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Testing a trading system for robustness on MT5

I am convinced I may be overfitting my EA to historical data somewhat. Based on what I know, the methods available to test a system's robustness (and identify overfitting) in MT5 include: Using the built-in forward test/out-of-sample function in the strategy tester (and testing on other OOS data

Optimisation robustness and avoiding overfitting MT5

Context: This post is intended to be useful to those looking for ideas on how to set up an optimisation/setfile discovery process for themselves. Much more selfishly, I am also looking for advice from the more experienced on my optimisation process (which I will lay out below). I have been trading