It's basically a headstart for the other team, so if we win 2-0 he gets a payout but if we were to win 1-0 or 2-1 he won't because, as far as the bet is concerned, we've drawn 1-1/2-2
They'll sit back and it will be a frustrating game until we finally find a way through late in the first half or early in the second, at which point the game will open up a bit and we'll go on to win 3-0