The Turtle Trading Strategy is a systematic trend-following trading methodology developed by legendary commodity traders Richard Dennis and William Eckhardt in the early 1980s. The strategy is based on trading breakouts to new 20-day or 55-day highs and lows, using mechanical rules for entries, exits, position sizing, and risk management — with no discretion or subjective judgment required. Dennis proved the strategy worked by teaching it to a group of 23 inexperienced traders (called “the Turtles”), who collectively generated over $175 million in profits in five years. The Turtle Trading Strategy is one of the most famous and extensively documented systematic trading methods in financial history.
Introduction: The Most Famous Trading Experiment in History
In 1983, two legendary Chicago traders made a bet that would become one of the most famous stories in financial markets. Richard Dennis — who had turned a $5,000 investment into over $100 million trading commodities — believed that great traders could be made. His partner William Eckhardt believed traders were born.
To settle the debate, Dennis recruited 23 ordinary people — a security guard, a professional poker player, a Dungeons & Dragons game designer, fresh graduates, experienced investors — and taught them his complete trading system over two weeks. He called them “Turtles” — reportedly inspired by turtle farms he had seen in Singapore, imagining he could grow traders just as turtle farmers grew turtles.
The results were extraordinary. Over the next five years, the Turtles collectively generated over $175 million in profits. Dennis won the bet — definitively. Great traders could be made with the right system and rules.
The Turtle Trading Strategy — the exact system Dennis taught — has since been reverse-engineered, published in books, backtested across decades, and adapted by systematic traders worldwide. It remains one of the most important trend-following systems ever created.
The Origin Story: Richard Dennis and William Eckhardt
Richard Dennis: The Prince of the Pit
Richard Dennis grew up in Chicago and started trading commodity futures at age 17. By the 1970s, trading from the Chicago Mercantile Exchange floor, he had turned a borrowed $1,600 into $200 million. His nickname — “The Prince of the Pit” — reflected his legendary status in commodity trading.
Dennis’s edge was fundamentally systematic. He followed trends mechanically, cut losses quickly, let profits run, and applied consistent position sizing across all markets. These principles formed the backbone of what became the Turtle System.
The 1983 Experiment
Dennis placed advertisements in the Wall Street Journal, Barron’s, and other publications seeking trading recruits. Over 1,000 people applied. From 40 finalists, he selected 23 people — deliberately including individuals with no trading experience — to prove his system could be taught to anyone.
Over a two-week intensive training period in December 1983, Dennis taught the group:
- The exact entry and exit rules of his trading system
- Position sizing and risk management methodology
- The psychological framework needed to follow the system mechanically
Each Turtle received between $500,000 and $2 million of Dennis’s capital to trade. Over the next five years, the group collectively generated approximately $175 million in profits — an annualised return of approximately 80% for the top performers.
Dennis won his bet. Definitively.
The Complete Turtle Trading Rules
The Turtle Trading System operated in two versions — System 1 (shorter-term) and System 2 (longer-term). Dennis taught both systems, with the instruction that if a Turtle was unsure which to use, System 2 was the more reliable.
System 1: The 20-Day Breakout
Entry Rule: Buy when price makes a new 20-day high (long position) or sell when price makes a new 20-day low (short position).
Filter: Do NOT take the System 1 entry if the previous System 1 signal in that market was a winning trade. This filter was intended to prevent multiple entries during choppy, false breakout environments.
Exit Rule: Exit long positions when price makes a new 10-day low. Exit short positions when price makes a new 10-day high.
System 2: The 55-Day Breakout
Entry Rule: Buy when price makes a new 55-day high (long position) or sell when price makes a new 55-day low (short position).
Exit Rule: Exit long positions when price makes a new 20-day low. Exit short positions when price makes a new 20-day high.
System 2 has no filter: All signals are taken, regardless of whether the previous signal was a winner or loser.
Stop-Loss Rules
Both systems used a fixed stop-loss based on a multiple of ATR (Average True Range) — a volatility measure representing the average daily price range.
Stop-loss distance: 2× ATR from the entry price.
For example: If EUR/USD’s 20-day ATR is 100 pips, the stop-loss is placed 200 pips from the entry price.
The ATR-based stop automatically adjusts to each market’s volatility — wider in volatile markets, tighter in calm markets — ensuring consistent risk exposure regardless of the instrument traded.
The N (ATR) Concept: Normalising Risk Across Markets
One of the Turtle System’s most important innovations was using N (their term for ATR) to normalise position sizes across different markets.
A 1% move in crude oil has a completely different dollar impact from a 1% move in Treasury bonds. By expressing stops and position sizes in ATR units, Dennis ensured that each position carried approximately equal risk — regardless of whether the Turtle was trading soybeans, gold, or currencies.
This concept of volatility-adjusted position sizing was ahead of its time in 1983 and remains a cornerstone of modern systematic trading.
Position Sizing: The Unit System
The Turtle position sizing system was built around a concept of “units” — the standard risk module for each trade.
Calculating a Unit
Step 1: Calculate N = 20-day Exponential Moving Average of True Range (ATR)
Step 2: Calculate the dollar value of N for the specific contract:
Dollar N = N × Contract Size (dollar value per point/pip)
Step 3: Calculate the unit size:
Unit Size = (Account × 1% risk per unit) ÷ Dollar N
Example:
- Account size: $1,000,000
- 1% risk per unit: $10,000
- EUR/USD ATR (N): 100 pips
- Dollar value of 1 pip (standard lot): $10
- Dollar N = 100 × $10 = $1,000
- Unit Size = $10,000 ÷ $1,000 = 10 standard lots
Each trade therefore risks approximately 1% of the account regardless of which market is being traded or how volatile it is.
Maximum Position Limits
The Turtles were given strict position limits to prevent over-concentration:
Category | Maximum Units |
Per market | 4 units maximum |
Per correlated market group | 6 units (e.g., multiple grain markets) |
Per direction (all longs or all shorts) | 10-12 units |
Total account | 12 units maximum |
These limits prevented catastrophic loss from a single market or correlated market crisis.
Adding to Winners: The Pyramiding Rules
One of the most important — and psychologically challenging — aspects of the Turtle System was adding to winning positions (pyramiding).
Rather than taking a full position immediately on the breakout entry, Turtles were instructed to add units as the trade moved in their favour:
Unit Added | Price Level |
Unit 1 | Breakout entry price |
Unit 2 | Entry + 0.5 × N |
Unit 3 | Entry + 1.0 × N |
Unit 4 | Entry + 1.5 × N |
This pyramid structure means the largest total position is only reached after the trade has proven itself by moving 1.5 × ATR in the trader’s favour. The stop-loss for all units is then moved to 2 × N below the most recent unit’s entry — locking in progressively more profit as the position grows.
The pyramiding system is psychologically counterintuitive for most traders — it means adding capital when prices have already moved against you from an “ideal” entry perspective. But it is the mechanism by which trend-following systems capture the large trending moves that justify the many small losses on false breakouts.
The Psychological Challenge: Why Rules Must Be Followed
Dennis understood that teaching the mechanical rules was only half the battle. The harder challenge was psychological — executing the system precisely, even when every instinct says otherwise.
The Losing Trade Frequency Problem
The Turtle System — like all trend-following systems — has a low win rate. Only 30-40% of individual trades are winners. The profitability comes from the winners being dramatically larger than the losers (positive risk/reward asymmetry).
Most traders cannot psychologically tolerate a 60-70% losing trade rate. They start “helping” the system — skipping entries, tightening stops, taking profits early — and in doing so, destroy the system’s edge.
Dennis reportedly told the Turtles: “The most important thing is to be consistent. If you are not consistent, your results will not be consistent.”
Not Predicting, Not Filtering — Just Following
The Turtle System requires entering on every valid breakout signal, regardless of fundamental outlook, news environment, or personal conviction about direction. Most retail traders find this extremely difficult — their instinct is to form a view, then trade that view. The Turtle approach is to follow signals mechanically and let the statistics work.
This connects to the broader discipline discussed in our guide on top investing strategies every beginner should know — systematic discipline consistently outperforms discretionary judgment for most participants over long periods.
Turtle Trading Across Asset Classes
The Turtle System was originally applied to commodity futures: grains (corn, soybeans, wheat), energies (crude oil, heating oil), metals (gold, silver, copper), financial futures (Treasury bonds, Eurodollars), and currency futures.
The same breakout logic applies with modification across:
Forex: Major and minor currency pairs respond well to 20-day and 55-day breakout systems. The trend-following logic works on daily charts of EUR/USD, GBP/USD, USD/JPY, and commodity-correlated pairs. Understanding risk management in forex is essential before applying the Turtle System to leveraged currency markets.
Equities: Applied to individual stocks or ETF CFDs (like QQQ, SPY), the system captures major trending moves during bull and bear markets. Short signals during bear markets (2022) and long signals during bull markets (2023-2024) would have been highly profitable.
Commodities: WTI crude oil, gold (XAUUSD), and silver (XAGUSD) — all strong trending instruments — are natural homes for the Turtle approach.
Index CFDs: The S&P 500, Nasdaq 100, and other major indices trend clearly over multi-month periods. The 55-day breakout on daily charts of US500 or US100 would have captured the 2020-2021 bull run and the 2022 bear market decline.
Does the Turtle Trading Strategy Still Work?
This is the most important practical question. The short answer: the core principles work; the exact original parameters require updating.
What Still Works
Trend-following logic: Financial markets continue to trend. The reason they trend — institutional herding behaviour, momentum, fundamental shifts that take time to price in — has not changed. Breakout systems continue to capture these trends.
ATR-based position sizing: Volatility-adjusted position sizing remains best practice in systematic trading. Modern quantitative funds use far more sophisticated versions of the same core concept.
Adding to winners: The pyramiding principle — letting proven winners grow and cutting unproven positions quickly — remains one of the most empirically validated principles in systematic trading.
Diversification across uncorrelated markets: Trading multiple instruments simultaneously with capped position sizes per market remains essential for systematic trading survival.
What Has Changed
More false breakouts in modern markets: Algorithmic trading has increased the frequency of “stop hunts” and false breakouts — temporary penetrations of 20-day highs/lows that immediately reverse. This has increased the losing trade frequency for shorter-term (System 1) breakout approaches.
Lower returns in commodities: Many commodity markets have become range-bound or have changed their trending characteristics. System 2 (55-day) performs more consistently than System 1 in modern environments.
Competition from algos: More systematic traders following similar breakout approaches means signals are more crowded — sometimes reducing the profitability of the first breakout entry versus adding on confirmation.
Adaptation required: Successful modern turtle-style traders adapt the timeframes (longer periods like 55-100 day channels), add confirmation filters, and combine the system with fundamental awareness of major macro regimes.
Turtle Trading in Forex: A Practical Application Guide
For forex traders applying turtle-style breakout principles:
Step 1 — Select instruments: Choose 4-6 liquid forex pairs with strong trending characteristics: EUR/USD, GBP/USD, USD/JPY, AUD/USD, USD/CAD, and NZD/USD are traditional choices.
Step 2 — Calculate 20-day and 55-day highs/lows: Use daily charts. Mark the current 55-day high and low on each pair.
Step 3 — Calculate ATR: Use the 20-day ATR to determine stop-loss distance (2×ATR) and position sizing.
Step 4 — Set entry alerts: Many platforms allow price alerts at the 55-day high/low levels — you don’t need to watch screens constantly.
Step 5 — Execute mechanically: When price breaks the 55-day high (long) or 55-day low (short), enter immediately at market or on the next candle’s open.
Step 6 — Add units: As price moves 0.5×ATR in your favour, add a second unit. Continue to 4 units maximum.
Step 7 — Exit on the 20-day low/high: When price makes a new 20-day low, exit all long units. When it makes a 20-day high, exit all short units.
Step 8 — Maintain position logs: Track every trade, every unit, and your total portfolio exposure by market and direction.
The Psychology Behind the Turtle System: Why Most Traders Failed
Dennis’s greatest challenge was not teaching the rules — it was ensuring traders followed them. Even among the Turtles themselves, there was a wide variance in performance. Some Turtles followed the system precisely and generated extraordinary returns. Others improvised, skipped entries, exited early, and significantly underperformed.
The psychological barriers Dennis identified apply universally to systematic trading:
1. The Pain of False Breakouts
The majority of Turtle entry signals — particularly System 1’s 20-day breakouts — fail. Price breaks to a new 20-day high, you enter long, and within days price reverses back below your entry, hitting your 2×ATR stop. This happens 60-70% of the time.
Experiencing 5, 6, 7 consecutive losing trades while following the system precisely is not a sign the system is broken. It is normal. But the psychological pain of these losing streaks causes most systematic traders to abandon the rules — precisely at the moment when the next large trending move (the one that pays for all the small losses) is most likely to begin.
Dennis reportedly told the Turtles: “The losers do not remember the times their stop was right — only the times it cost them money.”
2. The Impulse to Take Early Profits
When a Turtle entered a breakout and the trade immediately moved in their favour, the natural impulse was to take profits — crystallise the gain before the market reversed. But taking profits early destroys the system’s positive expectancy. The Turtle System makes money because the average winner is 5-10 times larger than the average loser. Exiting winners early converts the system’s profit engine into a grinding, loss-generating machine.
3. The Selective Application Problem
Some Turtles began selecting which signals to take based on their own analysis — skipping signals that “didn’t feel right.” This introduced subjective bias that inevitably hurt performance. Systematic edge comes from taking all valid signals consistently — the long-run statistics only work if you are consistent in execution.
Famous Turtle Traders: Where Are They Now?
Several of the original Turtles went on to significant careers in trading and investment management, providing real-world evidence of the system’s validity.
Jerry Parker (Chesapeake Capital): Perhaps the most successful Turtle trader by longevity. Parker founded Chesapeake Capital in 1988 and has continued running trend-following programmes for decades. His long-term track record is one of the strongest in commodity trading.
Paul Rabar (Rabar Market Research): Another highly successful Turtle who went on to manage significant institutional capital using systematic trend-following approaches derived from his Turtle training.
Salem Abraham: Applied Turtle principles successfully in Texas managing family and client capital over many years.
Liz Cheval (EMC Capital Advisors): One of the two female Turtles, who built a successful commodity trading advisory business.
The collective success of multiple original Turtles across decades of real trading provides the most compelling evidence that Dennis’s system was genuine — not just a fortunate period of trend-following performance in the early 1980s.
Applying Turtle Principles to Modern Forex Trading
The original Turtle System was designed for commodity futures. Here is how the core principles translate to modern forex CFD trading with practical adjustments:
Instrument Selection
Choose 6-8 liquid, trending forex pairs with low correlation to each other:
- EUR/USD: Deep liquidity, clear macro trends
- USD/JPY: Strong yen carry trade trends; BoJ policy sensitivity
- GBP/USD: Significant Brexit/BoE policy-driven trends
- AUD/USD: Commodity-correlated; China demand sensitivity
- USD/CAD: Oil price correlated
- USD/CHF: Safe-haven dynamics
Avoid highly correlated pairs simultaneously (e.g., EUR/USD and GBP/USD during aligned macro moves) — this violates the diversification principle central to the Turtle System.
Practical 55-Day Channel Setup
Most charting platforms allow you to set up the 55-day channel automatically:
On MetaTrader: Use the “Donchian Channel” custom indicator (available in the MT4/MT5 marketplace) set to a 55-period lookback. The upper band shows the 55-day high; the lower band shows the 55-day low.
Alert setup: Set price alerts at the current 55-day high and low for each pair. When price touches the alert, receive a notification to evaluate the entry.
This ensures you never miss a valid System 2 breakout signal simply because you weren’t watching the screen.
The risk management in forex guide provides the complete framework for sizing and managing positions in a multi-market Turtle-style system.
Turtle Trading Backtest Results: What the Data Shows
Multiple independent researchers have backtested Turtle-style systems on modern forex and futures data. Key findings:
System 2 (55-day) consistently outperforms System 1 (20-day) in modern markets. The shorter System 1 generates too many false breakouts in today’s algorithmic market environment, creating excessive whipsaw. System 2 captures fewer but higher-quality trends.
The system works best across 10+ uncorrelated markets. Trading only 1-2 markets produces highly variable results. True diversification across 6-8+ uncorrelated instruments smooths the equity curve dramatically.
Maximum drawdown is typically 20-30% in the best backtest periods. Turtle traders must psychologically prepare for and survive extended drawdown periods — which historically last 6-18 months before the system makes new equity highs.
Worst conditions: Low-volatility, range-bound markets (2004-2007 calm period, some 2010-2012 periods). Best conditions: High-trend, volatile markets (1987-1989 original period, 2008-2009, 2022 trend year).
Key Turtle Trading Reference Data
Feature | System 1 | System 2 |
Entry signal | New 20-day high/low | New 55-day high/low |
Exit signal | New 10-day high/low | New 20-day high/low |
Stop-loss | 2 × ATR | 2 × ATR |
Filter | Skip if last trade was a winner | No filter |
Pyramid adds | Up to 4 units (every 0.5 × ATR) | Up to 4 units (every 0.5 × ATR) |
Max per market | 4 units | 4 units |
Risk per unit | ~1% of account | ~1% of account |
Expected win rate | 30-40% | 30-40% |
Best in | Strong trending markets | Strong trending markets |
Conclusion
The Turtle Trading Strategy is one of the most important trading systems ever documented — not because it is perfect, but because it demonstrates with rigorous real-world evidence that systematic, rules-based trading with disciplined risk management can generate exceptional returns across multiple market cycles.
Its legacy goes beyond the specific 20-day and 55-day breakout rules. The deeper lessons are enduring: cut losses mechanically, let winners run as far as the trend will carry them, size positions based on volatility and account risk, diversify across uncorrelated markets, and never override the system based on fear, greed, or impulse.
These principles are as valid today as they were in 1983. The trend-following logic that drove the Turtles’ $175 million in profits is the same logic that drives modern systematic hedge funds generating billions annually.
The question for any trader is not whether these principles work — decades of evidence confirm they do. The question is whether you have the psychological discipline to apply them consistently when 60-70% of your trades are losing, and whether you can sit through periods of drawdown without abandoning a system whose edge only manifests over many hundreds of trades.
Apply proper risk management, study technical analysis foundations, and if you pursue algorithmic implementation of turtle-style systems, understand quantitative trading principles that modern systematic traders apply. The Turtle rules are public — execution is what separates those who profit from those who don’t.
Frequently Asked Questions (FAQ)
Who created the Turtle Trading Strategy?
The Turtle Trading Strategy was created by Richard Dennis and William Eckhardt, two legendary Chicago commodity traders. In 1983, Dennis recruited and trained 23 ordinary people (called “Turtles”) to prove his systematic trend-following system could be taught to anyone. The Turtles collectively generated over $175 million in profits, validating Dennis’s belief that trading could be systematically taught.
What are the exact Turtle Trading entry rules?
System 1: Buy at a new 20-day high; sell at a new 20-day low. Skip if the previous System 1 trade was a winner. System 2: Buy at a new 55-day high; sell at a new 55-day low. No filter — all signals taken.
What is the Turtle Trading exit rule?
System 1: Exit longs on a new 10-day low; exit shorts on a new 10-day high. System 2: Exit longs on a new 20-day low; exit shorts on a new 20-day high. Both systems also use a hard stop-loss of 2 × ATR from the entry price.
What is the win rate of the Turtle Trading Strategy?
The Turtle Trading Strategy has a win rate of approximately 30-40% — meaning the majority of individual trades are losers. Profitability comes from the winners being substantially larger (often 5-10 times the loss on losing trades). This positive expectancy requires psychological discipline to execute — most traders cannot tolerate 60-70% losing trades even when the system is profitable overall.
Is the Turtle Trading Strategy still profitable today?
The core principles (trend following, breakout entries, ATR-based risk management, pyramiding into winners) remain valid and are used by systematic hedge funds. The exact original parameters (20/55-day channels) require adjustment for modern markets with increased algorithmic false-breakout activity. Traders applying System 2 (55-day) with proper position sizing have found it more reliable in recent decades than System 1.
What markets does the Turtle Strategy work best in?
The Turtle System works best in strongly trending markets: commodities (crude oil, gold, natural gas), forex pairs sensitive to macro cycles (USD/JPY, AUD/USD), and equity indices during clear bull or bear market cycles. It underperforms in range-bound, choppy markets where breakouts frequently fail.
Why is it called the “Turtle” Trading Strategy?
Richard Dennis reportedly named his trainees “Turtles” after visiting turtle farms in Singapore. He imagined growing traders the way turtle farmers grow turtles — from scratch, using a systematic process rather than relying on innate talent. The name stuck when the story became public in the 1990s.
How much capital do I need to trade the Turtle System?
The Turtle System’s position sizing requires capital sufficient to take meaningful positions across multiple markets simultaneously while respecting the 1% risk-per-unit rule. For futures markets, $100,000+ is typically the minimum for diversified implementation. For forex CFDs (where position sizes can be fractionalised), the system can be adapted for smaller accounts — though reducing the number of markets traded simultaneously as account size decreases.
What is the difference between System 1 and System 2?
System 1 uses 20-day highs/lows for entry and 10-day highs/lows for exit — shorter-term, more signals, more false breakouts, includes a “skip if last signal was a winner” filter. System 2 uses 55-day highs/lows for entry and 20-day highs/lows for exit — longer-term, fewer signals, better trend capture, no filter. System 2 is generally considered the more reliable of the two.
Can the Turtle Strategy be automated?
Yes — the Turtle System’s completely mechanical rules make it highly suitable for algorithmic implementation. The entry rules (new N-day high/low), exit rules (new M-day high/low), ATR-based stop-losses, and pyramiding logic can all be coded precisely. Many algorithmic traders have implemented Turtle-style systems as the foundation of automated trend-following strategies. Our guide on quantitative trading in forex explains how systematic strategies like the Turtle System are built and deployed algorithmically.