It Collapsed Overnight — The Lie of a Single Line of Code

It collapsed overnight.

 

For the past few months, I’d been building up a small business of my own.

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 simulated live-trading checks, the profits came in steadily, and the curve climbed without a single wobble.

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

 

And yet all that solidness was standing on a single line of code.

 

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The Line That Stopped at -95%

There’s this thing called backtesting.

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 a kind of wind-tunnel test to gauge “how would this strategy have done over the last five years?”

 

Somewhere in my backtest code, there was a single line that capped the daily loss at -95%.

It looked like a harmless safety measure. The trouble was twofold.

 

First. In the real world, if a leveraged position falls to -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, brought the position back to life. A strategy that should have died kept resurrecting itself like a zombie, every single day.

 

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

Losses blocked, gains wide open — it was asymmetric.

 

The undying zombie would occasionally clock an absurd spike of something like +1,786% in a single day. A phantom number, born on paper as the capital blew past zero into the negative and then drifted back up near zero again.

Those phantoms compounded, piling up and up — until they became the fantasy report card of “+107% a year.”

 

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

 

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The Real Numbers

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

Liquidation as liquidation, costs as costs, honestly.

 

 

In terms of return relative to risk, it was a result worse than just buying a single index fund.

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

 

Admitting this was the hardest part.

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

 

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Still, What I Can Be Grateful For

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

 

When the tool I’d been using got bumped up a version, that one asymmetric line caught my eye.

It was still the simulation stage, so the money I actually lost was zero. Where the illusion broke, there was no debt left behind — only realization.

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

 

And one more thing. Not everything collapsed.

 

Of the two bots, the one that traded US stocks passed the honest verification.

In 2022, when the market was caving in, it actually held on at +13% — a thing with real defensive power.

What collapsed was the flashy one; what survived was the plain one. As always.

 

But the rest — the 80% I’d labored over most, the flashiest part — lost its use.

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

 

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Again

Run a business long enough and a collapse like this will come again.

I’ll keep learning, this expensively each time, that the flashy thing is the lie and the plain thing is the real one.

 

Still, if this is 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.

A difficulty like this is part of a road I can’t avoid.

Honestly, these were the most sunken few days I’ve had in a while.

 

And yet — I get to start again on real numbers instead of an illusion.

Maybe that’s the most expensive and most honest gift this collapse has given me.

 

I steady my heart again.

Let’s try again.

 

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