And what I didn't read in your post was duration of back test. Many only back test over past year, I back test using tick data going back fourteen years, many signals have over 30,000 sample size, what many will say it is way too far of testing, what some will say when trading their method is "testing never showed this much drawdown" cause like in baseball or other sports record, eventually extremes becomes a new record by someone else. I once was trading a Soybean system and tested it on three years of data, drawdown was $2,000, well, one year market went way beyond the norm and I was down $7,000 before it came back to profitable.
But when 9-11 happened and you didn't get out before exchanges closed, I believe it opened week later $3500 bucks down in ES? Way too many who are inexperienced trade on shoe string, if your experience does not equal your Trading Plan, odd occurrences will wipe you out.
I never backtest over more than 3 years because I think that in that period you will had almost all kind of markets. I also think that markets from years ago are not behaving like markets do now. Internet, lower margins, better possibilities for non professional to trade with decent software, HFT.... All these things have changed the behavior of the market. So to me it doesn't make sense to backtest data from years ago. But that's just my opinion and based on what I use to trade.
For me it is more important to built a self adapting system. A system that adapts itself to the markets. I think it gives better returns and better control over losses. A least if the system is built well.
About 9/11. People who stayed overnight are LT traders. If you watch the charts the trend was short, all indicators were short, so the drop only increased the profits. At 8/11 normally nobody should be LT long. The problem is not how big was the move, but what was your position at that moment according to your system? If markets crash 25% in the direction of my position, I have no problem with that. My experience is that most crashes happened with the trend, not against it.
The red arrow is just BEFORE 9/11.
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