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Donchian Channels: The Simplest Breakout System in the Book

A Donchian channel plots the highest high and lowest low over the last N periods. The upper line is the highest high, the lower line is the lowest low, and the middle is their average.

Its logic is simple. If price makes a new N-period high, buy. If it makes a new N-period low, sell. Richard Dennis's Turtle traders famously used breakouts of 20 and 55 days in the 1980s as part of their system.

What it offers is clear rules, with no subjectivity. Everything is defined: entry on the breakout, exit on a shorter opposite breakout, and sizing by volatility.

The weakness is the behavior of breakout systems in general. They have a low win rate, often 30 to 40 percent, because many breakouts fail. They make money from the few that run far. That requires patience through a string of small losses, and it is psychologically difficult.

In forex, performance varies by era and pair. Strong trends in the past rewarded such systems, while choppier, mean-reverting conditions have hurt them.

It is a good educational tool. Building and testing a Donchian system teaches how trend following works, including the trade-off between win rate and payoff.

Practical step: plot a 20-period Donchian channel and count how many breakouts led to a 3R move versus those that failed.

A caveat worth knowing: pure Donchian breakout systems usually have low win rates and rely on a few big trends to pay for many small losses. If you can't sit through a long string of losing breakouts, the system will feel broken before it ever pays off. Before trading one, look at the worst losing streak in a backtest over several years and imagine living through it with real money. Runs of ten or more losses in a row aren't unusual for this kind of system. If that would make you quit, either use smaller risk per trade so the streak is bearable, or choose a method with a higher win rate that suits your temperament.

The exit side deserves as much testing as the entry. The original Turtle rules used a 10-day opposite breakout to exit the 20-day system, and changing that one number shifts the results far more than tweaking the entry length, because it decides how much of each big trend you keep. When you do the 3R count, also record how much open profit each winning trade gave back before the exit triggered. That give-back is the real price of the system, and seeing it in pips makes the low win rate easier to accept.