Level 6 · Lesson 13
Strategy
Stress Test
Break it before the market does. If your strategy survives these tests, it survives anything.
First — Why This Matters
🔍 The Earthquake Drill
Japan builds every skyscraper to withstand a magnitude 9 earthquake — not because they expect one every week, but because when it comes, the building must survive. They do not build for average conditions. They build for the WORST conditions.
Your trading strategy must survive its own earthquake: 10+ consecutive losses, news slippage that triples your risk, spread widening that triggers your stop, and the psychological breakdown that follows all of these. If you have not stress-tested for these scenarios, you are a skyscraper built for calm weather.
🔎 REAL SCENARIO
A funded trader had a solid strategy: 51% WR, 1:2 R:R, 1% risk. Backtest max streak: 7. In month 4, he hit 11 consecutive losses (11% drawdown) and panicked. He doubled his risk to "recover faster" and lost 4 more trades at 2% each (+8% additional damage). Total: 19% drawdown. The prop firm cut him at 20%. If he had stayed at 1% through the streak, the 11 losses would have cost 11%, he would have recovered within 6 weeks, and he would still be funded.
01 — The Drawdown Journey
What Every Trader Will Experience
Watch an account go through a drawdown and recovery. Notice the psychological markers — these are the moments where most traders break.
02 — 4 Stress Events
Your Strategy Must Survive All of These
03 — The 6 Stress Tests
Run Each One on Your Strategy
04 — The Drawdown Trap
Why Deep Drawdowns Are Exponentially Harder to Recover
| Drawdown | Gain to Recover | Trades at +£50 EV | How It Feels |
|---|---|---|---|
| 5% | 5.3% | ~11 | Annoying but manageable |
| 10% | 11.1% | ~22 | Uncomfortable. Doubt creeps in. |
| 15% | 17.6% | ~35 | Painful. "Is the strategy broken?" |
| 20% | 25.0% | ~50 | Severe. Most traders break rules here. |
| 30% | 42.9% | ~86 | Critical. Account potentially unrecoverable. |
| 50% | 100% | ~200 | Terminal. Need to double your money just to get back. |
💡 The asymmetry is the key insight. A 10% drawdown needs 11.1% to recover — manageable. A 50% drawdown needs 100% — you need to DOUBLE your remaining money. This is why risk per trade must be small enough that even the worst possible streak keeps you in recoverable territory (<15%).
05 — Stress Test Calculator
Stress Test YOUR Strategy
Enter your numbers and see how the worst-case scenario plays out.
Account (£)
Risk per Trade (%)
Backtest Max Losing Streak
Win Rate (%)
Avg Win (£)
Avg Loss (£)
WORST-CASE SCENARIO RESULTS:
Expected Live Max Streak
12 losses
Max Drawdown
12.0%
Account After DD
£8800
£ Lost in DD
-£1200
Recovery Needed
13.6%
Trades to Recover
~28
Moderate risk. Survivable but psychologically challenging.
06 — Walk-Away Rules
Hard Limits That Save Accounts
These are NOT suggestions. They are circuit breakers that prevent the psychological spiral following drawdowns.
07 — Prop Firm Survival
Sizing for Funded Accounts
Prop firms typically allow 5-10% maximum drawdown. Your risk per trade must be sized so that the WORST expected streak stays under this limit.
Risk% = Max DD Allowed ÷ (Backtest Max Streak × 1.5)
5% DD limit, 8 max streak: 5 ÷ 12 = 0.42% per trade
8% DD limit, 8 max streak: 8 ÷ 12 = 0.67% per trade
10% DD limit, 8 max streak: 10 ÷ 12 = 0.83% per trade
💡 The uncomfortable truth: most funded traders risk 1-2% per trade on accounts with 10% DD limits. With a 12-loss streak, that is 12-24% — instant breach. The math says 0.5-0.8% is the maximum safe risk. This feels painfully small, but it is the price of staying funded.
08 — Common Mistakes
4 Stress Test Failures
1. "That streak would never happen to me" — It will. Every statistical anomaly eventually occurs. The question is not IF but WHEN. Size for it NOW.
2. Increasing risk after a drawdown to "recover faster" — This is the #1 account killer. After a 10% DD, doubling risk means the NEXT losing streak costs 20% instead of 10%. Recovery gets harder, not easier.
3. No walk-away rules — Without hard limits, you trade through emotional spirals. The 7-loss drawdown (7%) becomes a 15% catastrophe because you took 8 more emotional trades trying to recover.
4. Holding trades through major news — Your 10-pip stop becomes a 30-pip loss through slippage. One news event can cost 3× your planned risk. Close short-term trades before scheduled releases.
09 — Cheat Sheet
Stress Test Quick Reference
MAX STREAK = Backtest max × 1.5. Size risk so this does not exceed 15%.
NEWS = Close short-term trades 15 min before NFP/FOMC/CPI. No exceptions.
SPREAD = Avoid trading during rollover. Add 3× normal spread buffer to stops.
WALK-AWAY = 3 losses = session over. 2% daily = day over. 5% weekly = week over.
PROP SIZING = Risk% = DD limit ÷ (max streak × 1.5). Usually 0.5-0.8% per trade.
NEVER = Increase risk after a drawdown. Hold through major news on 15M. Skip walk-away rules.
10 — Test Your Understanding
Stress Test Game
5 worst-case scenarios. Make the survival call.
Your backtest shows a max 8-loss streak. You risk 1.5% per trade on a £10,000 account. In live trading, you hit a 12-loss streak (1.5× the backtest max). What is your account balance after the streak?
11 — Knowledge Check
Final Quiz — 8 Questions
Question 1 of 8
Your backtest shows a max 6-loss streak. What should you prepare for in live trading?
Question 2 of 8
A 10% drawdown requires what percentage gain to recover?
Question 3 of 8
When should you close short-term trades before a major news event?
Question 4 of 8
What is the "walk-away rule" and when does it activate?
Question 5 of 8
A weekend gap on Gold moves your 15-pip stop to a 40-pip fill. How do you prevent this in the future?
Question 6 of 8
What is the most dangerous phase of a drawdown?
Question 7 of 8
How should you size your risk if your max backtest losing streak is 8 and your prop firm maximum drawdown is 10%?
Question 8 of 8
Your strategy has been net positive for 6 months but had 2 losing months. Is the strategy working?