There are sevaral ways to trade the high correlated currency pairs.
Top cahrt is EUR/USD, 2e chart is USD/CHF and 3e chart is EUR/CHF
The bottom chart shows you the daily moves of each curreny.
As we all know EUR/USD has the highest correlation with USD/CHF and to trade more or less safe we buy both pairs or sell both pairs and try to pick the small difference.
2x EUR/USD and 3x USD/CHF is actually EUR/CHF.
There are several ways to capture this small difference and so trade with less risk.
More to come later . . . . . .
Trading Forex in Baskets to diversify trading risk for both, speculative trading or hedging Forex risk by 

