The 4-1-2-1-2 Narrow Diamond is one of the formations I hate playing against and 4-4-2 doesn't normally work against it,

Edit, Oh your playing against 4-4-2? Then 4-1-2-1-2 narrow diamond should be fine against 4-4-2, I'd put focus through the middle though since the 4-1-2-1-2 diamond is set-up to play through the middle.