How to calculate in chess? First, let me ask you… How many chess positions can possibly arise on the board? Well, let’s count. White can choose between 20 first moves. Black can reply in 20 different ways too. This already creates 400 possible positions. White’s next turn can increase this number approximately up to 8 000. Black can make, for example, 100 000 from it. Next, it is millions already. Let’s stop here.