I see quite often different robots being created to trade on any pair. They’re never developed or even tested on all currency pairs. Typically there’s only one currency pair and it’s created and tested on it. But traders still use it on different currencies and see totally different results. However, I I suspect it only makes sense to have a robot made for one currency pair and trade with it on that one special pair all the time. That’s what Forex Brilliance developers think too and they have developed a suit of expert advisors that trade on particular major pairs. There’s no bafflement as regards what to trade it on and whether it should work better on one currency pair or another. I believe 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’s a matter of chance, after you test and modify a system on one major 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 a lot more difficult to create and run such a robot.