
After each losing trade, the EA multiplies lot size by a fixed factor (commonly 2.0x) and re-enters in the same or opposite direction. When a winning trade finally closes, it covers all prior losses plus a small profit. The theoretical win rate approaches 100% — until account equity is insufficient to fund the next step, producing a total loss.
Suitability
Statistically indefensible on trending markets. Any sustained directional move triggers rapid lot escalation and account wipeout. Marginally safer on pairs with documented mean-reversion profiles (EUR/CHF, AUD/NZD) with strict maximum-step limits (≤ 4-5 steps). Capital required scales exponentially with step count. Recommended only for traders who have modelled the exact ruin probability for their chosen parameters.
Notes
Martingale is less a trading edge than a bet against probability. After each loss the EA doubles its position, so that one eventual winner recovers every prior loss plus a small profit. On a backtest this manufactures a near-100% win rate and a beautifully smooth equity curve — right up until a losing streak runs longer than the account can fund, at which point the loss is total. The maths is not subtle: the cosmetic win rate hides a fat, account-ending tail.
This catalogue lists martingale strategies for completeness and honesty, not as a recommendation. If a martingale EA is used at all, it should be with hard limits: a strict cap on the number of doubling steps (typically four to five), a documented worst-case loss the trader has actually calculated, and capital that can be lost in full without consequence.
When evaluating a martingale EA on this catalogue:
- Maximum step count — every additional step roughly doubles the capital at risk.
- Ruin probability — has the exact probability of hitting the step limit been modelled, not guessed?
- Market fit — only documented mean-reverting pairs (EUR/CHF, AUD/NZD) are even arguably defensible.
- The drawdown is real — the “extreme” rating means a full account loss is a live outcome, not a tail you can ignore.
Glossary