The problem with backtesting is it doesn't take into consideration the human element, the trader's emotions, and "information" collected from other sources, e.g., iHub, CNBC talk, eurozone issues, futures on the CME, etc.
Humans are messy information processors made of meat, not silicon gate computers.
The task is to keep things as simple as possible, practical, and prompt. Strive to stay on the right side of the market, use protection, stops, etc.
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