You are looking for arbitrage, not in real terms, and you may loose heavily. Big banks would suck out all profit before you get a chance to react. There are thousands of algorithmic trading systems in banks, which specifically predict such situations and try to make money from such moves. If you can invest in such a system, probably you can make a killing, else best is to forget about it. Remember that somebody before you has surely thought about it and put a system in place, so that somebody else cannot make money out of it before he/she does.

You are looking for arbitrage, not in real terms, and you may lose heavily. Big banks would suck out all profit before you get a chance to react. There are thousands of algorithmic trading systems in banks, which specifically predict such situations and try to make money from such moves. If you can invest in such a system, probably you can make a killing, else best is to forget about it. Remember that somebody before you has surely thought about it and put a system in place, so that somebody else cannot make money out of it before he/she does.