Many traders have experienced this curse: a once-profitable trick suddenly backfires, and they end up losing heavily.

Pursuing the "sure-win rule" often leads to even deeper trouble—what exactly is going on?

The answer actually lies in the underlying logic of "profit and loss share the same source."

Most people see this concept and their first reaction is: "How can the same strategy both make money and lose?" In fact, this is the core. Being able to profit handsomely in a bull market with a certain method is precisely because that method implicitly contains assumptions about specific market conditions. When the market mood changes, cycles reverse, or volatility patterns switch, the same operational logic can turn from a sharp sword into a dull blade—not because the strategy is bad, but because it no longer matches the current market environment.

True trading experts don't seek a "perfect strategy," but understand that behind every profit model, there is a corresponding undercurrent of risk. Recognizing this allows you to survive longer amid market upheavals.