There are different types of betting systems, each one with a lot of different variations that the players themselves develop in the process of betting according to their individuals needs. Some of the most popular betting systems are
It is very common that a bookmaker starts its lines with basic coefficients which with time change. This is happening driven by different factors. Sometimes the situation about a certain match is changed: for example a key player gets injured. Or maybe a in-house information appears. Or sometimes the more players starts betting on an outcome the more the sportbook is decreasing the price for it to balance the lines. In any case the outcome with the dropping odds is an attractive opportunity to place a bet.