← Back to Blog · 2026-10-26 · 5 min read · Strategy Case Study

If you were trading Chinese commodity futures in late 2021, you likely experienced the visceral fear of being on the wrong side of a market moving faster than your stop-loss could execute. The thermal coal market on the Zhengzhou Commodity Exchange (ZCE) didn't just trend; it exploded. For many retail traders, this was a lesson in humility. For systematic trend followers, it was a stress test of volatility scaling and position sizing rules.

This case study dissects that specific event not to relive the pain, but to extract the mechanical logic that separates surviving systems from blown accounts. We will look at how a standard trend-following framework handled the 2021 thermal coal short squeeze, focusing on contract mechanics, risk parameters, and execution realities.

The Market Context: Why Thermal Coal Became a Monster

To understand the strategy, you must understand the asset. Thermal coal (contract code TC) is traded on the ZCE. It is a high-volatility, politically sensitive commodity heavily influenced by domestic energy policies and supply chain bottlenecks.

In late 2021, a perfect storm hit. Supply constraints from domestic safety inspections collided with surging demand as global energy prices spiked. The result was a parabolic rally. For trend followers, this looked like a golden opportunity. For mean-reversion traders, it was a graveyard. But even for trend followers, the sheer velocity of the move exposed weaknesses in static position sizing models.

Key contract specs you need to know for context:

• Exchange: Zhengzhou Commodity Exchange (ZCE)
• Contract Size: 100 tonnes per lot
• Tick Size: 0.2 CNY per tonne
• Value per Tick: 20 CNY
• Margin Requirements: Highly variable; exchanges often increased margin requirements dynamically during this period to curb speculation.

The Failure of Static Risk Models

Most retail trend-following strategies rely on a fixed percentage risk per trade (e.g., risking 1% of account equity per position). In a stable market, this works. In the 2021 coal squeeze, it failed catastrophically for those who didn't adjust for volatility.

As prices accelerated, the average true range (ATR) expanded dramatically. If your stop-loss distance is based on a static number of points or a fixed ATR multiple that doesn't update frequently enough, your position size effectively shrinks as volatility spikes. However, if you maintain fixed lot sizes regardless of expanding volatility, your dollar risk per trade explodes.

Consider the math: If a trader holds 10 lots of thermal coal with a stop-loss 100 points away, a 100-point move against them costs 20,000 CNY. If the market gaps or moves 500 points in a day due to policy news, that loss becomes 100,000 CNY instantly. In 2021, daily moves of 5-8% were not uncommon for coal. Static models couldn't keep up.

How Successful Trend Followers Adapted

The traders who survived—and profited—didn't guess the top. They adjusted their mechanical rules to accommodate the new volatility regime. Here are the three critical adaptations that defined successful trend-following execution during this period.

1. Volatility-Adjusted Position Sizing

Instead of trading a fixed number of lots, successful systems calculated lot size based on current volatility. The formula is simple but essential:

Position Size = (Account Equity × Risk %) / (ATR × Multiplier × Tick Value)

As the ATR for thermal coal spiked, the denominator increased, automatically reducing the number of lots traded. This ensured that each trade represented roughly the same dollar risk, regardless of how wild the market had become. Traders who failed to scale down their lot sizes found themselves overexposed when the market inevitably corrected or when liquidity dried up.

2. Trailing Stops and Dynamic Exits

Static profit targets became irrelevant in a parabolic move. The strategy shifted from "take profit at X" to "trail the stop." Many trend followers used a chandelier exit or a moving average crossover (e.g., price closing below the 10-day EMA) to signal exit.

However, the 2021 coal rally featured violent intraday reversals. Tight trailing stops often got triggered by noise, leading to premature exits and "whipsaw" losses. The solution? Wider volatility-adjusted stops combined with a time-based exit rule. If the trend continued for a set period without a significant drawdown, the stop was widened further to allow the trend to breathe.

3. Respecting Exchange Intervention Risks

This is unique to China futures. The regulatory environment is active. During the coal squeeze, the Chinese government intervened directly, calling for increased supply and warning against speculation. This led to sudden changes in margin requirements and trading limits.

Successful traders monitored exchange announcements daily. When margins were raised, they reduced leverage immediately. When trading limits were imposed (capping the number of open lots per account), they adjusted their portfolio allocation. Ignoring these regulatory signals was a fatal error. A trend-following system that doesn't account for exogenous regulatory risk is incomplete in the Chinese market.

Practical Application: Building a Robust Coal Strategy

If you want to trade Chinese commodity futures using trend following, you need a framework that handles the "black swan" events like the 2021 coal squeeze. Here is a practical checklist for your strategy:

Entry Logic

Don't just buy breakouts. Use confirmation. For example, enter long only if:

• Price closes above the 20-day high.
• Volume is above the 20-day average volume.
• Open interest is increasing (indicating new money entering the trend).

In the 2021 rally, volume and open interest surged alongside price. This confirmed the trend was genuine, not just a short squeeze driven by panic buying.

Risk Management Rules

Implement hard rules before you trade:

• Maximum Drawdown Limit: Stop trading the specific contract if drawdown exceeds 5% of allocated capital.
• Volatility Cap: If ATR exceeds 3x its 3-month average, reduce position size by 50% or stop trading that instrument entirely.
• Correlation Check: Thermal coal is correlated with coking coal and coke. Don't overexpose your account to the entire coal complex.

Execution and Slippage

In high-volatility periods, liquidity can evaporate. Market orders are dangerous. Use limit orders for entries and exits where possible. However, recognize that in a true squeeze, you may not get filled. This is why position sizing is more important than entry precision. If you can't get filled, you miss the trade. That is acceptable. Blowing up your account chasing a fill is not.

Lessons from the Squeeze

The 2021 thermal coal event was not a failure of trend following; it was a failure of risk management. The trend was clear. The profits were available. The losses came from traders who treated a high-volatility environment like a normal one.

Key takeaways for global traders looking at China futures:

• Volatility is a feature, not a bug. Your system must adapt to it dynamically.
• Regulatory risk is real. Monitor exchange announcements as closely as price charts.
• Liquidity can vanish. Never assume you can exit at the price you see on the screen.
• Position sizing is the only true edge. Entry signals are secondary to how much you risk.

Testing Your System Without the Fear

Reading about the 2021 coal squeeze is one thing. Implementing a robust trend-following system that handles such volatility is another. Many traders build strategies that look good on backtests but fail in live markets because they ignore execution slippage and margin changes.

You need to test your strategy against real-data China futures under realistic conditions. This means accounting for actual tick data, realistic slippage, and the specific margin requirements of the ZCE and SHFE.

At XS Select, we provide a futures evaluation platform designed specifically for Chinese commodity futures. We offer access to real-market data and rules that mirror actual trading conditions, allowing you to stress-test your trend-following logic against historical volatility spikes like the 2021 coal squeeze. It’s a practical way to validate your risk management rules before risking real capital, with evaluation plans starting from $29.

Trend following is not about predicting the future. It’s about surviving the present. The 2021 thermal coal market tested that survival. Did your system pass? If not, it’s time to refine your rules.