Remove two random samples for hypothesis.

[drvinceknight]

hypothesis by default randomly samples 200 experiments, as 2 of our
variables have the option of 2 values this is wasted. I've removed them
from the given calls and just included the 4 cases in a loop.

FWIW, I've just run this with and it's passed 5 times in a row and then hypothesis found an actual failing case:

k48r returned -1
...
Falsifying example: test_original_strategy(move_number=159, my_score=0, their_score=0)

That indicates that k48r might do something strange or perhaps it plays in such a way that it knows that it's not possible that move number 159 results in a score pair of 0, 0? (For example perhaps it knows that someone would have defected by move number 159...)