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Error in the video
I'm not sure if it's easy for you to redo the video, or if it's worth doing, but in the doctest for get_moves, Kenneth sets the location as "the lower right corner", (0, 2), and sees that the possible moves are right, up, and down. But since the array is zero-indexed and the dimensions are 2x2, the point (0,2) is actually outside the grid, which is why it says that he can move down. If he'd correctly set the lower right to (0, 1), he would have gotten right and up as the only possible moves.