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I know very well what overfitting means. My test were all done this way: a) split the 5 years data-set into 3 parts. b) use ONLY 1/3 for learning process c) when ready use the second 2/3 for selecting the best strategies from set (b) d) keep 1/3 for a last test before going life.

This is true, and sadly: extremely hard to do. But I see (2) and (4) belonging to (5)...so actually 3 Golden Rules

3 full years I tested the most advanced strategies (special kind of Neural-nets included), and only thing I learned was that: a) noice in real-time historical data makes it hard to filter "general working strategies". b) the found "working strategies" gave nice statistics (more than 80%...

Also, I think you should ask Support for help. I always got fast and helpful answers. Although, You are right: phone support would be better, but I guess that because they are in the Netherlands, email works better.

I use ButtonTrader sometimes for Forex, and have to admit that, in the beginning I was confused as well. This is not b/c ButtonTrader but more due to the strange way IB has implemented Forex. You need to get rid of the idea of "contract trading", but think in Cash budgets and swapping one...