The fifth winner in a row closed at 3:47pm on a Thursday. I remember the time because I screenshot the P&L and sent it to a mate with the caption "cracked it." I hadn't cracked anything. I'd caught a trending market with a momentum setup that a labrador could have traded profitably that fortnight. I did not know that yet.
What I did next was the mistake. I doubled my position size. Not because my edge had improved — it hadn't. Not because volatility had dropped — it hadn't. Because five wins felt like evidence of something. It felt like confirmation that my read on the market was sharper than usual. Mark Douglas calls this the most dangerous moment in trading: when random outcomes start feeling like feedback on your ability.
The setup on trade six was identical to the previous five. Same pattern, same timeframe, same entry trigger. But the market had quietly shifted regime — momentum was fading, the trend was exhausting itself. My process hadn't changed. My size had. The loss on that single trade erased three of the previous five winners in one hit.
The root cause wasn't greed in the abstract. It was a specific cognitive error — I treated a sequence of outcomes as data about my skill, when probability theory suggests streaks of five occur regularly in any system with a 50% win rate. Douglas's framework in Trading in the Zone is precise on this: the market doesn't know your last trade. Each event is statistically independent. Understanding gambler's fallacy helps explain why humans misread streaks in both directions, and the broader concept of randomness in sequential outcomes makes clear why five wins tells you almost nothing about trade six. The rule I wrote that evening: position size is set by the strategy, not the scoreboard. A tighter lens on position sizing methodology would have kept me at standard size regardless of recent results.
The market will manufacture enough confidence to make you stupid at exactly the wrong moment. Your only protection is a rule written before the streak started.
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