It Fell Apart Overnight. The Lie in a Single Line of Code

It fell apart overnight.

 

For the past few months, I’d been building a small business, one piece at a time.

Strategies that read the market and bought and sold on their own — bots I’d built myself.

 

All through May, the report card was solid.

Even in the paper-trading validation I ran against live conditions, the profits came in steadily, and the curve climbed upward without a wobble.

I thought I was almost there. That all that was left now was to put in real money.

 

But all that solidity was standing on a single line of code.

 

---

The One Line That Stopped at -95%

There’s a thing called a backtest.

It’s a simulation where you run a strategy over past data ahead of time. Before you bet real money on the future, it’s like a wind-tunnel test to gauge “how would this strategy have done over the last five years?”

 

Somewhere in my backtest code, there was a line that clamped each day’s loss so it stopped at -95%.

It looked like a harmless little safety measure. The problem was twofold.

 

First. In reality, when a leveraged position falls -95%, that’s liquidation. It’s over.

The account blows up and the game ends.

But my simulation stopped the loss right at that point, and the next day it brought that position back to life. A strategy that should have died rose again every day like a zombie.

 

Second. That line capped losses at -95%, while it left gains open to infinity.

An asymmetry: losses blocked, gains left wide open.

 

Every so often, the undying zombie would print an absurd spike like +1,786% in a single day. A ghost number, born on paper as the capital blew past negative and then drifted back near zero.

Those ghosts compounded, stacking up and up — until they became a fantasy report card that read “+107% a year.”

 

And for months, I believed that report card was real.

 

---

The Real Numbers

I stripped out that one line and ran it again, the way reality works.

Liquidation as liquidation, costs as costs, honestly.

 

 

Measured by return against risk, it was a result that wasn’t even as good as just buying an index fund.

The strategy I’d poured months into, it turned out, had not a single thing that was better than the market.

 

Admitting this was the hardest part.

It wasn’t that I’d been wrong — it was that the distance I’d run while believing I was right, wrong all along, had gotten so long.

 

---

Still, What I’m Grateful For

The saving grace is — I found this before I put in real money.

 

When the tool I’d been using got an update, that one asymmetric line came into view.

Since I was still in the paper stage, the money I’d actually lost was zero. Where the illusion broke, there was no debt left behind — only a realization.

A few days later and I’d have trusted those zombies with my own money.

 

And one more thing. Not everything fell apart.

 

Of my two bots, the one that handled US stocks passed the honest validation.

It was a bot with real defensive power — in 2022, as the market crumbled, it actually held on at +13%.

What fell apart was the flashy one; what survived was the plain one. As it always goes.

 

But the rest — the 80% I’d worked hardest on, the flashiest part — lost its usefulness.

In the end, I have to build the strategy again, almost from scratch.

 

---

Again

Do this long enough, and collapses like this will surely come again.

That the flashy is the lie and the plain is the truth — I’ll probably keep learning it this expensively, every single time.

 

Still, if it’s something I can do, and want to do, then there’s no choice but to carry even that one-line lie along with me.

 

There are still six months left.

Difficulty on this scale is just part of a road you can’t avoid.

Honestly, these have been the lowest few days I’ve had in a while.

 

But that I get to start over on real numbers instead of an illusion —

maybe that’s the most expensive and most honest gift this collapse gave me.

 

I steady my heart again.

Let’s try again.

 

It’s not that the strong survive the longest — it’s that those who survive the longest are the strong.