Treat it as 4-3(shifted)-3, i would say attack his left (your right) flank
When you choose to pass down one flank - does left/right mean their left/right flank or yours? I've always assumed it meant yours, but I'm not sure, and it could make a difference in a few cases each season.
FC Bristbury
Season 5, Level 5
League Winners Levels: 1, 2, 3 & 4
Champions League Winners Levels 2 & 3 Double X 2 (League and Champions League), Levels: 2 & 3