I prepared an improvement and I checked after improvement I win.
I submit improvement and my score is worse than before.
It means my improvement helped in one scenario but is worse in others. How could I easy find a battle which I won without improvement but failed with it?
When you think you improved your code test it before Submit with more different match setup.
Go to the Options tab next to Players and save parameters for different battles with different setup. Then replay those matches against the same enemy AI and evaluate the results (score, steps amount, etc.).
This can show if you make a step back in some situations.