jus, exactly as duck said it, your rationale for a so to speak "cover" bet (although cover bets are 99% of the time a big no, no because you are paying twice the vig for the same eventuality, and if you are right and you have the edge in both main and cover bet, which is rare, so be it, but if you are getting shortpriced in both then you are dooming yourself for no good reason) would only justify the under here at about 2.3 at the moment, meaning that you would be aiming for a clear 2-0 win for olympiakos, to win both bets, and covering for a low scoring draw or a 1-0 Oly win, making a small profit only if olympiakos had a +2 goal victory but an over result, and losing both in admittedly small probability that Ofi score BUT the rather large probability that Olympiakos score say 2 goals to win the game, which is all rather complicated, pointless and a losing proposition. But taking the over as an insurance,a as duck said, would mean that you are counting on Ofi scoring, otherwise your handicap bet on Olympiakos suffices. In this setup, and similar ones, the large handicap and the over are not actually complementary bets, but very similar ones, taking the away the propability that the much weaker team will score gives us the price for the handicap on the better team, slightly more than the over as it should be. So in similar senarios those two can't work to compliment each other, but rather one has to chose if they value the lesser teams chances to score higher than the over would imply and therefore chose to bet it instead of the taking the handicap... Well, it's getting late over here, and I am rambling but I think you get the gist of what I am saying.