Yesterday was ugly. The plan is the same.

The market crashed. The systems already had the answer. That is the entire point.

You probably saw what happened in the market yesterday.

I am not going to pretend it was not ugly. It was. Real selling, real damage, real red across nearly every name on the screen. My own account took the hit alongside it, because I had positions on. There is no system that wins every day, and anyone who tells you they have one is lying to you.

But I want to tell you what I did about it after the close.

Nothing.

I did not move stops. I did not exit early. I did not size up to “catch the bounce.” I did not size down to “be safer.” I did not stare at the overnight futures wondering whether to override what the system was telling me.

I read the numbers, I let the regime filter do its work, and I shut the laptop.

That is not because I am tough or zen or unusually disciplined. It is because the decisions for yesterday were already made.

The Investing system runs monthly. Its next decision is at month-end. Whatever happened yesterday gets baked into the rotation then, not now. The Swing Combo has its orders sitting at predetermined levels. If a stock hits its stop, it exits. If a name in the buy zone gets cheaper, the buy-limit fills cheaper. That is the system. The Day Trading system was flat by the close, which is the rule on every day, including this one. The regime filter on the broader market is what it is, and Monday morning it will be what it is, and either we are trading or we are sitting.

None of those decisions were mine to make yesterday. They were made the day I built the systems. Yesterday I just ran them.

This is the part of systematic trading that almost nobody talks about when they advertise backtests and CAGRs and Sharpe ratios. The headline number is not what makes the system valuable. The fact that the decisions are already made is what makes the system valuable. On a day like yesterday, when discretion is the worst possible advisor in your head, the systematic trader has nothing to override. There is no impulse to wrestle. There is the plan.

Will the systems take losses out of yesterday? Almost certainly. Some open swing positions will hit stops. Some monthly Investing names will be down meaningfully when month-end comes. If a system enters a real-time drawdown, The Drawdown Memo will go out, the way it always does.

That is already in the data. It is in the backtests I publish. The Starter System I gave away last week shows a 26 percent worst drawdown across 26 years, and the way you get to a 26 percent worst drawdown is through days like yesterday. The honest version of this work is that the drawdown is not a bug. It is the cost of the returns. You stay through it, the system keeps running, the math compounds. You quit during it, you lock in the worst of it and miss the recovery.

I will tell you what worries me much more than days like yesterday: not having a plan and getting hit by a day like yesterday. That is how retail accounts die. The system is the plan. Yesterday the plan ran. Monday it runs again.

Sunday Top 3 lands tomorrow at the usual time.

If you are running the Starter System yourself, or you are a Pro member running the full set, the message is the same.

Trust the rules you backtested. They were built for days like yesterday, not in spite of them.

Michael

Michael Nauss, CMT, CAIA, CDMS. Founder, Stats Edge Trading.