For the number of theoretically possible games, including games impossible to play in practice, Tromp and Farnebäck give lower and upper bounds of 101048 and 1010171 respectively.
对于理论上可能的棋局数量，包括在实际中不可能下出的棋局，Tromp和Farnebäck分别给出 10480 的下限和 101710 的上限。