A bookmaker uses a universal law, math, to make sure he will make a profit at the end of the day. Simplified, what he does: gathers bets, takes his profits, and pays the rest back by the odds. Initial odds he buys from an odds compiler and bettors will adjust these odds when placing bets. Yes, in some cases the bookmaker gets net loss from a game (as they artificially modify the payout ratios), but this is not you beating him.
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