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Overall under is also good here, but since it is likely that the winners will be decided early, we will go with the first half under. This Greek team are defensively powerful, but can struggle in offense, and are unable to easily score over 40 in the first half. In the preparation they went over 60 in the first half only against Britain (31-34), mostly because of weak defense, and Britain scored only 17 more points in the second half. That Britain are stronger than Iceland. At the 2015 U18, Greece haven't had a first half over 60 points, and they never scored over 32. There is also a head-to-head against Iceland (31-22, end 63-43). In comparison to that game, Greece are stronger and Iceland weaker. Fasoula brings Greece offensive quality, and a lot in defense.
Iceland's Halfdanardottir and Davidsdottir, who are not here, scored almost 20 per game combined at that championship (Iceland's average at 56), the rest of the team is pretty much the same (no on over 7 pts per game). Even with the two of them they struggled in defense against stronger teams, and I don't think they can handle Greek defense and their team under in halftime is also not a bad choice. However, since they have not conceded a lot at that championship (none over 63, Denmark 55, Romania 63), in combination with their head-to-head and Greece's offensive problems, the overall halftime under is the best option for me.