Is there a difference between `board[x, y]` and `board[x][y]` in Python?

They’re able to do that since they’re using NumPy, which won’t throw an error on that.

>>> a = np.array([[1,1,1], [1,2,2], [1,2,2]])
>>> a[1,1]
2
>>> # equivalent to
>>> a = [[1,1,1], [1,2,2], [1,2,2]]
>>> a[1][1]
2
>>>