Tell me about a trading mistake that left the deepest impression on me.

It was when I had just started building quantitative systems.

The system gave a short signal. I glanced at it and thought, “That’s the wrong direction,”
so I didn’t take the trade.

It turned out that if I had taken it, the profit would have been 4R.

Even worse, later I used my “own judgment” to go long,
and got stopped out.

That day taught me one thing:
I designed a system because I don’t trust my own intuition.
If I don’t trust the system, what’s the point of having one?

From that day on, I stopped overriding the system’s signals.

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