Oh my... yes. I really should have noticed that.
Thanks!

[python 3.6] I cannot make sense of some (~ 2-11) random tests failing.

For example:

# FAILED: 'Draw' should equal 'Red'

moves = ['G_Red', 'G_Yellow', 'B_Red', 'G_Yellow', 'G_Red',
         'B_Yellow', 'B_Red', 'G_Yellow', 'G_Red']

# ...which translates to this grid:
array([['.', '.', '.', '.', '.', '.', 'R'],
       ['.', '.', '.', '.', '.', '.', 'y'],
       ['.', '.', '.', '.', '.', '.', 'R'],
       ['.', 'R', '.', '.', '.', '.', 'y'],
       ['.', 'y', '.', '.', '.', '.', 'y'],
       ['.', 'R', '.', '.', '.', '.', 'R']], dtype=object)

The list of moves was aquired with

def who_is_winner(moves):
  print(moves)
  [...]

O_O

Would have never thought of doing it like that. Thanks for that solution!

Ah, [:k] ... thats beautiful and so readable!

Zunks for zis!