I've been reading about triangular arbing and was surprised to find that the cross of two majors doesn't always equal what the calculation would suggest it should. I would have thought that brokers would offer the cross as a direct calculation of the two so that arbitrage opportunities wouldn't exist. From what I have read at least at some point in history this wasn't the case.

This immediately gave me the idea of buying gbpusd and selling eurusd, so taking a short position in eurgbp but hedging that trade with a long in eurgbp itself. Should the rate offered for the cross go out of skew with the calculation of eurusd + gbpusd then there would be a risk free profit opportunity.

Does anyone have any experience of trading this way, is this still possible and is my idea feasible? Thanks.

This immediately gave me the idea of buying gbpusd and selling eurusd, so taking a short position in eurgbp but hedging that trade with a long in eurgbp itself. Should the rate offered for the cross go out of skew with the calculation of eurusd + gbpusd then there would be a risk free profit opportunity.

Does anyone have any experience of trading this way, is this still possible and is my idea feasible? Thanks.