← Back to Blog · 2026-09-03 · 5 min read · Strategy Case Study

Imagine watching a market go limit up for days. You are either sweating bullets because you are short, or you are kicking yourself because you missed the entry. For global retail traders, the 2021 China thermal coal rally was the ultimate stress test of a trading system.

It was a market environment where fundamentals, logistics, and exchange interventions collided. For trend followers, it was a goldmine on the way up—and a minefield on the way down. Today, we are going to break down exactly how a classic trend following strategy navigated this historic move, looking at the raw mechanics, the contract specs, and the brutal reality of risk management.

The Setup: The 2021 Power Crunch and the Trend

In 2021, China's post-pandemic industrial recovery was running at full steam, driving massive electricity demand. At the same time, domestic coal supply faced logistical bottlenecks and safety inspections. The result was a historic supply crunch in thermal coal.

Prices surged from roughly 600-700 RMB per ton earlier in the year to unprecedented peaks around 1,900-2,000 RMB per ton by the autumn. It was a textbook, parabolic trend. But as any experienced trader knows, parabolic trends eventually break, often violently. After hitting those highs, exchange interventions—ranging from drastic margin hikes to strict position limits—triggered a rapid and severe collapse back toward more normalized levels.

A trend follower's job isn't to predict the top or the bottom. It’s to ride the wave, manage the heat, and get out when the market tells you the trend is dead.

The Contract Specs: Why Math Matters Before the Entry

If you want to trade Chinese commodity futures, you cannot treat every contract the same. The thermal coal futures (code: ZC) are listed on the Zhengzhou Commodity Exchange (ZCE). Before you even think about a breakout strategy, you need to know the exact math of what you are trading.

Why does this matter? Because a 100 RMB price move on one lot of ZC equals a 10,000 RMB change in your account equity. When the market is moving 100 RMB in a single session, your position sizing has to account for that volatility. If you are used to trading micro lots in forex, the leverage and tick value in China futures will humble you very quickly if you skip the math.

Entering the Beast: Breakout Rules and ATR Sizing

Let’s look at how a standard trend following system would have engaged this market. We are not talking about discretionary chart reading; we are talking about rigid, algorithmic rules.

The 20-Day Donchian Breakout

A classic entry trigger is the 20-day Donchian Channel breakout. The rule is simple: if the price closes above the highest high of the previous 20 days, you go long. During the 2021 rally, thermal coal was breaking these highs repeatedly. Every breakout was a valid entry signal.

However, entering is the easy part. The challenge in a market that goes limit up is slippage. In China futures, if a contract locks limit up, you physically cannot buy it. A trend follower might have received a signal to buy on Tuesday, but couldn't get filled until Thursday when the limit finally broke. This is a reality of trading these markets—you must accept missed entries.

Position Sizing via ATR

To survive the 2021 thermal coal spike, position sizing was everything. A robust system uses the Average True Range (ATR) to measure volatility. The rule: risk no more than 1% to 2% of your account equity per trade.

Let’s say the 20-day ATR for thermal coal was 50 RMB. Since the multiplier is 100 tons/lot, the daily volatility per lot is 5,000 RMB. If your account is 100,000 RMB and you want to risk 1% (1,000 RMB), you cannot simply trade one lot, because a normal volatility day would wipe out 5% of your account.

Instead, you size down. You might only be able to trade a fraction of a lot, or you might have to skip the trade entirely if the minimum position size creates too much risk. This is the unglamorous reality of risk management. It keeps you in the game when the market inevitably reverses.

The Exit: Surviving the Regulatory Whiplash

The real test of a trend follower in 2021 wasn't the entry; it was the exit. When the National Development and Reform Commission (NDRC) and the ZCE intervened to cool the market, they didn't just use words. They raised margin requirements drastically—sometimes to 50% or higher—and implemented strict trading limits. The market crashed.

A trader relying on a 10-day Donchian low for a trailing stop would have been aggressively pushed out of the market. If the price broke the lowest low of the previous 10 days, the system flattens the position. No questions asked. No hoping for a bounce.

Alternatively, a trader using a 2x ATR trailing stop would have seen their stop dynamically widen as volatility exploded on the way up. When the market reversed, the wide stop would have prevented getting stopped out by normal noise, but once the 2x ATR threshold was breached, the exit would have been triggered. The profit taken from the parabolic move would have vastly outweighed the give-back at the end.

Practical Application for Global Traders

The thermal coal spike is an extreme example, but the underlying mechanics apply across the board when you trade Chinese commodity futures. Whether you want to trade rebar/iron ore, copper, or soybeans, the structural rules of trend following remain the same.

• Know your multipliers: Iron ore on the Dalian Commodity Exchange (DCE) has a multiplier of 100 tons/lot. Rebar on the Shanghai Futures Exchange (SHFE) has a multiplier of 10 tons/lot. Never assume the risk profile of one contract matches another.
• Respect exchange rules: China futures exchanges will actively change margin rates, limit up/down thresholds, and position limits during extreme volatility. Your system needs a buffer for these sudden rule changes.
• Embrace volatility sizing: Fixed lot sizing will get you killed in trending markets. You must scale position size inversely to volatility (ATR). If the market is moving 10% a day, your position size must shrink accordingly.
• Accept imperfection: You will miss entries due to limit moves. You will give back profits on trailing stops. That is the cost of doing business as a trend follower.

The traders who survived and profited from the 2021 thermal coal spike weren't necessarily the smartest analysts. They were the most disciplined executors of a mechanical system. They sized down when volatility spiked, rode the trend while it lasted, and aggressively cut the position when the market structure broke.

Test Your System in a Real-Data Environment

Reading about trend following is easy. Executing it when a market is going limit up or limit down is incredibly difficult. If you have a mechanical strategy for China futures—whether you trade rebar/iron ore, agricultural products, or energy chemicals—you need to test your execution and risk management under pressure.

At XS Select, we provide a real-data China futures evaluation platform designed specifically for global retail traders. You can test your trend following system, prove your risk management skills, and see how your strategy handles real market mechanics without risking your capital upfront. You can start an evaluation from just $29. Build your system, test your rules, and see if you have the discipline to navigate the next big trend.