This is undoubtedly one of the easiest ways to make your predictions, but probably one of the most effective methods. It is thought that about half of the games in all the leagues end in home wins, another quarter in draws and the rest end in away wins. Therefore, we can conclude that home advantage is real. So having in mind only the home/draw/away results of both sides we can calculate the following probabilities for 1/X/2:
1 = home team home wins + away team away losses / all games (both teams).
X = home team draws + away team draws / all games (both teams).
2 = home team away losses + away team home wins / all games (both teams).
For instance, if we have these teams - Host(6,3,1) and guest(1,4,5) we can calculate the following probabilities:
1 = 6+5 = 11 of 20 games. 11/20 = 55%
X = 3+4 = 7 of 20 games. 7/20 = 35%
2 = 1 + 1 = 2 of 20 games. 2/20 = 10%
Such a logic is included as a part of the forbet algorithm. You can see how even some simple mathematical conclusions can be used in a sophisticated algorithm such as the forbet algorithm.