[stouset]

It’s also stunningly easy to convince yourself you have a profitable algorithm when you actually have a money loser.

Gaining 0.5%/day 60% of the time and breaking even 39% of the time looks great until you run into the 1% of the time where you lose 50%.

[_zkyx]

Yes, 100%. Like I said in the article there. I once lost like 40% in a few minutes in the pre-market because my app didn't have the correct sell logic. Honestly, I don't even know if I had the correct logic that would have even saved me, because the market was falling so quickly I probably could not have even for the fills I wanted. So, I've moved to breaking things into tons of small bets and really trying to manage risk.