I agree with everything Firo says tactics wise. Mirage is also right about the stats. This means that there are some situations where you know you can break past a player, and others where its a gamble.
Eg Tidus/Datto can easily break Abus/Bickson, but either defender or Graav is risky.
For this reason, only try a risky breakthrough in the first half if it will allow Tidus to shoot close to the goal (you should be practically standing in it!) Even then you might not score (goalie's catch and your shot also randomise 50%), so its best to wait till nearly half-time.
Second half use Jecht/Sphere/Venom shot. With these you can sometimes score from even half-way in opponents half (if you are unblocked and desperate!)
