Counterintuitive pattern we see constantly in prop firm eval data: traders don't usually blow accounts on their worst trade. They blow them on the trade right after their BEST trade.

Here's the mechanism:

1. You take a clean, rules-based entry. It works. You're up big for the day.

2. Your brain reclassifies "risk" — you just proved you can read the market, so surely you can size up on the next one.

3. You take a discretionary trade outside your plan, oversized, without the same filter that made trade #1 work.

4. That trade goes against you, and because you sized up, the drawdown eats several days of gains — or the whole eval.

This is why "just be disciplined" advice doesn't work — the failure isn't a discipline problem, it's a state-dependent one. You're a different trader after a win than after a loss, and eval accounts punish that variance hard because most firms cap daily/max drawdown in dollar terms, not percentage of current equity.

The only fix that actually works in practice: remove the sizing decision from your own hands after a win. Fixed contract size per setup, no discretionary adds, and a hard rule that a green day doesn't unlock bigger size until the eval is passed and you're trading firm capital.

This is literally the reason automation exists for eval accounts — not because algos "predict" better than humans, but because they don't get emotionally recalibrated by their own P&L. Worth auditing your last blown eval against this pattern — check what your size was on the trade immediately following your biggest win of that eval. We'd bet money it was bigger than your average.