The Smooth Equity Curve of Martingale and Grid Systems
Posted: Tue Oct 27, 2026 3:59 am
Martingale and grid expert advisors tend to produce attractive backtests. By adding to losing positions, they convert most small adverse moves into small wins, giving a high win rate and a gently rising curve. The cost is hidden in a rarely visited tail.
Each averaging step increases exposure while the account's margin stays fixed. When price trends far enough in one direction, the position grows until either margin is exhausted or a stop closes a loss that wipes out many prior wins. The backtest may contain few or none of those events, which makes the strategy appear safer than it is.
Statistically, the win rate is high because the loss is deferred, not avoided. Measures such as profit factor and win percentage mislead here, while maximum floating drawdown, worst adverse excursion and required margin tell the real story.
Stress testing should include trending periods, gap events, and wider spreads, plus an examination of the largest open position size the system ever reaches. A system whose survival depends on price eventually reverting carries a risk of ruin that no average figure reveals. Fixed-risk alternatives with a defined stop per trade expose losses openly, which makes them easier to evaluate honestly.
Each averaging step increases exposure while the account's margin stays fixed. When price trends far enough in one direction, the position grows until either margin is exhausted or a stop closes a loss that wipes out many prior wins. The backtest may contain few or none of those events, which makes the strategy appear safer than it is.
Statistically, the win rate is high because the loss is deferred, not avoided. Measures such as profit factor and win percentage mislead here, while maximum floating drawdown, worst adverse excursion and required margin tell the real story.
Stress testing should include trending periods, gap events, and wider spreads, plus an examination of the largest open position size the system ever reaches. A system whose survival depends on price eventually reverting carries a risk of ruin that no average figure reveals. Fixed-risk alternatives with a defined stop per trade expose losses openly, which makes them easier to evaluate honestly.