I see quite often different robots being developed to trade on any currency pair. However, they’re never made or tested on all pairs. Typically there’s only one currency pair and it’s made and tested on that. But traders still use it on random currencies and see absolutely different results. However, I I suspect it only makes sense to have a EA created for one pair and trade with it on that one special pair all of the time.

That’s what Forex Brilliance developers think too and they have created a suit of expert advisors that trade on explicit major pairs. There’s no confusion as to what to trade it on and on which currency pair it should work better. I think more developers should use this practice.

Not only that, when you’re trading manually, you should consider that for your manual system as well . It is a mere matter of chance, once you test and tweak a system on one pair, it’s likely to perform better on it. Naturally, I do not say that there are no systems that are universal, but it’s’s lots more difficult to make and run such a system.