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A +1.5 spread is commonly seen in baseball betting, the standard runline for MLB. This spread means the underdog must win outright or lose by exactly one run to cover the spread. Alternatively, a -1.5 spread means that the favorite must win by at least two runs. Many baseball games are decided by fewer than two runs.
Specifically, "Over 2" means that the sportsbook is predicting that there will be more than two total goals scored in the game. So, if you were to place a bet on the "Over 2" outcome, you would win if there are three or more goals scored in the game, and lose if there are one or fewer goals scored.