What does a rate of 12 mean? Bet 12 is one of the double-outcome bets. In such a bet, the player will receive a win if the match ends with the victory of one of the teams: either Team 1 or Team 2 (i.e., there will be no draw).
An acca is a group of individual bets brought together in one mega wager. Each leg of your acca, or accumulator, must win in order for you to win the overall bet and get a payout.