Five rules that prevent blow-ups
Here's something that surprises every beginner: almost nobody blows up their account because of a bad prediction. They blow up because, in a bad moment, they broke a rule they already knew. The catastrophe is never the trade — it's what they did around the trade.
This lesson is a short, blunt rulebook: five non-negotiable rules that make a blown-up account nearly impossible. They're not clever. They're guardrails — and guardrails are boring right up until the moment they save your life.
A single losing trade, sized correctly with a stop, costs you 1% — a scratch. To turn that scratch into a fatal wound, you have to do something: remove the stop, pile on more shares, double down, or trade in a rage to win it back. Every account-ending disaster is a chain of those choices. Which is the good news, because it means blow-ups are almost entirely self-inflicted and entirely preventable. You cannot control whether a trade wins. You can completely control whether you follow the five rules below.
- Always use a stop — and never widen it.Every trade gets a hard stop set before entry. You can trail it in your favor; you may never move it away. This caps every loss at −1R. (6.2)
- Risk a fixed small percent (≤1–2%) — never oversize.Size by risk, not by how many shares you can afford. This is what lets you survive any losing streak. (6.3)
- Never average down into a loser.Adding shares to a losing trade to "lower your average" just enlarges a loss you already decided was wrong. If it hit your stop, you were wrong — don't buy more of wrong. (new)
- No revenge trading — obey a daily loss limit.After a loss, the urge to "make it back now" leads to oversized, planless trades. Set a stop-for-the-day (e.g. after −3R or two losses) and walk away. (7.1)
- Cap your total risk across all open trades.Ten 1% trades that move together are one 10% bet. Limit total simultaneous risk (≈5–6%) so no single day can gut you. (6.3)
Notice how little of this is about being a good analyst. Not one rule helps you pick better trades — they exist purely to make sure a bad run, or a bad mood, can't end you. That's the point. A brilliant chart reader who breaks these blows up; a mediocre one who keeps them survives to slowly get better. Survival, again, beats being right.
Each rule kills a specific, well-known account-killer. No stop is how a −1% loss becomes a −40% hole. Oversizing is how a normal losing streak becomes a wipeout. Averaging down is the "it has to bounce eventually" trap that has destroyed more accounts — and more famous funds — than any other single behavior. Revenge trading is how one bad trade snowballs into ten worse ones in an afternoon. And uncapped total risk is how a trader who "only risks 1% per trade" loses 15% in a day because all their positions were really the same bet. Keep the five, and every one of those doors is closed.
Watch how a blow-up actually happens — not one bad trade, but a cascade of broken rules turning a scratch into a crater:
the anatomy of a blow-up · every step is a broken rule, not a bad forecast
These rules are trivial to understand and genuinely hard to follow — because they always demand the most from you at the exact moment you're least able to give it. You break a stop when you're scared; you average down when you're in denial; you revenge-trade when you're angry. Knowing the rule does nothing if emotion overrides it in the moment, which is why the very next module is entirely about managing yourself. The rulebook is the what; the discipline to obey it is the how, and it's the harder half.
Two more honest notes. The rules will feel too conservative when you're winning — "if I'd just sized up, I'd have made double." That thought is the seduction that precedes almost every blow-up; the rules matter most precisely when you feel invincible enough to bend them. And no rulebook removes all risk — a gap or a genuine shock can still hurt you (that's the next lesson). But these five close the door on the self-inflicted disasters, which are the overwhelming majority. Write them down where you'll see them; a rule kept only in your head bends under pressure, and pressure is exactly when you'll need it not to.
That's the guardrail set. Combined with the machinery from the last three lessons — stops, sizing, R — you now have a complete system that keeps a single trade, a single streak, or a single bad mood from ever taking you out. There's just one risk left that a stop genuinely cannot protect you from, because it strikes while you're not even watching: the overnight gap. That's where this module ends, and it's the last piece of staying alive.
Open the Lab and write these five rules where you can see them. Then run a bad day on purpose: take a losing trade and, instead of accepting the −1R, deliberately break the rules — average down, move the stop, revenge-trade to win it back. Watch how fast a scratch becomes a crater. It's free here; it's your account out there.
Then do the same bad day the right way: take the loss, honor the stop, hit your daily limit, and stop trading. Notice you're barely down and completely fine. Feeling both versions back to back — the cascade and the calm — is what turns these five rules from words on a page into reflexes you'll actually keep when real money is on the line.
Open the Lab →- Blow-ups are broken rules, not bad trades — almost always self-inflicted, and therefore preventable. A correctly-sized loss is just a 1% scratch.
- The five: always use a stop (never widen), risk a fixed small %, never average down, no revenge trading (daily loss limit), cap total open risk.
- They're simple to know and hard to follow under emotion (that's Module 7), and they feel too strict when you're winning — which is exactly when they matter most. Write them down.