Could you take alook at the attached PDF and create an EA for the system. The RSI rules only apply to EURCHF, it is used as the trigger currency.
As the PDF mentions we need a negative correlation between USDCHF and EURUSD to be occurring for a successful trade to take place.
I've attached an indicator that might help, in addition to the PDF rules, I think trades should only occur when this indicator is below -0.5 in value.
If you have any other ideas for confirming the negative correlation condition please add them.