I see quite often different expert advisors being created to trade on any currency pair. However, they’re never made or tested on all major pairs. Typically there’s just one pair and it’s made and tested on it. But traders still use it on different currencies and see totally different results. However, I I believe it is only sensible to have a expert advisor made for one currency pair and trade with it on that one actual pair all of the time.
That is what Forex Brilliance authors think too and they have created a suit of robots that trade on specific currency pairs. There’s no bafflement as to what to trade it on and on which currency pair it should work better. I suspect more developers should use this practice.
Not only that, when you’re trading manually, you should consider that to be true for your manual system also. It is a mere matter of chance, when you test and modify a system on one currency pair, it’s likely to perform better on it. Of course, I do not say that there are no systems that are universal, but it is’s lots more difficult to create and run such a system.