When a chance to score is created, it will either result in a "shot" of your team or a "tackle" of the opposing team.
As such, number of chance created is
YourTotalShots+EnemyTackle
Although not directly recognised by the game, the chance creation ratio is an indication of effectiveness of formation and orders.
Formation counters usually refer to this factor. Usually but not always, a "counter-formation" has significant advantage simply because it produces more chances at the goal.
If this gap is reversed, my team should lose like 0:4 or worse.