I had a hard time to understand this so i will try to explain for the poeple, who had a question like me.
results = ['Draw!', 'Player 1 won!', 'Player 2 won!']
the first item in the arrays has index [0], the second has index[0] etc but when its negative its go backwards like
'Player 2 won!' is [-1], 'Player 1 won!' is [-2] and finally 'Draw!' is [-3].
[-0] is same as [0]